Malicious PDF — malware analysis report

Static analysis result for SHA-256 6012dc879511b4d6…

MALICIOUS

PDF

88.3 KB Created: 2021-07-24 02:44:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7ddb9a0dc16b5e07cf4b5a4df51092f0 SHA-1: 783e9fb6990553617ab1f62f79e8a2cd11b41788 SHA-256: 6012dc879511b4d67620ee355b1df85fbb73c8b316ed1be800704ca647ff9c5f
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file exhibits multiple indicators of malicious activity, including ML classification, ClamAV detection as a phishing trojan, and heuristics flagging it as a link farm pointing to compromised CMS uploads. The document impersonates Microsoft, attempting to trick users into clicking links that likely lead to the download of a second-stage payload. The presence of embedded URLs and the nature of the heuristics strongly suggest a phishing and malware delivery campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=halo+download+unblocked+weebly.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://juniorclublivorno.com/sitonews/images_upload/files/96817545403.pdf In PDF document text
    • http://wabasnb.com/files/fckeditor/file/150266070960c429bce6793.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b25e57ca857---mutap.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/93768e002a9c986ae5e909fc4b8970d7/54647033730.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/wijixobe.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfed857ab4f---neruke.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f410bf2ff5e---gexutonadezewuwoz.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/1319bacb059d9b94fae81f16fbd070bb/19697941811.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/o2ahu7lcf4cg9u3of1cpi7ep00/39330955831.pdfIn PDF document text
    • http://gidaero.com/upload/fckeditor/file/dilokebetamubax.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/g8lqul0iidn67emn9pjfshm5s3/malebi.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/ljff5uh7r9ksfcjgb2lf61mkk7/72218813344.pdfIn PDF document text
    • https://tectrongim.com/uploads/files/47361013419.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/df35b7f2a8b016b5cc9fd5e39e8efa86/49325947458.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/f2kcgotf86rj2d0s169gbf1lpk/72682047498.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/38820166006.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099ddac6a797---tuzipaligarufatamone.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/609fd6778f581f247455d94b4d3c035b/kerozutukabi.pdfIn PDF document text
    • http://anupbolivia.com/images/files/32674216083.pdfIn PDF document text
    • https://aksukartela.com/images_upload/files/1013415628.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/28341520267.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b2b19ccd238---18160647329.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7db34210f4---gokivizomekitufomomujogol.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/f1201edb8c6195e44687994990f0df83/34006070925.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=halo+download+unblocked+weeblyPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f541.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF541 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010d58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D58 10428 bytes
SHA-256: e2f8a9292bf357c0ba9dc75cfff2d2823b6bc2e91c4cde4d008a1f611dd85f61
font_02_sfnt_off00012519.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12519 17628 bytes
SHA-256: a6b6049a2083b39534f3ee839c3e55099537c2dc64e938def64ec1764e0af4f6

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