Malicious PDF — malware analysis report

Static analysis result for SHA-256 952cbadac4cfd212…

MALICIOUS

PDF

73.0 KB Created: 2021-06-22 12:48:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4920122b28d4a2b8828f53d1cf6c4da9 SHA-1: ff0100c857a720b413117b1112df884cecc9cee1 SHA-256: 952cbadac4cfd212e56e59abe9ea3b943ee24ab7c899052208ee72846adff182
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm or SEO poisoning tactic. The embedded URLs and the nature of the heuristics indicate an attempt to redirect users to malicious or compromised hosting, likely as part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16099ae91007e9---numinubuketunuvobeg.pdf
    • http://flywings.sk/UserFiles/file/zedilanav.pdf
    • http://highendschmiede.de/highendfiles/file/44218489186.pdf
    • http://abwpetersburg.com/uploads/files/fiwavimarewevam.pdf
    • https://alshamiltrading.com/alshamilfiles/file/nopamomesolutamug.pdf
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/837dc1c35b4476fd009cbf220dc6ac2c/24671471430.pdf
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/ndkfo3rfo4u0seifndhheg2s6h/52028394896.pdf
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/68c109dd728eadf3a37c276b2b242098/21064118304.pdf
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/3d83fb4772156c7e05167c49bba844f9/74305325396.pdf
    • http://centrons.com/uploaded/file/87277973660c0f977525eb.pdf
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/12175575243.pdf
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7b113962ee---dolijukafopilefos.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/gifh55k1pmub5misp7vbq4g305/kogenosuzabapejuvupowe.pdf
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/4e60a0f0bf558efb4b775e337c6734b5/xegulelepujewoz.pdf
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160ac216631364---gosufuna.pdf
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/c8eca5bb2a595740f6ed618383360658/garadunapize.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+get+octavia+systems
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e130.bin
cdb9e641dae24b14b9f86fd180fa664f9f25678f37df5161e0011f611a4c6d2f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE130 5208 bytes
font_01_sfnt_off0000f2ff.bin
b5a689255a9e87255ce381e89ac2e9c29e076e7ccfc8c4b4299ef5c35ff27ee3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FF 10612 bytes

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