Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c1a07aaac147298…

MALICIOUS

PDF

86.7 KB Created: 2021-09-02 14:05:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 85e2179857062e8a7c18ff4339b60454 SHA-1: 06a1ce95dda399ef93fe0fa75e793b7eaec24bae SHA-256: 8c1a07aaac147298b9340b00cfe4d32b0c9b7f3c08243e092a04a7ca9da1e6cc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high probability of malicious intent. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of these links and the overall structure align with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://garglob.ru/uplcv?utm_term=definition+of+african+traditional+education+pdf PDF link annotation
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/1bad1ee082463e34154627fd83141ac7/56148046223.pdfIn PDF document text
    • http://passaicvalleyclassof1957.com/clients/44362/File/dowukozup.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/ratuw.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eff84d1ff1---puxofol.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/13678926803.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/38bff57ceff7233cfafc071c92a99ff3/dawozuveno.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/5daab8a6632540771bd83564bb5ee8c6/50019523239.pdfIn PDF document text
    • http://khaskhaan.mn/uploads/userfiles/files/4587409826.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/74e22de0f3fe5bfeeb38f3e05a391f71/42609548757.pdfIn PDF document text
    • http://ewhamd.net/upFiles/ckeditor/files/tamopopejoritabi.pdfIn PDF document text
    • http://cl-pub.com/files/files/pupatifuguwebamiv.pdfIn PDF document text
    • http://pogservice.ru/userfiles/file/madikuwovuwivibagava.pdfIn PDF document text
    • http://lideparts.com/userfiles/file/1623457974.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/kinorev.pdfIn PDF document text
    • http://uctodane.cz/UserFiles/File/567248616.pdfIn PDF document text
    • http://inezorviskids.com/clients/37546/File/49330418695.pdfIn PDF document text
    • http://lucchetta.net/userfiles/files/70834830658.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/1c702482401d0ceb0610813fd3370651/86874216797.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c89e9b5f822---lewumotadorigonuluxaxixu.pdfIn PDF document text
    • http://mkpstroitel.ru/upload/files/mixuzu.pdfIn PDF document text
    • http://cantinachitarra.it/userfiles/file/gagisadifo.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_off0000ee25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE25 10548 bytes
SHA-256: a4b9862b66747e1cacfecfe97265eb4744c86948cfefe71e9c7f0f5a5c4b8f4c
font_01_sfnt_off00010642.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10642 18120 bytes
SHA-256: 01315f9fda08190a22077ab291067dfde087fb274b41ef02a05c483d4ff74389
font_02_sfnt_off0001353b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1353B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1