Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4d6fe1ae91a30f9…

MALICIOUS

PDF

130.7 KB Created: 2021-07-17 13:28:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8efd7216c7c5ec208d3a0512283f080a SHA-1: 2114d9d130e86af7c6341332da17ab4db06c679a SHA-256: b4d6fe1ae91a30f98ee79c60508401d903ebffa9a8b4b7a1d26273e50249da1a
124 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and exhibits characteristics of a link farm, with numerous embedded URLs pointing to potentially compromised websites. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a non-clustered link farm on disposable hosting, suggesting an attempt to obscure the true destination or purpose. The presence of multiple distinct hosts and the structure of the URLs imply a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3103

Heuristics 5

  • 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
  • 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://cdn.eagle.mn/uploads/userfiles/files/garefirovusifixov.pdf In PDF document text
    • https://gencerenerji.com/resimler/files/kagareretupadomoz.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/jhig6hajntsp18rm08hetit39o/rezesodixinogur.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/21803737631.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/f1e696b9eb999e658b300530d967f214/42233588290.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607759686d96b---leviberikodok.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/81842a1268e2a20c3dc17bf34aab1636/nofiwodotuvimonemezo.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/ducpobvj1khphf1jfl4smpj203/56263518701.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b37bc99de2---tazupavefufot.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/c77601794b88c4b4a7677242b357653d/19430370701.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c280c3afc9f---37996611747.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/a48e4b87fd26cb556a9cd0263f0be0cc/84665491163.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/3727073586.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/72816607477.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083d40b21588---83945471406.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/qg90ks9ebikru6hqurv91mijq4/zesiwizenajiw.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160cfb852b2353---tujozikulopagadalal.pdfIn PDF document text
    • http://daehwa.info/uploaded/file/jakuxixivakiza.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/lpva8to1ubdl6eb1idchsrffbt/tovapexexesenuwipumituk.pdfIn PDF document text
    • http://kgmda.com/upload/files/4997115811.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ab350353869---basapudavatokesorakud.pdfIn PDF document text
    • https://netiko.ge/img/Data/file/39818591189.pdfIn PDF document text
    • http://medicare-darmstadt.de/bilder/UserImages/file/20588628683.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/2f138a612fe0fffe9ce8f944b77f4402/77019834844.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=working+memory+and+attentionPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001b89a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B89A 18576 bytes
SHA-256: 637359d7edc4ccf764af5e710453779e1adcc8e2c428c85b244a65ff13511f0a
font_01_sfnt_off0001e8b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E8B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1