Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fb4919dc2c05e63…

MALICIOUS

PDF

86.0 KB Created: 2021-08-18 15:51:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 487b6f10d424ef35c14686df6603a942 SHA-1: 63b4c57bb99f46e37618cdef9178117ac97ce0da SHA-256: 2fb4919dc2c05e6303de3999bcce6c156f048aa6d823b0c71032261cbf73c4f6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the nature of the link farm and the presence of external URIs suggest potential for further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://smidgel.ru/uplcv?utm_term=bissell+proheat+pet+upright+carpet+cleaner+1799+manual PDF link annotation
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a8325e6408a---39991869806.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/03c456b0ce76f9fb97fa2567de162c30/20482245484.pdfIn PDF document text
    • https://ivanamihic.com//files/virarerovegorabo.pdfIn PDF document text
    • http://mientaytourist.com/uploads/files/68631595004.pdfIn PDF document text
    • http://rockfordauburn1966.com/clients/8/85/8549db0cc7d1f63cce07d3be93bd6f3d/File/66852932667.pdfIn PDF document text
    • http://thanhnhomdinhhinh.net/uploads/files/finepulixoselakuvo.pdfIn PDF document text
    • https://tangente-mag.com/img/file/56273005564.pdfIn PDF document text
    • http://muaah.ca/userfiles/files/lotalajil.pdfIn PDF document text
    • https://holyfamilyhospitals.com/ckfinder/userfiles/files/37430766575.pdfIn PDF document text
    • http://taskentcompany.com/userfiles/file/38013982410.pdfIn PDF document text
    • http://x04ydivan.ru/userfiles/file/91173624353.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/wurusosuladotalenujol.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160781762bd0f5---78007510940.pdfIn PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/49358201509.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b7344d984d---gigiruziwitebule.pdfIn PDF document text
    • http://miracleschoolministries.com/survey/userfiles/files/71013037077.pdfIn PDF document text
    • http://jarosi.hu/files/file/sumile.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/f0c9a4047fb77fdfb3b6634b57cb5614/42390102542.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/fdf417054e9f25343eaaeb13ae2b2dc1/387861644.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a5d86da75f2---65515965855.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/qnsni0978l3j2gqd4ftghe4898/jumuxutasafizevibawuzevan.pdfIn PDF document text
    • http://paoladebenedetti.eu/userfiles/files/40182500405.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160dde414adef5---31764012369.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/userfiles/file/42544787778.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_off0000eb8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB8D 16584 bytes
SHA-256: cd8f3a6465230cf9cbf95050ab14ebedde1dad9e007b551e34c1c35c25e6d1e7
font_01_sfnt_off00011691.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11691 11244 bytes
SHA-256: 9496503bb3ddfd28eca65213bbbb126815d1c5330897d38b67996c3bcf72085c
font_02_sfnt_off000130e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1