Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4b62aed3be3f3eb…

MALICIOUS

PDF

60.2 KB Created: 2021-04-29 06:46:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8d453ee8de2d2d084b8d942c9df9ac4e SHA-1: 5fc63cd8c5a5e0a8846175b5d0c123a122728aed SHA-256: d4b62aed3be3f3ebcf595b158807a912dc07a4d69b4cefbf5d86a0e68824e865
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm used for phishing or malware distribution. The document body is heavily obfuscated and appears to contain metadata rather than user-readable content, indicating the primary purpose is not informational but rather to facilitate malicious redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8151

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://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/f3dabd8c07e18bba0f04d1ac1668a43f/25205622252.pdf
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089f30a50a09---16994604709.pdf
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606f312c9172d---84515904991.pdf
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073ee5ef02a0---jodaxukofewomaw.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084bcc7619e7---rirorul.pdf
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16083f7c7c1974---59563751141.pdf
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/848gup15p746k08phbvqtn3vrh/duxibuxoborizobamir.pdf
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084e8d8a08a1---jepilezexakisolivutiviv.pdf
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/e8c8d78687962a1bcabcde01fbac8d06/90849712472.pdf
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/dfbcda830f63eb8a1ba0e0e32eb2a72e/63299533599.pdf
    • https://www.ndgai.com/wp-content/plugins/super-forms/uploads/php/files/fmg7e55d40moh9ottm7ga8mo1j/jedudo.pdf
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/bc33104ee31418cc2947888fe19381c3/56221399159.pdf
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/9960d0942974f22c599d872d588933dc/71488758609.pdf
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/5521d231d7f59cd7a63ae2e5175f0c89/68535273338.pdf
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/160789f5dcf874---15302211570.pdf
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160841e6ce374b---62503761422.pdf
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/j26o8552q1kqjorcdpl38euk91/sakizafirizabepude.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=arang+tampurung+cover+by+regita
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbbc.bin
416e7bd016a5733bf387ff0dea50ef8583b2df248b4aba4cc01b90f5d98610ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDBBC 5216 bytes

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