Malicious PDF — malware analysis report

Static analysis result for SHA-256 a01f68437ed4cb0a…

MALICIOUS

PDF

75.0 KB Created: 2021-06-15 13:42:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4f27c5ebefdf7c1b28a2d6878b4ac4a7 SHA-1: 8ff6c29af6b1f8ae155e2846f8f37078e7c9f189 SHA-256: a01f68437ed4cb0aa17d04791a47575b644e1e37c92e8e103b126babd6f89a00
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which appear to be hosted on compromised WordPress sites or disposable domains, suggesting a link farm used for phishing or malware distribution. The document body, though partially corrupted, contains a title related to administrative processes, likely serving as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9605

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://crewmak.ru/uplcv?utm_term=que+es+direccion+en+el+proceso+administrativo
    • https://etonbio.com/newsLetters/images/file/vowonoji.pdf
    • http://leoclubmarsala.it/userfiles/files/33409589681.pdf
    • http://comp-art.ru/userfiles/file/demubu.pdf
    • http://alnoorcity.com/userfiles/file/78293693438.pdf
    • http://shuimotongyuan.com/userfiles/file/22073978195.pdf
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/640b7d07a6bce985cb211c3b0de13ae4/petil.pdf
    • http://asesorgubernamental.com/images/file/buvesodabuzuratabuge.pdf
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/7b4b95da1e5db4d3acc357c2553b76d3/tigajek.pdf
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/e07657c6700cd93ec12b36c3444c782d/rejarutimelipomarege.pdf
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/tl9e27ruv5me206ue1vcg3sukc/24518909588.pdf
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/j6qhrdk6fdqopag7ua1kf2ffgj/rudadezemufewigo.pdf
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c4f43ad33c9---85696869038.pdf
    • http://banghetretunhien.com/media/ftp/file/zivulixefov.pdf
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/colk8kh4dvn1k457ea5nk62m45/8611760213.pdf
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/dba5e1487caa181f7f30a2f8345697d6/tidakaruduxejonotuzef.pdf
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/79u2q4aok7dbdjcqkvfvubsgu0/zexedawasibip.pdf
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/pcfbtp8kgded30hjg77mr001fe/nopujijudasunuk.pdf
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/3mgf21okm284sqe8svh00ij5i2/mawalupudopimisetujopemi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f50e.bin
ef1ddab453e3bd241cf218100e557b052175cde712c741c4285a3ccc248bb042		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF50E 5340 bytes
font_01_sfnt_off00010722.bin
45104c07c6c72e3881a3ccff6ba51d8e17e83eb468f5f88171a2081dab75b2d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10722 11340 bytes

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