Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6af871aab549ed7…

MALICIOUS

PDF

63.5 KB Created: 2021-06-20 12:15:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b150e49e84ed4f32545d1eb4de369664 SHA-1: 71a3d28e069ea823472753ae6cfb089fd2beaa3e SHA-256: b6af871aab549ed7e53adc5b5bc19c7a5714ffeeda9ed26bc87cfde040a21bbc
154 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious files. The ClamAV detection and ML classifier indicate a high likelihood of malicious intent. Although no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8608

Heuristics 5

  • 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
  • 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.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca9d83806b---ruzevupojosebiz.pdf
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607bfd8a8d5d0---naxeramijamujiwoli.pdf
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/4m7d7u7tlq7o80te8ulu5oje9q/sujemon.pdf
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc07a2aea0---futesig.pdf
    • https://childconcern.in/trila/userfiles/file/92911522076.pdf
    • http://cdmatik.com/uploads/file/28828052471.pdf
    • https://xo-sound.ru/userfiles/file/57378288765.pdf
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/af7fd04411baa786724509b8a25a65cc/mejadovu.pdf
    • https://daaeportrett.no/upload/file/susaxokotev.pdf
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16090edb92747c---96428611599.pdf
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/70c2dc252cfbe7af6103052e0bdf317e/37643650089.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/adb0ec6bb3e4ff0943e3656dac5b74cd/26695767807.pdf
    • https://sssmri.com/ckfinder/userfiles/files/18721743281.pdf
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/q0be96795mp506ubnmrvgp3q55/38503012635.pdf
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/5cb759c26f445e9337e172ef95c0c171/37665167088.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=the+e+myth+book+pdf+download
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9b5.bin
155ad213b822f3ca74f9bef3431e3c9f73efe2e67de9c11e1553239d09ff61cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B5 5096 bytes

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