Malicious PDF — malware analysis report

Static analysis result for SHA-256 33efd4ec5e9b2f72…

MALICIOUS

PDF

77.6 KB Created: 2021-09-18 14:44:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b9f28181c8e4f3de4b9b1d0a7c630975 SHA-1: e6bfa57d583b480bf588e77206ebf47f3401e805 SHA-256: 33efd4ec5e9b2f72008135793f0437c96ff85215286e2f72e2fabc9c0003b4bc
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs that point to various websites, many of which appear to be part of a link farm designed to obscure the ultimate destination. Heuristics indicate these links are used for SEO manipulation and point to compromised CMS uploads, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5190

Heuristics 5

  • 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
  • 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://smidgel.ru/uplcv?utm_term=shadi+me+jarur+aana+full+movie+download PDF link annotation
    • http://cateringkieuan.com/uploads/userfiles/file/41734215446.pdfIn PDF document text
    • http://kvbm.org/pds/userfiles/files/48175601589.pdfIn PDF document text
    • http://qamsar.org/userfiles/files/57003646733.pdfIn PDF document text
    • http://textstricker.de/benutzerdateien/64037528807.pdfIn PDF document text
    • https://questyme.ca/userfiles/file/bunomodaviraxusiwaxetetur.pdfIn PDF document text
    • http://surausa.com/uploads/files/pixojivuguxo.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161345af8181e6---ruzizibilaborakubonopol.pdfIn PDF document text
    • http://hydrogears.com/survey/userfiles/files/joraruzalop.pdfIn PDF document text
    • https://www.domaine-boussard-chablis.fr/ckfinder/userfiles/files/24327087544.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/4e6f9fcg4gt7k79o234cp198m9/55304241580.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210914123730.pdfIn PDF document text
    • http://105chers.netsociality.com/upload/files/bajepolikurezaxepoxanim.pdfIn PDF document text
    • http://mega-treid.com/userfiles/files/11830350812.pdfIn PDF document text
    • https://sunsetlearningcenter.com/userfiles/file/fedif.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/zawobed.pdfIn PDF document text
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/fisem.pdfIn PDF document text
    • http://phutungtdc.com/upload/files/5717360797.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/vowus.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/m03jbi5gtj86p3g8np4lpa2blf/xexiximemugu.pdfIn PDF document text
    • http://csc0851.com/userfiles/file/20210906022242_d8glgu.pdfIn PDF document text
    • http://bamor.org/userfiles/file/8116380361.pdfIn PDF document text
    • http://thaicockstar.com/ckfinder/userfiles/files/78521168879.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF56 17224 bytes
SHA-256: dcfc124aa14acbd68508131b476ee1a0aa985699d75416882dbe5b765b10312b
font_01_sfnt_off00010bfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BFD 10812 bytes
SHA-256: 42400f2e7f5a59c6e2edfb03275be8f896f492272f0ddd83084e5ee34f01266e