Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b66502fee426cd0…

MALICIOUS

PDF

73.3 KB Created: 2021-06-25 12:52:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ee965211eed519cc57019cb3221827af SHA-1: 3b4d426d4258f915ac990c6f7dad40a92d273ff1 SHA-256: 6b66502fee426cd01597bf87f1bb8c1e2e86d4a7465d15a076d808af84c5ae35
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm hosted on compromised WordPress sites, suggesting a phishing or redirection attempt. Although no scripts were explicitly extracted, the nature of the links and the detection suggest it's designed to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080b5043c148---37565322794.pdf
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/jft6403oqi6tdl8fqv165qnpus/xuradule.pdf
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160763eacd11b9---kazokogexukosavuvajovoxik.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/5b1bb43454c89e50286a1649728aefdd/29799380400.pdf
    • http://bjhtdszdh.com/v15/Upload/file/20215211047365987.pdf
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/783951591088790796706324e5f73c79/lateludaxorajetasi.pdf
    • http://www.asslar.de/downloads/61280505827.pdf
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1018b1a846---jobekis.pdf
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/01f5d1086e554af780145858912ec75d/pexemowodoni.pdf
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/3e4cd7dd2cd886991e59af838e5833a5/42655954609.pdf
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/deceab55681f9680829cf9cf699a104a/52211832384.pdf
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16098796e1ea55---nujoxufetakodusozoguxixat.pdf
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160940bb1de416---20218242888.pdf
    • https://armagedonspedycja.pl/files/file/giwudatesal.pdf
    • http://digitalpolicycouncil.com/imagenes/file/salexabadilunonuruto.pdf
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/33934b4ae35ffd56587acb57aeeaaeab/64111502244.pdf
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608ddfe993427---tiliduzobelamemitobip.pdf
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160986f708f525---tabotaxufed.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=country+by+shape+quiz
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bcb3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBCB3 16792 bytes
font_01_sfnt_off0000d4c5.bin
ddc63462956be8f8ab9517fc502ca245532f755a05024cafa4da74e272009daf
pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C5 16540 bytes
font_02_sfnt_off0000ff89.bin
409753e40e0542d2549865a1f223d550e425f7219c463185e88ad803202ebdd0
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF89 10896 bytes