Malicious PDF — malware analysis report

Static analysis result for SHA-256 43018cf0b9d1c659…

MALICIOUS

PDF

60.3 KB Created: 2021-05-09 21:54:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 799ca2ecdd92655ac241e8eab24bc8a0 SHA-1: 316cefd21cc6e5b22e6b00669902173b3acdada0 SHA-256: 43018cf0b9d1c6594f38c11f2126b9654ceec0543943f912ae83263643da3f4d
154 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, specifically identified as a phishing trojan by ClamAV. It contains a link farm pointing to compromised WordPress upload directories, suggesting an attempt to lure users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific purpose beyond the heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9560

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://niestachow.pl/data/aktualnosci_imgs/file/51824126598.pdf
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16093a91a7e3a2---60112552440.pdf
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/5293461cce0d9ab963f1f77150687224/55269796484.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/5cff355b9003a16e6c893eb1bf2d3392/30147892586.pdf
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/505a325186b02552e20db53d71cc5d97/toxaduwobabelenivezubu.pdf
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/edee0e8714b67f91e860c8a3782e9977/tipiwutebadovoka.pdf
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/u24i8t4iq0s49glvtpufitfj35/tuxirapom.pdf
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/76eb1c585c384792c58d92f0962acda7/sutiruriduvawazuloros.pdf
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16090e8812cd81---jesitebaf.pdf
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607787da20f59---23132532459.pdf
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16072835af36ad---jedonixuxepemurupafuxa.pdf
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607168d2dcdbf---82980033125.pdf
    • https://karinbentum.nl/uploads/file/48698832432.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/ff68e8be3460f80d468cb46d48101032/6649952757.pdf
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16079a3be200ce---fobegowo.pdf
    • http://hgbs.de/userfiles/file/watuw.pdf
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3a998b0a7---lujaxin.pdf
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/a1c321f990ad711cd982756bc7154a5c/20576195721.pdf
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160740bb41f681---gidowonoxibigon.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=discrete+wavelet+transform+python
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d88f.bin
c7f0adb541f9d13178744646c64f5dbb1cba0b2548d316bff1ec9ffaa85263d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD88F 5296 bytes

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