Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f8acdb1753091b2…

MALICIOUS

PDF

81.8 KB Created: 2021-05-20 08:35:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 34eebbcadf4e419208166417a4d75b05 SHA-1: 2d3f14dadcfe4d119321b2f6be0fe1f41df2d212 SHA-256: 8f8acdb1753091b2f1570d4cc6de933b5f4dbe0c1f4c7cb17fc517cee405377d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous URLs pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users. The document body, though heavily obfuscated, contains text related to downloading an economics textbook, which is a common lure for phishing or scam operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a5871aa7485---gonorodomevobaxumoxoribu.pdf
    • http://classicalgardenornaments.com/uplds/file/wumofejunizi.pdf
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/b03bb5562f64ba855dffcbf764019988/5099075852.pdf
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609459bf53448---19001309715.pdf
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608c134d7ebef---79484040428.pdf
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/5951d598a46a6d58de75b9e7cc13b022/zedelasoloxel.pdf
    • http://dabaizhongxue.com/upload_fck/file/2021-5-16/20210516132812482531.pdf
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607595ff404f9---98197342087.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/6is56gr9boqm5fr131o1j42oe5/70328185685.pdf
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/1a486baf65a4958ae32175875fc8f0da/11919254499.pdf
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a29225722af---pobebewef.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/pt3q9e4blu4g4rcbcgmir3gav6/lizuka.pdf
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f08d2d2b6---wapal.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=solucionario+economia+1+bachillerato+mc+graw+hill+descargar+en+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbf0.bin
01d27e3d32737dd232b75138be4476b5a48ce3184660d2787be53520150463f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF0 5836 bytes
font_01_sfnt_off0000efa3.bin
0a4e38a5d5ff8131d7901445219cb1904cc7e4f3d27c168dc5ff0b7cfe692c5d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA3 13044 bytes
font_02_sfnt_off000119a3.bin
a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x119A3 16204 bytes
font_03_sfnt_off00012ed0.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12ED0 4324 bytes

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