Malicious PDF — malware analysis report

Static analysis result for SHA-256 39774492b52da98b…

MALICIOUS

PDF

109.4 KB Created: 2021-09-06 09:58:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4ae05ccce76fb547b5c310894c29e740 SHA-1: 2331f461919d2d384ad83c6df662f326518cc473 SHA-256: 39774492b52da98b139a8e0ba2d3ccfb4a9715a3d488efb474f99fe24a791d14
64 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded URLs, many of which point to compromised websites or disposable domains. This behavior is characteristic of a link farm designed to manipulate search engine results or redirect users to potentially malicious content. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier clean score 0.1853

Heuristics 4

  • 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://queure.ru/uplcv?utm_term=schuberth+c4+sc1+manual PDF link annotation
    • http://nhuaduongnhapkhauaz.org/upload/files/71853602016.pdfIn PDF document text
    • https://digireg.se/upload/mowirebe.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16075137349423---koruseje.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/wojibefufuzirif.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/9pbjbs68ojpclri6tqbi1vj86u/91618497911.pdfIn PDF document text
    • http://25630638.kad.tw/kads/ckfinder/userfiles/files/ratidabufeledo.pdfIn PDF document text
    • http://mlead.net/images/e/file/banasuvokanirizepar.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160787eae07db7---70842819911.pdfIn PDF document text
    • https://thuaphatlaihanoi.net/uploads/files/xarem.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/5293411455.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16071f4011f0a5---50267033343.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/g8bie4fi1d4rji9toknlr0v559/4745693391.pdfIn PDF document text
    • http://ffarchitettura.it/userfiles/files/kekiwoxe.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/potujopodexetovi.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/f1d615c3e261e09c2a03d942a534961f/20669533220.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/e346bd0ce022bcee566e92b0abe7c381/mikejol.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc737bb3a67---perolu.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/genulunim.pdfIn PDF document text
    • http://harekatmemuru.com/images/Media/files/kusifedikorar.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/tarozuvovamowadazofuki.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/9d440c2d7bdae89e7d6836c4c355f4b0/vurejutalefovefa.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16115869548571---kobalitaruzifijeludewa.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/16080ada9c5cb2---25013273485.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/34085944602.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/c01851646e36b59d127b4620a6e43f45/79866804633.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd5a35ae914---5559986379.pdfIn PDF document text
    • https://mnlex.it/file/tuvadup.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_off000166db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x166DB 21020 bytes
SHA-256: fe20187ad77b473bd9676a1d46ff5b76146dfa5e83088c3c6c8022f7e4c9c408
font_01_sfnt_off00019d80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19D80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1