Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7c5cb2b17372509…

MALICIOUS

PDF

85.2 KB Created: 2021-09-22 09:25:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c80cc2cb10ede19e7b000578eef75c94 SHA-1: b1d484fb76f750981730590fe3d8b9da967a68e3 SHA-256: d7c5cb2b173725090bf3c87e42c32b9a42aa67c37ce9e1b2f4510ef59712aa5f
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. Heuristics indicate a 'download button' lure and a 'callback lure', consistent with phishing or scam attempts. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the exploitation of PDF vulnerabilities to execute further malicious code or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://cructi.ru/uplcv?utm_term=download+roblox+mod+menu+android PDF link annotation
    • http://shoreluxurylimos.com/userfiles/files/17807609325.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/25747595576.pdfIn PDF document text
    • https://ylwlgwadmin.ylwl.cn/upload/files/dezabuve.pdfIn PDF document text
    • http://pro-group.ru/userfiles/file/23741721345.pdfIn PDF document text
    • https://zilalcooling.com/other_files/File/17512306330.pdfIn PDF document text
    • http://isvpro.com/custom/files/jadekoduja.pdfIn PDF document text
    • https://global-product.org/CKEdit/upload/files/4332410943.pdfIn PDF document text
    • http://centonze-vini.com/userfiles/files/60310648743.pdfIn PDF document text
    • https://cornwallstaffagency.com/userfiles/file/72434797919.pdfIn PDF document text
    • http://metalzilembo.it/userfiles/files/gikuxomemoxoto.pdfIn PDF document text
    • http://allgeology.ru/ckfinder/userfiles/files/95992278428.pdfIn PDF document text
    • http://leadingedgecorporate.com/user_images/file/43794532881.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1bb667db2---wezul.pdfIn PDF document text
    • https://moveo-sport.pl/userfiles/file/ribufajisadamom.pdfIn PDF document text
    • http://tomgiongvip.com/uploads/files/file/44913390268.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613ee0efce4c4---dejadinelanonovaj.pdfIn PDF document text
    • http://xinyaoqiye.com/upload_fck/file/2021-9-12/20210912190542637552.pdfIn PDF document text
    • http://kcpsystem.com/userData/board/file/90883481192.pdfIn PDF document text
    • https://khmernative-rice.com/userfiles/file/nupajuz.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161443bdab4f84---sukibifopitif.pdfIn PDF document text
    • https://hirurgija.me/files/mijigajusogin.pdfIn PDF document text
    • http://www.serenissimaservizi.com/files/67701727961.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133344e9f81f---37865284027.pdfIn PDF document text
    • https://rozynoklinika.lt/userfiles/file/muzozagalanaf.pdfIn PDF document text
    • 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_off0000e801.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE801 10572 bytes
SHA-256: 5493809bc3cc4b4445d80c956bc6319cf7eaf2a639e64885f6124396bd2ac967
font_01_sfnt_off00010014.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10014 17768 bytes
SHA-256: ad5c86816b8049340582e204d6a8635bd7708cd67c88c48db3fc68d270832cd7
font_02_sfnt_off00012ebb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EBB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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