Malicious PDF — malware analysis report

Static analysis result for SHA-256 98240d4bb83bfc66…

MALICIOUS

PDF

79.0 KB Created: 2021-09-17 04:57:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: db0af0d606003901c584b0ff24c61921 SHA-1: 79594bf9ba3d674afb90afb2bc3007038f2ec812 SHA-256: 98240d4bb83bfc66ec7cbe09d670f4ba10731d8d2d6a0e21fb7f03470ec54608
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, forming a link farm. The primary purpose appears to be directing users to potentially malicious websites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://pixomot.ru/uplcv?utm_term=disable+headset+mode+android PDF link annotation
    • https://ngusacdon.com/upload/files/41305567274.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/0c311caa06a1ac710276bbf436acb732/75127923734.pdfIn PDF document text
    • https://cpsguffanti.it/uploads/file/90475026638.pdfIn PDF document text
    • https://linlinline.biz/js/ckfinder/userfiles/files/sogidavadakatadaj.pdfIn PDF document text
    • https://smartcirclegroup.com/userfiles/file/19717019527.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/kirexewilexituzomefixize.pdfIn PDF document text
    • http://ajisushionline.com/uploads/files/piwajubamup.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea87d0101f---5695863810.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/lativuxekukupusafufepuke.pdfIn PDF document text
    • https://cometsecurity.in/admin/userfiles/file/81438936628.pdfIn PDF document text
    • http://daming-school.com/userfiles/file/nukumodeta.pdfIn PDF document text
    • https://moiatakashta.com/userfiles/file/xumaximixorejavumod.pdfIn PDF document text
    • http://soundspace.eu/Upload/file/67859860412.pdfIn PDF document text
    • https://clubsecurite.fr/webroot/upload/files/289870163.pdfIn PDF document text
    • http://caratow.nl/userfiles/file/71245239988.pdfIn PDF document text
    • http://www.pantonerestauri.com/ckfinder/userfiles/files/80383537245.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/88048671049.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/41f7c58f82f3c8d2cb1b2cfc4e2fa9d1/85267842225.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/fe5d2b715a719049f319803a9378ff9e/4370177416.pdfIn PDF document text
    • http://think6.net/ckfinder/userfiles/files/20210904083131.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd9df53b3c---4359607525.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d1e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1E9 17260 bytes
SHA-256: 94d98b7bfd86a47a10fc01252515276e6264d373f0635de932e8f629debac3cf
font_01_sfnt_off0000fe97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000116ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116AE 10656 bytes
SHA-256: 6b785e69526869c8910c7e026e1c665c4a9857b04286a050c98b08bf7dd6e244

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