Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc26d6aac3bd84f2…

MALICIOUS

PDF

69.9 KB Created: 2021-09-27 22:11:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: b4531d245b1aecf6581f3fa6a5caf270 SHA-1: 7eb28aba87b0d4f6798088c9ac890052508f0469 SHA-256: fc26d6aac3bd84f2750a8615a10cc907bcbc6e5a09c65c2419df380a952dc904
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of embedded URLs, many of which point to compromised CMS upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. The file's structure suggests it's designed to obscure its malicious purpose by presenting a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://matchonusa.com/uploads/files/51135618199.pdf In PDF document text
    • http://atrsara.ir/resource/files/bolen.pdfIn PDF document text
    • https://vatlieutaphu.com/upload/files/laluvujox.pdfIn PDF document text
    • http://clinicaveterinariaalbese.eu/userfiles/files/13815291832.pdfIn PDF document text
    • http://cichanski.com/Upload/file/30117472863.pdfIn PDF document text
    • http://longbeach.ilovepokebar.com/uploads/files/80939360695.pdfIn PDF document text
    • https://mimpiindah2.com/contents/files/6146268584.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/0l9henm27flbve7jndbb5t2suc/pagodamilebovodibak.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/57204077490.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/befeleku.pdfIn PDF document text
    • https://pisausakti.com/contents/files/3845238872.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/rexewijakew.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16141a0b2e0793---28955100241.pdfIn PDF document text
    • https://tierlistei.ch/downloads/repisenuli.pdfIn PDF document text
    • http://pengyou-english.com/FileData/ckfinder/files/20210918_5F48B046CE841406.pdfIn PDF document text
    • https://gentrilieu.vn/userfiles/file/19590124471.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/sajiraxolubavo.pdfIn PDF document text
    • https://apotekatia.ba/fajlovi/mexopo.pdfIn PDF document text
    • http://chafewyuok.handysociality.com/upload/files/mutute.pdfIn PDF document text
    • http://www.pethouse.es/ckfinder/userfiles/files/velikokob.pdfIn PDF document text
    • https://brazilairporttransfers.com/ckfinder/userfiles/files/fotazuzelesagimov.pdfIn PDF document text
    • http://antichigelsi.it/userfiles/files/mototavuwe.pdfIn PDF document text
    • https://fanaf.com/article_ressources/file/powovanafekimogifuginanu.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613666c52caa6---75184505155.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=sabse+number+one+gamePDF 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_off0000b024.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB024 10528 bytes
SHA-256: a2de1c43d326e4c71e9e970db5ca9e532abac2c502498c58bb0af6aabf9406e4
font_01_sfnt_off0000c814.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC814 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e026.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE026 16664 bytes
SHA-256: 9f562e339454968c39c227a9cd376cb55825b12854dfa41bca7f244b63b5c1b8