Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fbfbf9119700170…

MALICIOUS

PDF

91.8 KB Created: 2021-06-13 08:28:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f72276372384da1cb7e0d55cb1e8d944 SHA-1: 27482ab851bb5e79ad97a7be582b93ab6948fb36 SHA-256: 6fbfbf9119700170e2ecbbb403c47b70937b31c6b824f4441f3bcb45fd72ffdd
164 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It functions as a link farm, containing numerous URLs that point to compromised websites and potentially malicious content. The presence of external URIs and link farm heuristics indicates an attempt to redirect users to attacker-controlled infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://inwebjor.ru/uplcv?utm_term=call+of+cthulhu+rpg+system
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/3s9tubekjdm8qk2h29n43jh7qg/20704907383.pdf
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/nt0vi6arsljdikacuvmssmudc1/96568474142.pdf
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/5d18ae14777152377ef3089466efb900/41033046193.pdf
    • http://esoftland.com/userfiles/file/23486799564.pdf
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/rsh9i5567m8a7qj3sp401vf8nr/27988719324.pdf
    • http://activesolutionelectric.com/images/file/vofuw.pdf
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/d4oia60rm6ran8v7k07iqee6b7/jomugixofi.pdf
    • http://adabaskimerkezi.com/upload/file/jagiwanukelanubiwebu.pdf
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608f349507cd1---1002130359.pdf
    • https://dubaimotorcycletours.com/uploaded_images/files/pifazatudekiturenokujifot.pdf
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/uv7av5far091olgtf6mqrn0oh2/matizekuw.pdf
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/chnql0bhp1eo0bm1qbabogkkr4/13414859691.pdf
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef2566dbb1---37646961402.pdf
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/f95b9782836497e2eacc691e156234e1/79677018622.pdf
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc54010c30---97656471427.pdf
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/047175414a1a04f07d2fc47faa8d6ef4/gezisotuxigomulilono.pdf
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa7822d354---zigukaweda.pdf
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/1e1c16a5bbf475fa0ccb6049a6fc3571/18163619606.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001252c.bin
0bceffde1eed4892f9972e5ccc110cdc9eb7777205f74a62b56a62887f0be438
pdf-font-stream PDF embedded font (sfnt) at offset 0x1252C 5436 bytes
font_01_sfnt_off0001378d.bin
27c4e87d7c95615c9b2ec97679a9401619913313cf2a957c4804a56c57c116f3
pdf-font-stream PDF embedded font (sfnt) at offset 0x1378D 12452 bytes