Malicious PDF — malware analysis report

Static analysis result for SHA-256 a824c3db1bb17ef2…

MALICIOUS

PDF

66.6 KB Created: 2021-05-26 13:09:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 53b6f0f879443d3bfb9264c12f026e96 SHA-1: 554ad25097d6dd898060ba679ea4fbdb455bd71c SHA-256: a824c3db1bb17ef2999831b29387d255db7ebc630406418a175c7a968c9ed69d
154 Risk Score

Malware Insights

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

This PDF file is classified as malicious by ClamAV and an ML model, indicating a high likelihood of malicious intent. The document contains numerous links to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure point towards a phishing or scam attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9173

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 https://laborke.ru/uplcv?utm_term=jojo+siwa+real+whatsapp+number
    • https://www.acetechnology.co.in/wp-content/plugins/super-forms/uploads/php/files/voknss1g4lduvicamjbjjb40b6/31063942100.pdf
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/rd9dakocv3s7pqm27c8fj47ff4/52061649902.pdf
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/af02508db2309ef7f6d355bddf003c29/dikolopebojegoxagabata.pdf
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983b75cbda4---1915410793.pdf
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0b752ee9d4c6d598e45768af298cc532/90241848225.pdf
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608d02bc9d355---komametisodamujimifikev.pdf
    • http://allycatering.com/userfiles/26881082031.pdf
    • http://www.bufolari.com/public/immagini/file/86228693855.pdf
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607018de78af6---momikubebexojo.pdf
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/c78eombsch5trf5c3576u1aviv/1393107754.pdf
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/c4f85b6aba893fb6e6924bb6cf74764b/15270522617.pdf
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/e9c56b8b164455fc32192ce0884ae87a/70417298161.pdf
    • http://lideparts.com/userfiles/file/1621617255.pdf
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc90b2c560---7037537707.pdf
    • https://atcotourismtravel.com/userfiles/file/xapup.pdf
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160716d9950d62---96541721944.pdf
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609329728b8cf---37103348205.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d97d.bin
310dc224bc618da2549ab1563b082e45611ec87c1f8ac534ae370f0552fb9cd9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD97D 5356 bytes
font_01_sfnt_off0000eb95.bin
827042f209f2e91aa3728a57c47317327285679946a4393c19c4a2108702c0d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB95 10720 bytes

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