Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d92c4411fdfadc7…

MALICIOUS

PDF

70.2 KB Created: 2021-05-10 03:29:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 910b176b4ca712a10b84492fffef3345 SHA-1: b7b6301ad6d2a1494534a82fc77e83a04a55859d SHA-256: 0d92c4411fdfadc760893cfd6e7b5565f68cf16632977d5b16ab770efed4bb11
154 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9684

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://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/2afrke87cv57mpfusljmjtjdh2/99401204186.pdf
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c759231348---39320509251.pdf
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16089c34263bc9---vesenikosomevalixodisires.pdf
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/b51d33f3c4f51332cd8e8b515f1bb430/19519288181.pdf
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160710eebb4657---36091466018.pdf
    • https://opuntia.eu/wp-content/plugins/super-forms/uploads/php/files/f49c864a8e9226f983de8cd5d30459b4/90858426834.pdf
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/d311ff31635b953e4971632f19111966/58531779999.pdf
    • https://aquafilling.com/userfiles/file/81669701770.pdf
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/2d6e81c2ec5b861a4bae558adba99b48/pidapejav.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/5iht1bdegnj0gd6jueav03hc65/49890926275.pdf
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/b6c161bf68304d18d4808dbc0ce24469/96125519212.pdf
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16082abcf184ec---40080687492.pdf
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16096f1bfc41ee---44927212173.pdf
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/eudjgtgbnneu6nc6cbpjtq0fnh/lonaxulaf.pdf
    • https://x-software.cz/data/file/5169778158.pdf
    • http://anhuizpyy.com/upload_fck/file/2021-5-10/20210510052022226808.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=soft+aafs+forensic+toxicology+laboratory+guidelines
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff5a.bin
285cbbd422a1b0c2d6fbd7a0953f9ff75fd160498bd29172afe097c7b202ae79		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF5A 5600 bytes

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