Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f670ca8b37f3912…

MALICIOUS

PDF

97.1 KB Created: 2021-06-29 22:14:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0a23185969d42a547f42eb24cc8a483c SHA-1: b84571cc6d440c3f8632f562def23ff28a107f6e SHA-256: 0f670ca8b37f391235228382ef03a09d1bb812cf179ba2a9d5aa5922d456ea6d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://cructi.ru/uplcv?utm_term=bill+of+sale+for+vehicle+without+title
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/n6r3710urgilh5nnoi4vk02sqs/31443640240.pdf
    • https://atl-50.com/files/file/kumuwusiwop.pdf
    • https://rajaunited.com/contents//files/89136752062.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/f71d169cf4b093ace7fc833b20a7414b/39012383644.pdf
    • http://suttonoakfarms.com/clients/880813/File/jaxadusiwomuzudumobewode.pdf
    • https://schmitz.cz/res/file/67031772570.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/f5qv48j63kssn41m6e19qhdv50/31923193804.pdf
    • https://aduanaldelvalle.mx/userfiles/file/tizejizovejugibodejidus.pdf
    • http://orchid-daikanyama.com/userfiles/file/xuxazonanijabekumosomo.pdf
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608af9da27198---regigusasozifasup.pdf
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f0c80ecabf---gelejore.pdf
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1038faa2a3---72367380403.pdf
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/f039e6d8c0d1483c54a9e535769bdc38/bokevixiwojepidaj.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/57fe475678812925f3261568fd988399/rofusegigolerilawaju.pdf
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/1a088b0645f22164c8dd3be171d6e952/31864827233.pdf
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/e61d5c96be7aec11c956eed6ffbb4f80/49158325040.pdf
    • https://airtelco.com/data/users/_/email/files/gigipalikam.pdf
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/9152ff724ba9c33a2b93558a6a2650a7/7016456011.pdf
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160802045ca7fa---83178415176.pdf
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe49f63cb9---74409474772.pdf
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/m0uikd5eqj0p3lso1vd2u3als7/63020156380.pdf
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/28220593756.pdf
    • https://hgb.se/filer/file/92387129192.pdf
    • http://barudan.hk/UploadFile/file/20210519162631918.pdf
    • http://nguyenthaotech.com/upload/files/daxadubugojuvez.pdf
    • https://footballsod.com/images/ck-uploads/files/37967847904.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_off0001174b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1174B 16792 bytes
font_01_sfnt_off00012f5d.bin
82a006b2c0b2a4c0ecc7e3d66d3c1b7e584162bbc30d357e6d1f64ced9e86ae3
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F5D 17764 bytes
font_02_sfnt_off00015e3f.bin
1f1dd9c5eaea8bcde115e93e5fb6c2364423cdfa44c67e618e62f032c415c8b9
pdf-font-stream PDF embedded font (sfnt) at offset 0x15E3F 10632 bytes