Malicious PDF — malware analysis report

Static analysis result for SHA-256 88a249337e6e8542…

MALICIOUS

PDF

96.8 KB Created: 2021-06-25 12:29:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 295bd8ec7bab1ab6be2380050b8eb5d5 SHA-1: 0e9cb1fe7322d7ce82ba150633a842bffa384239 SHA-256: 88a249337e6e85424b9be5f2df20680d6e5c71e4df548e21df6833d0f3e49f3f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as containing a link farm pointing to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV also identified it as malicious. While no scripts were explicitly extracted, the structure and embedded URLs suggest an attempt to lure users to external sites, likely for phishing or malware delivery, aligning with the Spearphishing Attachment technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b43348dae0---zufuxug.pdf
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/tp6aadrhvbbc3nu35k7cf0t075/42368753130.pdf
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6247ada3c1---xagapamexodijedijo.pdf
    • https://cissud.com/uploads/ck_editor/files/bagulutawox.pdf
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/v58ms036gpqjco5sohtqcgot93/kitegurezivudavaserov.pdf
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b99f58ac0---6226366054.pdf
    • http://bindashnews.com/userfiles/file/fukasupefijav.pdf
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/b351082266ddc36baf7a0930e102f49a/wetonojalev.pdf
    • http://m2mus.ca/clients/b/b1/b1ca46fdb12d68e762e4a8b3318caec0/File/rowegiwepo.pdf
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/0660fdcb3b481967ab53610ec7b4067d/tinijovawifizeroret.pdf
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/af7deca3e0491e9b93e1ba4bb268d1d5/52108566296.pdf
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bf4ad53d1a7---dodixavej.pdf
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/pintuiii9tdjecfo3a9a4nf6t3/xuvebosomorapi.pdf
    • https://advance-pack.com/editor_upload/file/gukewikixo.pdf
    • http://tea-ra.com/user_data/upload/save_image/files/8517873540.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=business+vocabulary+in+use+advanced+pdf+free+download
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e84c.bin
b1c6688c4117b2eb132fe321d6e5c0cba7066824bbd4880a4905979a2499efec		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE84C 16080 bytes
font_01_sfnt_off0000fd7f.bin
5f345c148db1991c02391260ab0727a4c0146e274bd16a81c7555d42ebbdb8a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD7F 36356 bytes
font_02_sfnt_off000141ab.bin
48ad031920c3b2da7d14dfb7b624b545c9114cc96759b3f6b3caad259e7cc18e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x141AB 11076 bytes
font_03_sfnt_off00015b7c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15B7C 16792 bytes

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