Malicious PDF — malware analysis report

Static analysis result for SHA-256 611ed88435e04259…

MALICIOUS

PDF

68.5 KB Created: 2021-05-22 13:14:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bdb6135ef6fc8a3c6a547a2c5a40840b SHA-1: 0a33fcd988876273ecb931d5d2d63b148bfa03ef SHA-256: 611ed88435e04259699f36e4ade978b0f345a7844471c3431632a597ebf41335
154 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised WordPress sites, indicating a phishing or malware distribution campaign. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classifiers also flagged it as malicious. The embedded URLs are likely used to redirect users to malicious payloads or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8239

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 https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/ti11rbroupuhrs7h6osmarm060/zikimexevudiwiriraf.pdf
    • http://highendschmiede.de/highendfiles/file/dukaxosomewutapulowuwazi.pdf
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/c354ddd95c5ae3e516f34d07e7a714b3/47005614931.pdf
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/a0eb1b7879ff9c1f73981eeb01c8fa3e/78768037774.pdf
    • http://huntland.hu/upload/file/95654439114.pdf
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c86f06a6d2---xumigi.pdf
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093cc3d8967b---48427285079.pdf
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160847b695ecec---96221911698.pdf
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160962b2c91f23---fojavizokobifiloxu.pdf
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085383e0d189---gipupisazifotuxizuxagek.pdf
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/r8crlctedeqmitglhh33iqo3e9/71151863050.pdf
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/jcv8skj7im9ddbmtlgnpq7ba57/75039192245.pdf
    • http://cedule-plachty.cz/files/file/56417585589.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/c65a865f65fe1d1afab2a3bf68c6bb9e/98904838947.pdf
    • http://aarogyamedico.com/userfiles/file/5704802027.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=canon+in+d+piano+sheet+easy+pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f518.bin
aeb084ad6498e3654a11a40b5a6d6aa74c72173bc0119aa903d721d1c4de8371		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF518 5008 bytes

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