Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef67211d95450732…

MALICIOUS

PDF

92.0 KB Created: 2021-06-27 14:51:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 038289b3416bf731f4d7dc6c60b87141 SHA-1: a32f469375389abbc3638f1bef1bf34939b04a81 SHA-256: ef67211d9545073200b35afa9867a7d3433877a6d39ff8733bc9cd44226ccbff
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to compromised WordPress upload directories. The ML classifier strongly indicated maliciousness. The presence of these links suggests the document is intended to lure users to malicious sites, likely for phishing or to download further malware. No scripts were extracted, and the document body was unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 https://allytemp.ru/uplcv?utm_term=cookie+clicker+console+code
    • http://spoanalyze.com/wp-content/plugins/super-forms/uploads/php/files/a32b2c4717767c5703f311bfd2f3bff6/86216848349.pdf
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1b2d12045c---votelokuzinivubav.pdf
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/43c3d396f17d11377827b293e35885e2/89803782120.pdf
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/c95a7245d4aaff274e4bd1c6b0fdf5ae/95847311517.pdf
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/da13db120dc4d03abf5564396d690a8a/mefixoz.pdf
    • http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/supedarebisetelepamif.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d389dd602e---daguzuxaxusadogotiralot.pdf
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/714a38efbaf5ecd684b86df89ebffc11/7513129748.pdf
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/16070d09c32e8f---42147288576.pdf
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/59835de290bcde5ded86b2e160b5993e/gifud.pdf
    • http://caphegiabao.com/upload/fck/file/75861286936.pdf
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160747c2d2ba89---42960082641.pdf
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085659208e69---19605945137.pdf
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a68d4342a4c---37253554706.pdf
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac6dfd945c2---26824399627.pdf
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac78dfc4e5b---90916283927.pdf
    • http://lacyfamilyunity.com/clients/2/20/203fd950dafdada58ea32e7b96f0d147/File/28962146585.pdf
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160cb40bcaf0b4---lurumosijubetem.pdf
    • https://btegypt.comfile/59316784486.pdf
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/7534e8a51ab0d5394c9f88b68026b4ac/befuxarijipup.pdf
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090045b78109---86000812690.pdf
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/1jb0erim7hq1iic8n1lp4rdnfj/fubukibutufovokunaf.pdf
    • 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_off00010146.bin
505f78ab49b63f787d4d2b414221d8dcedb787899ed83d64f4de24c8bd58e052
pdf-font-stream PDF embedded font (sfnt) at offset 0x10146 10224 bytes
font_01_sfnt_off0001184f.bin
fc1d28d39d2e8b2fea4da0821c44a0e4cee7046d3b0396fd666a12965caec901
pdf-font-stream PDF embedded font (sfnt) at offset 0x1184F 18456 bytes
font_02_sfnt_off00014960.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14960 16792 bytes