Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f0b9631c1fb75e8…

MALICIOUS

PDF

68.8 KB Created: 2021-09-05 22:29:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 56b832a8d9e32fa08e9fc430f584ed3c SHA-1: a970e9ea5ed6e575a29703a0e75e1d4fe484f0e3 SHA-256: 7f0b9631c1fb75e898d30070b785c23632e43c5224e9363d49e28c6c05357241
96 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to compromised WordPress installations. These links are likely intended to redirect users to malicious content or further stages of an attack. The ML classifier strongly indicates maliciousness, and the structure suggests a phishing or redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/b43e250cf287ff93b87d1e4d22e0ae81/kepaje.pdf In PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/74644620101.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/6bb8a8e459071e0ac48ab7ce169de785/8238035476.pdfIn PDF document text
    • https://senegal4d.com/contents/files/xogesaxox.pdfIn PDF document text
    • http://www.derbysignandgraphics.com/uploads/file/nabudeteniran.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/34568562319.pdfIn PDF document text
    • http://kahasat.cz/data/file/jeminuzaposegamulinogix.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/sitamopojatilijusafoxaw.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/15daba707567e845761bba7c7a65f292/816349138.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608b5eb7b1037---nixatutoxilugefekezu.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/fceea5f37be5d94f3535a71f70c0b6ff/tepulidufufilugugafiju.pdfIn PDF document text
    • http://doverhighschoolhalloffame.com/clients/2/2d/2d76883e1086210ef8e2c43836b0327f/File/90408369520.pdfIn PDF document text
    • http://lenosada.sk/editor_uploads/files/51875642449.pdfIn PDF document text
    • http://bishnutoursandtravels.in/userfiles/file/jofunajixawiwopalugifiv.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160888a82bdb6c---baratarekiro.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/n45kmrbs2u8nue52ai44e149q8/28653557619.pdfIn PDF document text
    • https://dukra.sk/editor_uploads/files/20447538934.pdfIn PDF document text
    • https://preprodpcb.com/userfiles/files/72989784004.pdfIn PDF document text
    • http://sobsai.com/ckfinder/userfiles/files/repawozoravukikijopivem.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/248bcbe32216074fd06f7f0555b328e7/wedagexamotul.pdfIn PDF document text
    • http://ambvetesopo.eu/userfiles/files/27582325126.pdfIn PDF document text
    • https://haidangpc.com/contents/files/75858451093.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=enzymes+in+human+body+and+their+functions+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000af27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c73e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC73E 11236 bytes
SHA-256: c30ff01ff43aa68910083e649b3a8624b351dc2a41bbe777bc339637cb0fe090
font_02_sfnt_off0000e135.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE135 14704 bytes
SHA-256: 691e54e9df9183f9836bca1999e1705e6b17178d756f83ca9e505b72c688405e