Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1b687d236b088a0…

MALICIOUS

PDF

81.8 KB Created: 2021-06-08 20:36:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 68e05511988a66fbe1a359eb2d2eae30 SHA-1: 88122d9abfff20adb7feeb7e0cf70b2170961727 SHA-256: a1b687d236b088a0e93c915d01a71c841442ab52e75fc189b1f80d520b5d9a5f
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised WordPress installations. The embedded URLs suggest an attempt to lure victims to phishing or malware-hosting sites, aligning with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9402

Heuristics 6

  • 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
  • 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=enter+the+dragon+new+movie PDF link annotation
    • https://pametnidom.hr/pametne_kuce/userfiles/file/nudigapawud.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082f1911a833---fopedigakojiwulovewefa.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/87c901e0c2b4b08cba2a429ebdded05f/66984727119.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/9e0d0de87de4aab42f27a12ee8f3c468/71827988317.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/07uj46uh3egl1gthvdktunm35c/kewapudumuninetobesudalof.pdfIn PDF document text
    • https://waelfawzy.com/userfiles/file/In PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6792818102---pifakote.pdfIn PDF document text
    • http://dbcasagayathottam.org/assets/uploads/cms_images/files/benogapetodunov.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079d40daded9---23969068898.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160729e1201d6f---96160410567.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad7513590e1---24410974643.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071a821df5df---jofonoponove.pdfIn PDF document text
    • http://residencecarlofelice.com/userfiles/files/nolejidirawopused.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/zalepirobo.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/tid6q4fq7a9bieam6r6o6m1p91/23689080292.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/5293832771.pdfIn PDF document text
    • http://vorne-sitzen.eu/pcms/content/file/rewopuxipi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011053.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11053 5140 bytes
SHA-256: e20e20522fe6b49ec4d485ecd876fe069345e647c7e9f43d61439d713ba0924f
font_01_sfnt_off000121bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121BC 11140 bytes
SHA-256: 0ed5a0b740baf3aae0089d5febc282b94ac99e83872c58f604c178a62f39ad8a

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