Malicious PDF — malware analysis report

Static analysis result for SHA-256 397a38679824baf7…

MALICIOUS

PDF

85.9 KB Created: 2021-08-15 15:37:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3fdcb68bde73a122cc3bc63a2a2cbb72 SHA-1: b322e509319743cabec48a108c2e88d059f64bcd SHA-256: 397a38679824baf7873d8068dd46f33c3f38fc018724cf281ecf5075caed1f47
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, and contains embedded JavaScript. It also features a link farm pointing to multiple compromised WordPress sites and disposable hosting, suggesting an attempt to obscure the ultimate destination. The embedded JavaScript likely facilitates the redirection to these malicious URLs, which are designed to host further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7161

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://philabc.ru/uplcv?utm_term=how+to+get+sound+from+acer+monitor PDF link annotation
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2d86b99bf---vugufebafolaxulorizagete.pdfIn PDF document text
    • http://ediljolli.com/userfiles/files/18814639973.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/e2983a468d42dd23dac5cc7481b4a298/65685511000.pdfIn PDF document text
    • https://ifbscalidad.eus/files/galeria/files/8630120323.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afb4419f61b---jigafaxoxofewiragukupuvu.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/85191941125.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/87389010966.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/nenimasemolagux.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1d0f0c9c7---8759621335.pdfIn PDF document text
    • http://romengo.com/ckfinder/userfiles/files/vagubiwesorufawetulozidan.pdfIn PDF document text
    • http://technoauto.jp/js/upload/files/10090444061.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070cf7541e8e---madurogina.pdfIn PDF document text
    • https://tonycustomtailoring.com/nbloom/fckuploads/file/zuzazi.pdfIn PDF document text
    • http://bluenanum.com/ckupload/files/wiweralexorozi.pdfIn PDF document text
    • http://chinazzjx.com/d/files/35794456752.pdfIn PDF document text
    • https://aviatroglo.fr/IMG/file/rexebeta.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/7b30bb0bd769e0fc970682038e3a71fd/xadomafetoz.pdfIn PDF document text
    • http://studiodabo.eu/userfiles/files/nixujagulafinawowosusiz.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160b1f861cb5c0---xuzivesin.pdfIn PDF document text
    • http://rld-carbon.ru/file/81456928404.pdfIn PDF document text
    • http://clinicaveterinariailmarzocco.it/userfiles/files/wusunilebetulevamazomile.pdfIn PDF document text
    • http://eptesteplelek.com/uploads/file/talajefadimep.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/m4lb4gigd7uelg2tdd48u781i0/munazigimexavuvogotuladaw.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000118ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118EE 10952 bytes
SHA-256: 9301808780f1f804dee0ff9e153e3ae56b6750b697595e81377b4c6a4adfeba8

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