Malicious PDF — malware analysis report

Static analysis result for SHA-256 834662286469ca4a…

MALICIOUS

PDF

70.3 KB Created: 2021-05-24 12:23:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ae62d846f3d66ffa40898a7a9fc6f217 SHA-1: da5f5cc794a75d8063071a463fa644a3a66a7991 SHA-256: 834662286469ca4a1d7595d77a4078cb43a5dde73d87b07ca0f7e7f15639b90e
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9817

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 https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/afc540d5eb631dba7e02e866269f6068/kogegidubupusazonavapir.pdf
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160715fa4dbae4---zazivajurig.pdf
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/vcvd252t6l4fau9gdvh7qnmuk0/moxet.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609070104ee3d---60986278364.pdf
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/896510e043a2f15827016b562ad9c0d9/keleremi.pdf
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082eb0b21c72---34275972129.pdf
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a6a184cce0b---56331437972.pdf
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079a6276c8ce---73706874456.pdf
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/6145c71467fe6c915bbbfc6edb4fe596/wewinevumefikegesex.pdf
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/24dbccacaf39e4c1e3aded6681b83f5c/75107536449.pdf
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/16085038063145---mijowadodis.pdf
    • https://aduanaldelvalle.com/userfiles/file/72554158794.pdf
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/b40e1758d362ce6eaec6682d7222caac/29482206205.pdf
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a59b5c97a51---xawedinixim.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=how+to+scan+on+thinkorswim
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db83.bin
2249ed22c628f4f414b3f4818adbed88c97a2336e8cb04d75c68417678be4d0b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB83 5124 bytes
font_01_sfnt_off0000ecd9.bin
e7ee1159d936115c2174258e6767cc8a1cb96fc3e5016ad82dbb2d028ed135d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECD9 11940 bytes

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