Malicious PDF — malware analysis report

Static analysis result for SHA-256 1608ab1c9bdc73dc…

MALICIOUS

PDF

74.1 KB Created: 2021-06-21 20:36:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 320823a4cf01b58b3fc8bc9693205b47 SHA-1: dfd12f6d7fdec66a1d354c851fe85eea224b58ed SHA-256: 1608ab1c9bdc73dcded84b3386ed871b8a071343e1b99f3fa25eb5495b676dff
96 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 sites or disposable domains, indicating a link farm or redirection scheme. The ML classifier strongly flagged this PDF as malicious. While no scripts were directly extracted, the structure and embedded URLs suggest an attempt to direct users to potentially harmful content, likely as part of a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://visusmarble.com/images_upload/files/6615610560.pdf
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1607662178c102---mumixivavogu.pdf
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c983d6e5f04---negevodefovijusoba.pdf
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16077553916e08---pijakadikekofunoz.pdf
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609770da27ac5---77453138668.pdf
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/96e01abf5d08d58130c312b78465f21a/69094428261.pdf
    • http://abc-tel.ru/data/File/kozazovenajutizuwipode.pdf
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/a921f26b7019229acb1e0294008365bf/29723399118.pdf
    • http://ecogestval.com/userfiles/file/7188252682.pdf
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160b4dd8f7376a---42943418709.pdf
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160900e30a137c---56305995977.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/ca165730m2pfmfa5f65mqdslfq/66164927539.pdf
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160c9b9366ae6d---28113159499.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=custom+3d+map+tarkov
    • 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_off0000e1de.bin
1f414ca6592ce57e01ed76c0b7947bc2bafe306aba2bf435caaaf25ff00e578a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1DE 5268 bytes
font_01_sfnt_off0000f3b4.bin
a095b53e39ac5df186001ec83e622039ea1629144d5c4a71076c4c6ff20265be		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B4 11900 bytes

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