Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a13729f3d7110d3…

MALICIOUS

PDF

78.3 KB Created: 2021-06-13 19:01:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 97afd49956468349b07f6ab75c3f30ac SHA-1: a3a5146a21d8842a9cc8fcec93b4cd8eb59fb898 SHA-256: 0a13729f3d7110d3a8025463df76350dc0fae7cc996638f91664c9d6b0aac3c1
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing or trojan distribution. It functions as a link farm, directing users to various compromised websites and potentially malicious downloads, as indicated by the numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic. The presence of embedded URLs and the overall structure suggest an attempt to trick users into downloading further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://krisoc.ru/uplcv?utm_term=pes+2012+mod+2017+apk PDF link annotation
    • https://motelandratecuci.ro/userfiles/file/lodakuvuvofagebiz.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d57df028b---netixoti.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609982ddf2eb6---5136085126.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b845ce3f49c---fobowejaxuserapixiwur.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/869d8605b534d4aef545ced71f9d7f05/88281355821.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8fe67ec8f---32170062622.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/3bhlcj0j3gdfdkkd04jo0c9vh1/bipapagagu.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa0d366e15---nezigosuxoxofubirug.pdfIn PDF document text
    • http://fobosgrunt.ru/files/ckfinder/files/18813951297.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d988d6b7b0---93003018369.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/3914134856352d5446d198f8dd4f1ab7/wizezeniba.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/82213408386.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/6f3034d65c1a6c207f80e98f210ee799/51057670987.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3CB 5448 bytes
SHA-256: 67e45347035bdbbe19bd7680e3363a4b983f9d9c3730abcb51ba502a2da99d03
font_01_sfnt_off0000e651.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE651 1728 bytes
SHA-256: a7921e1f22a3b9f131f1d26e0a30b1579b95f06bc21b675b004e759a1faecb7f
font_02_sfnt_off0000eeec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEEC 12116 bytes
SHA-256: 797105b0c92dc53ddccf8392ecaf342814e05730f86d0c48bfe6181e1e8a46f5
font_03_sfnt_off0001157a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1157A 16084 bytes
SHA-256: ce90dcb8f80a691a226d66d7b9fb40db13b52946125f6d312f8860abae454107