Malicious PDF — malware analysis report

Static analysis result for SHA-256 03c2305bd5af2463…

MALICIOUS

PDF

77.0 KB Created: 2021-09-15 19:59:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b879472ca444ba6281f77404db13d1fb SHA-1: 95e7f535c66e7b8f0a0fc478f083e9c9c7f87fb4 SHA-256: 03c2305bd5af24637b8bc8ef1e7475a2aea1b3fc737047de9c9ccea0e73a537b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised or disposable domains, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. While no scripts were explicitly extracted, the presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics, along with the ML and AV detections, supports a high confidence assessment of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://pixomot.ru/uplcv?utm_term=javascript+hex+to+number PDF link annotation
    • https://vanphongphamhienluong.com/upload/files/zalowul.pdfIn PDF document text
    • http://jimsclub.net/new/board/img_tinfo/file/20210905213847.pdfIn PDF document text
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/goduzizupipusozazufap.pdfIn PDF document text
    • http://canoeing.by/pics/files/dalunuxuvugawasemas.pdfIn PDF document text
    • http://www.iuoelocal870.com/kaizen/ckfinder/userfiles/files/jotodonosatafi.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/5039949542.pdfIn PDF document text
    • https://bharatceramics.in/ckfinder/userfiles/files/55201933053.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/7f8d2ce17ebb83dfcf8b88c824ea8a74/xesemesuzebukalaz.pdfIn PDF document text
    • http://quincy.pl/ckfinder/userfiles/files/leluvoxijizedugatumage.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/2399903155.pdfIn PDF document text
    • https://nyirfa.hu/uploads/files/28699896027.pdfIn PDF document text
    • https://mihalex.by/files/files/jigurinu.pdfIn PDF document text
    • https://immobiliareincentro.it/allegati/file/radorusager.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613007d6ea95c---napeluduzoderegugidisegud.pdfIn PDF document text
    • https://rajaunited.com/contents/files/65949525364.pdfIn PDF document text
    • http://kd-council.com/upfile/files/45943640891.pdfIn PDF document text
    • http://lblussana.it/images/file/pegosazuwazogebex.pdfIn PDF document text
    • http://johnmichaelharrisonlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/1631937400.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/858fe836b5bf315556d573904d14d879/warapesilagapesorabomirop.pdfIn PDF document text
    • http://steinemann-ag.ru/fobozo.pdfIn PDF document text
    • http://abaj.cz/UserFiles/File/91401601865.pdfIn PDF document text
    • http://konditsionery-odincovo.ru/upload_picture/file/42841483924.pdfIn PDF document text
    • http://zimmerei-possert.at/3651476216.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_off0000c569.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC569 18396 bytes
SHA-256: 899b9b5b6a8c867f15f20b89cd99675fe3a6996cf1ff56bd3f401df3b565aa78
font_01_sfnt_off0000f52a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF52A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D41 10992 bytes
SHA-256: e93dc625f377c3d499363d8fedaa6328e731cd6c04bdff196196a060513dd990