Malicious PDF — malware analysis report

Static analysis result for SHA-256 15426a30f036abbf…

MALICIOUS

PDF

82.0 KB Created: 2021-06-25 14:37:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 440a3780b6a61817c6ce0eede19a6d98 SHA-1: ffef944ced8cb785d12816cb83bfb8ca5aed20c2 SHA-256: 15426a30f036abbff84dd31bdb966731556822e9a3c187b013419dbb133d8be5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, indicating a high probability of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised CMS upload directories, likely serving as a distribution point for further malware. The PDF structure and embedded links suggest it's intended to lure users to malicious sites, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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
  • 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://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/i4h9thf2f3jg8blitf614v19hq/78452675710.pdf
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa3abbb125---zaropizarawisete.pdf
    • http://canxetaidientu.com/images/file/32082179757.pdf
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/0c401cba87ecaa0cd158b1d2601335a8/wipogalelasejazip.pdf
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/rfvubrslc9knohodofc2h2l17s/sowadivewupedig.pdf
    • http://nw-line.ru/generic/uploaded/wapitelu.pdf
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad8deb9083---18246588498.pdf
    • https://whitesal.com/data/images/file/3136_20210515222214.pdf
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/580d89825b3a9a79071f07ae865d8305/jiritesojozudakinijewino.pdf
    • http://vitaminyplus.eu/files/file/nakab.pdf
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/nphuuic44i20lgpkj6q4staa6u/jejiji.pdf
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/cfb7d9fd24aaf0cf8dab1c8ccca29d79/30695675308.pdf
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/018a5c3d98d27299d9736a3fb3c4b776/talitagubijof.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+get+pack+a+punch+on+shadows+of+evil
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da56.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA56 16792 bytes
font_01_sfnt_off0000f268.bin
64c88cf3854b05d93f3c86b8d159a928433f780305b0d353a21aeb0cc4ba1b78		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF268 17968 bytes
font_02_sfnt_off00012178.bin
87d0477856b3e3e7a9a2c179a7a7a32c939236f2eaa298359aa953f61944f53c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12178 11132 bytes

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