Malicious PDF — malware analysis report

Static analysis result for SHA-256 326f35caf68f696c…

MALICIOUS

PDF

86.6 KB Created: 2021-07-22 22:34:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6c8b7c8a87ebcae97b9c121092218959 SHA-1: ce0cafaa3ee94ca1990ab42d060efa2ccbd01b8f SHA-256: 326f35caf68f696c4b712db0c138e2a0edfe5e07b7ca853b7d3f7b4cf378237a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains numerous links pointing to compromised websites, indicating a likely phishing or malware distribution scheme. The presence of multiple links to WordPress upload directories suggests an attempt to host malicious content on legitimate but compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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
  • 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 http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160986f27986d6---zolemimalalirorexatupe.pdf In PDF document text
    • http://hutbephottaihaiphong24h.com/upload/files/vosikuviradedinef.pdfIn PDF document text
    • https://principesgs.com/userfiles/file/dezesulawulibota.pdfIn PDF document text
    • https://gachbinhduong.com/upload/file/bewiduramugadozanilif.pdfIn PDF document text
    • https://rtvpuls.com/ckfinder/userfiles/files/nipukaxapegakam.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160988947bd41c---6696413102.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eff8673864---lakuwonu.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/24e1182a9ad952258d3104d362aa910b/95242663016.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/55051347653.pdfIn PDF document text
    • http://irina-beha.com/ckfinder/userfiles/files/39991097288.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098a21680619---61824356721.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/47842b826b6e4bdf5152600a4392b344/vekenirobeg.pdfIn PDF document text
    • http://onellenorzes.com/uploads/files/rupibovigazulijuzivira.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/fegajufebekugadikole.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6dc2139f75---54460516840.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609f393d9ad3b---91261469254.pdfIn PDF document text
    • http://kenshopvn.com/uploads/files/10669451579.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e025393edd2---40222195043.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/nolunidoj.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/r8dici24e5q8uacdinlqp26ci4/99271584287.pdfIn PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/93467184248.pdfIn PDF document text
    • https://speeddating.lt/speeddating/ckfinder/userfiles/files/37061866658.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/15259076541.pdfIn PDF document text
    • http://kapli74.ru/upload_picture/70241820455.pdfIn PDF document text
    • http://chinalabware.es/d/files/bosetogigofazodudavokadum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=c%2B%2B+stack+implementation+using+linked+listPDF link annotation
    • 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_off0000eb86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001039d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1039D 10980 bytes
SHA-256: fd95add45ea2ce5abe519d39257f9c6438365de71eebf32d69c11f6cc7c173ac
font_02_sfnt_off00011ce4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE4 17936 bytes
SHA-256: e9382904e70ac79b99f21e209d5c839eaae61ba2a803609b562c58b9c27a2b9c

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