Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c3b6f625661186a…

MALICIOUS

PDF

89.9 KB Created: 2021-07-09 14:42:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: af8fa7aa8faf16769edfde4e791f66e0 SHA-1: b042045cd6f9be19dc0773dc2b12151fdc39c9b9 SHA-256: 9c3b6f625661186a2c5170d9dc53f41484ad6aad427fd361d5b9ec554a0ccbed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing or trojan delivery mechanism. It contains numerous links to external websites, many hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the nature of the PDF and its embedded links strongly indicate an attempt to lead the user to a phishing site or download a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://ketchas.ru/uplcv?utm_term=love+is+an+illusion+chapter+31 PDF link annotation
    • https://la-klamm.org/Files/files/8160539903.pdfIn PDF document text
    • http://taiwan-casters.com/userfiles/file/vunig.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160777b6936b32---todalezipividazelegawuva.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160d353771dc57---koduzesikegugodomivinude.pdfIn PDF document text
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/zoxuvokonebiwar.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/2f5qn0l6tu1n46jhqbtqpbnasc/47095059421.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/160897cf07d782---87469630341.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608f4923005c2---ropakarinikiv.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///2021051711848_243374622.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/8q1u05n426m6c3p2rf0t5if4bu/gevufo.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/0d63c0f8e7a8eef2fb261b77f29691cb/gurisiwifidusofa.pdfIn PDF document text
    • http://parkwaywest1974.com/clients/861606/File/12377804911.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/vexufadurew.pdfIn PDF document text
    • http://abroadster.com/files/70105865750.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/76787bdca1d4272c7d6e3a97e3f449fe/xebapinadawo.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/eeca99ef80d7feedadb9886482a251f9/23955701170.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/jkrhlo73b06bs83bn2crko8m0u/57080103478.pdfIn PDF document text
    • http://tiramisu-o.com/yamituki-n/uploads/files/rugelupobutukobofiguk.pdfIn PDF document text
    • http://canxetaidientu.com/images/file/74151020562.pdfIn PDF document text
    • http://vinmexindia.com/uploads/41506561187.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/gj74bd177i4iotbev4f210gsti/13880532734.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/11807964041.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b8074425e7f---kefujoritojujekabuzumev.pdfIn PDF document text
    • https://blogsma.com/files/nufofotutuv.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_off0000fc24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11436 16864 bytes
SHA-256: 97362a50ce2d438a856419d5a224663fc5ecfe12c123459f563dd65f0b055b96
font_02_sfnt_off00013fbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FBD 10816 bytes
SHA-256: 143f90c6ac2f4120b495a0b35b44c9aa5d8757f0b9a24b446e5369ee4ed6fe5b