Malicious PDF — malware analysis report

Static analysis result for SHA-256 4074a80f11e91f4f…

MALICIOUS

PDF

83.7 KB Created: 2021-08-29 23:45:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6b454fc5a43ae026fd61851e8f2838bb SHA-1: 5d3c15427f64ea19c927f7269fb4b36c1b4d171f SHA-256: 4074a80f11e91f4f5602880cd00f9fb6778da46df8957d7086640441ddcabab8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was flagged by a machine learning classifier and ClamAV as malicious, indicating it is likely a phishing or trojan delivery mechanism. The heuristics reveal a link farm pointing to compromised WordPress upload storage, suggesting the PDF's primary purpose is to redirect users to malicious content hosted on these sites. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with attempts to trick users into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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 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://afayl.com/userfiles/file/10059239239.pdf In PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e87b3ea4b63---57753113083.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fedca9ad98---28475860265.pdfIn PDF document text
    • http://bwc.lt/i/zaxenozavikofuzu.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/forilol.pdfIn PDF document text
    • https://churchboys.org/userfiles/files/sepuvudededoxaw.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160920769edd53---roxawulabe.pdfIn PDF document text
    • https://isagrinio.gr/userfiles/93889161805.pdfIn PDF document text
    • https://hchoanglong.vn/userfiles/file/rirevulosaveguwo.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/nunifikijomatura.pdfIn PDF document text
    • http://nfc-lampang.com/user_img/files/94380545358.pdfIn PDF document text
    • http://rpsbchamber.org/editorData/file/gitorezonisoza.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/xurujobilanu.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160978df3cf473---16713820914.pdfIn PDF document text
    • http://4bx.pl/public/file/dejitorijovazixexidif.pdfIn PDF document text
    • https://larioenergy.net/uploads/file/89507120588.pdfIn PDF document text
    • http://k1a.ru/images/files/file/89417975477.pdfIn PDF document text
    • https://dobre-akce.cz/media/files/file/gogigafizagoku.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160868db4e2cb9---gotadeperegudowobo.pdfIn PDF document text
    • http://ilovehikari.com/uploads/files/maxolidumamokevanag.pdfIn PDF document text
    • http://kunmobile.vn/files/uploaded/20210801/file/29836048133.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160d32729d1062---55122777361.pdfIn PDF document text
    • http://www.pics4us.de/userfiles/file/72003791789.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=logistics+manager+resume+word+format+free+downloadPDF 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_off0000e16c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE16C 10960 bytes
SHA-256: d1d6881b2f21e2e8244300dedf78a08fdda560ce8a6c8558742d91e7fbcbe604
font_01_sfnt_off0000fab0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB0 17456 bytes
SHA-256: 595675cbf176885a69f6f382330843e720dcadf24085dac3e02b5cf3f7f59b1a
font_02_sfnt_off0001284e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1284E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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