Malicious PDF — malware analysis report

Static analysis result for SHA-256 42288e2665d1cd8d…

MALICIOUS

PDF

76.7 KB Created: 2021-06-26 00:48:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3765a8190ec4d49eed97e78419b9aecb SHA-1: cf205def2e584240b0323d7e1565cbab2ee0f0ba SHA-256: 42288e2665d1cd8df238803b0f802df7cbfe33878ea2ba758cb46aa623e2b8cb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to multiple compromised CMS upload directories, a common tactic for distributing malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The document's structure and URL patterns suggest it's designed to lure users to external, potentially harmful, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca8c8a0cf6---lafujawesujoxujodime.pdf
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086383351ee4---6181008581.pdf
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/57690e7086bb77577f2a3ff6e9bb9828/1386830603.pdf
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606da57e5405a---37248633449.pdf
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c14ff93ad4---fudosepisepufafarekav.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160911bafc15b9---kabemaxuxaxuwategalafe.pdf
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/38a16f46c6b1b9d7981bf27459bc5289/1766331899.pdf
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/sguhe4kujdj47vdtmapp4r8qpn/53939311812.pdf
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a32bc703271---nobufagifote.pdf
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/fab5222b2c1df11e42095d0d434091d7/tofoxe.pdf
    • https://e-fasteners.eu/media/file/pewutonupoj.pdf
    • http://expertsystemgroup.com/file_media/file_image/file/juxonalulamivunulevu.pdf
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/0e1c07028caeb061ce415d772daab9d5/98796103257.pdf
    • http://conblocmanado.com/pics/file/76866648695.pdf
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f494c6b17---vefinudetuven.pdf
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609472be1fd93---81793741407.pdf
    • http://peaceinsrilanka.lk/userfiles/file/bisesejejaruresikepapopa.pdf
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608d83765b3d2---63160332434.pdf
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/0d8cba34fefa7b07b3b13c07da510f8a/piponatubun.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=bangladesh+two+letter+country+code
    • 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_off0000c7b1.bin
20c26c9dbfe705ec2998615bdaaeba4c0c1185392d0a006123b1f5fdd7cae6e8
pdf-font-stream PDF embedded font (sfnt) at offset 0xC7B1 10912 bytes
font_01_sfnt_off0000e0d7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D7 16792 bytes
font_02_sfnt_off0000f8e9.bin
fe3d3abf547f557c6a34e3456cf019c92589e75d883aaa82f62409d9aa37198e
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E9 17176 bytes