Malicious PDF — malware analysis report

Static analysis result for SHA-256 a85bc2b864f508dd…

MALICIOUS

PDF

82.6 KB Created: 2021-06-26 05:31:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f0db5f5f78a405cbf8c58189e11d0abb SHA-1: e28057e761ce236a1724328ee1140ac263c111fc SHA-256: a85bc2b864f508dd14c08cb29dee8ce614ad3fe53c0fdbea4c9fee17c244cc66
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. 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. The document body is heavily obfuscated and unreadable, but the presence of many URLs indicates an attempt to lead the user to a harmful destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cructi.ru/uplcv?utm_term=chips+in+pitta
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/45182818913.pdf
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/eb1df1565b7433380866ee9c77d23c65/koxitox.pdf
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c32bc69bf56---93794228219.pdf
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c319a8d390---fabagabalirumex.pdf
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a282b690a26---78259440190.pdf
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/c88f76e0819680eb8f40fe70ca0c8fa5/83910776738.pdf
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/2c78f8cd9574db938ad6c406357585a6/jelizixup.pdf
    • https://nhachoxebus.com/upload/fck/file/69714650278.pdf
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba126e163ad---61391308862.pdf
    • http://vorne-sitzen.eu/pcms/content/file/85698310401.pdf
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/f824bb7602ac99757aed1c1022b4bdaa/zivesitavejoni.pdf
    • http://alibabashipping.com/userfiles/file/vezuripowupubas.pdf
    • https://batikatravels.com/userfiles/file/kefazumadugud.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/55e31c6d560d2c394e30fec840346852/sitenuzoragagu.pdf
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160959cce15d74---83122197487.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/3c12a007f5d97479f5d65f4da50ae570/ladapesokedoxeg.pdf
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/d725fc8b9fe699ea7ec48cb5bee0f4ea/ponikonajoxekori.pdf
    • https://diphong.com/uploads/42383931084.pdf
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/47f6bd90c3e64265e710fafcd86550d4/jariwozogug.pdf
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/6ogbcl4dqrgnfs22ct7ehcatta/jefoladejumikokadop.pdf
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/7af4a360838a9fb783bf4c78a489dc45/lidanototokonob.pdf
    • http://xn----7sbakn3aoflleitf3m6a.xn--p1ai/userfiles/file/kitemakaje.pdf
    • http://ketoanaca.com/uploads/image/files/18312752944.pdf
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/p6av4us7n3a365l8rrebh3ni70/94101339563.pdf
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/9tuoetts2070vo5e5s066pegic/38608114289.pdf
    • http://abacusnancy.com/userfiles/file/66683772224.pdf
    • 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_off0000e06e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE06E 16792 bytes
font_01_sfnt_off0000f884.bin
66e4833d87a48317c505d631a7097a5c485628a961be7b63f0022e31f40aa87b
pdf-font-stream PDF embedded font (sfnt) at offset 0xF884 9984 bytes
font_02_sfnt_off00010e96.bin
e45b71e36a66836000e1413a6974c6daba9c98bd8cd7189ecb2b650ac5a0bf8d
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E96 17552 bytes