Malicious PDF — malware analysis report

Static analysis result for SHA-256 a771b82985408516…

MALICIOUS

PDF

91.2 KB Created: 2021-07-23 16:53:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 76ac546581d8be51bd063cade8356b2e SHA-1: 0d10fe042a7b87a09fe43a1887bdba53fe4b7884 SHA-256: a771b82985408516060429dabc7cdbf1b1c18e4bfc3eddacefaf679c3603aae8
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to potentially compromised WordPress sites and disposable hosting. The embedded URLs suggest an attempt to direct users to external, malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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.
  • 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://autopratichesas.it/file/voxidow.pdf In PDF document text
    • http://kristenpell.com/userfiles/files/diwapaxinamotaxabepaze.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f27958538aa---22337872337.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/27382392781.pdfIn PDF document text
    • http://gerd-pollak.de/userfiles/file/97566446085.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160c06b5d570d0---313159095.pdfIn PDF document text
    • http://fittbike.hu/files/file/xaxadupifepesit.pdfIn PDF document text
    • https://ntct-dz.com/ckfinder/userfiles/files/94177097960.pdfIn PDF document text
    • https://bestwaynepaltrek.com/ckfinder/userfiles/files/96370241491.pdfIn PDF document text
    • http://rjt1.org/upload/files/760283609.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/zamamavotuturatemulurimof.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608003c392d01---91031119307.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2a9be26f22---42814608850.pdfIn PDF document text
    • http://transsnabstroy.com/userfiles/file/43703686944.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/rizegukofibesatotopapopox.pdfIn PDF document text
    • http://cuatudongsaigon.vn/uploads/files/53958580275.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d276235e09---10970413613.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/97c302fa2b7632d06effa1699f539f67/gewuxoxuwafateloxabobe.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/eb8c8fbf0684721673c8d7e69155eeb4/5981065072.pdfIn PDF document text
    • http://bronia.org/userfiles/file/96609933657.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/niredanedozilevibiwe.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/dopilm9l2hvvnfk2i4alevp91j/24401999987.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/b0a9102a9cc196778c8191cf44726a1f/34138884197.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/c71a8b1968725e8a3b4ec8adbce952db/82153070252.pdfIn PDF document text
    • http://ongnuocdenhat.com/upload/files/48196588730.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+stop+asb+loanPDF 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_off0000fefc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEFC 18396 bytes
SHA-256: 3d5ba2c36d058e5fe8da5f27a8e15f8aabd66f997a58773ee2ebd214d82dc911
font_01_sfnt_off00013028.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13028 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001483f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1483F 10140 bytes
SHA-256: 2ca28afcc51a38ff990569eeb436853c8aae5d76255b5bfe00edd807c3a32e66