Malicious PDF — malware analysis report

Static analysis result for SHA-256 d85f12f85cd52d77…

MALICIOUS

PDF

141.8 KB Created: 2021-08-11 05:28:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 72d0616f8f87b682b9af04c1c1144198 SHA-1: 8fcba0262be9e94d447d407e71c295977cb1a65a SHA-256: d85f12f85cd52d77a8e6f6b0bb49cce86a13d89719fea5391ed58bf11297dab8
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://gea99.com/ckfinder/userfiles/files/jokexabogorogakosizegile.pdf In PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/f365ff2bac62a8ed5d036c5413bfcbe4/21910523189.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee61e46d7a---12948253556.pdfIn PDF document text
    • https://dovolena-jiznicechy.cz/uploads/romagibimewodawuvabefoni.pdfIn PDF document text
    • http://bukhatirhomes.com/userfiles/file/sugamunurazalopekume.pdfIn PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/zojepas.pdfIn PDF document text
    • https://solidpractise.com/files/userfiles/file/xuluwiwebilofoz.pdfIn PDF document text
    • http://nipissing-lodge.com/clients/b/be/be32fa5c9d1e5a871f1efa0d35b29fe7/File/55078741841.pdfIn PDF document text
    • http://www.kotolantopeni.cz/files/86575717158.pdfIn PDF document text
    • http://educationexplosion.com/clients/a/aa/aae59ec6301d25964842a0067e0ae100/File/27057931784.pdfIn PDF document text
    • https://ijmscr.com/ckfinder/userfiles/files/wojeruwarazorujopew.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/69766306241.pdfIn PDF document text
    • http://chinawin-consult.com/userfiles/domawagetokegowonewumula.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad05de8e911---8711948250.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fdf659ccba---worotubixuvip.pdfIn PDF document text
    • https://btsis.com/upload/ckfinder/files/52252157024.pdfIn PDF document text
    • https://doublehaircenter.com/upload/ckfinder/files/31440022227.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b1d46dc887c---kevekanijupewixukida.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/jcpn0mhraipm6i1foqnmoir86t/xefirovajala.pdfIn PDF document text
    • http://daoltrading.com/userData/board/file/zekibokigewi.pdfIn PDF document text
    • http://janatalnajaf.com/basefile/janatalnajafcom/files/vilib.pdfIn PDF document text
    • http://okulsanmalatya.com/imgup/file/3122635191.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=caballeros+del+zodiaco+las+12+casas+capitulo+1+espa%C3%B1ol+latinoPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001b7a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B7A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001cfb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CFB3 19400 bytes
SHA-256: 5d9b71ac629d1fe89d83a2a378f6c498d70d52601b6fa7fc2f346b1b434876a7
font_02_sfnt_off000200ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x200AE 11216 bytes
SHA-256: d5b65ec2e151fa06c28b43974a8ba39e01e8133203bc00338da473e43eefeb61
font_03_sfnt_off00021ab6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21AB6 2460 bytes
SHA-256: 0eb558be76c6945c76535d455c024d5d16115188f93990cd829b7f9041bd7e02

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