Malicious PDF — malware analysis report

Static analysis result for SHA-256 42e176dfafef3a4a…

MALICIOUS

PDF

67.9 KB Created: 2021-10-09 07:02:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b170abc4fa20d4e239e488ed42966135 SHA-1: f236530b8f73df3abd1ad307d799fba1537240b8 SHA-256: 42e176dfafef3a4a6a64e5f531c867e0dc06dc354b0f5767145efaa9f55faea1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV. It contains numerous external URIs and is structured as a link farm, with many links pointing to potentially compromised WordPress sites. The document body is heavily obfuscated, but the presence of external links suggests an attempt to redirect users to malicious content or phishing sites. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7506

Heuristics 5

  • 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
  • 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://catamma.ru/uplcv?utm_term=baked+ziti+with+ground+turkey+and+spinach PDF link annotation
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff5a46e197---59690872518.pdfIn PDF document text
    • http://eco-building.cz/UserFiles/File/sawanowuniwap.pdfIn PDF document text
    • http://kimyasaldubeller.com/upload/ckfinder/files/fukufajozimazexufubo.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/d6ns0c8td52dp4j2alpe1h7m0l/39167875859.pdfIn PDF document text
    • http://mp-journal.com/media/file/1266708388.pdfIn PDF document text
    • https://eghamatyab.com/basefile/bainbookcom/files/rimoguzud.pdfIn PDF document text
    • http://csc-0898.com/userfiles/file/20210903050739_630zby.pdfIn PDF document text
    • https://pepsima.biz/files/file/xemosetoxoxemokibajuzu.pdfIn PDF document text
    • http://vsrru.ru/userfiles/file/dejejavovewupo.pdfIn PDF document text
    • http://cinebuzz.be/uploads/userfiles/files/woredepagoxevumu.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/o37vou7ds2n740lnavovtnrt60/jotinosaxuvorenaperogujum.pdfIn PDF document text
    • http://greensketch.in/userfiles/file/49033158826.pdfIn PDF document text
    • https://nomaquito-travel.com/editor-images/49479986802.pdfIn PDF document text
    • http://cablexconsulting.com/Upload/file/75191386516.pdfIn PDF document text
    • http://kammerchor-lindau.com/file/73064006244.pdfIn PDF document text
    • https://sunridgecorp.com/uploads/files/202109110150117700.pdfIn PDF document text
    • http://nwhouse.ru/uploads/file/6741451123.pdfIn PDF document text
    • http://architettobotteonpierpaolostudioabacus.it/userfiles/files/53829702745.pdfIn PDF document text
    • https://tiemhoahaibara.com/data/dulieu/files/55859163485.pdfIn PDF document text
    • http://laduses.nl/image/file/71407932093.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/96d6fdde342a725a406bb08ac6c534d6/17317696265.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/71922201141.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/devadutodu.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_off0000cd3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e550.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE550 19420 bytes
SHA-256: de0108c4db1b78ba2cef6ed9b9c0d0265dd71d48a10d721c68d133936cb89674

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