Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc4effc6abf781a7…

MALICIOUS

PDF

84.8 KB Created: 2021-09-05 20:00:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c6231c3ff4f9beaaea21da31229f8f35 SHA-1: 3f40ab46150e0b0c8ad683542123d47d98edc3da SHA-256: bc4effc6abf781a70c17eef49c0987cfc5efabbe383e5b967ed08be42b21ff2c
156 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. The file functions as a link farm, containing numerous URLs that point to potentially compromised websites or disposable hosting. These links are likely intended to lure users to phishing sites or download further malicious content, aligning with the characteristics of a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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
  • 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://ketchas.ru/uplcv?utm_term=dementia+pdf+2017 PDF link annotation
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/6104fc8b8c761479f6afcb9315d0c922/sudemomafixelaraxoze.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d4d0145fbc---95188783196.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/a653k556emrqn596hmk3ilkovp/fenufobowekotiron.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608f850a5bca2---98173664047.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/kajezumumutonag.pdfIn PDF document text
    • http://vandervalk.reviews/app/webroot/files/userfiles/files/nusikezufipa.pdfIn PDF document text
    • http://sportsgarten.com/editorData/file/wobevumotemuleni.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/91188496294.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/jufazobaziwifojexa.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/b9d1929ed63e90bc8bf5fdd99985b8cf/19205110880.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/77357640582.pdfIn PDF document text
    • https://ortechindustries.ca/ci/userfiles/files/taxisejusejov.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16086078d8a0f5---72553014076.pdfIn PDF document text
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/v2gtnile3f3cobus8vjeu54g1e/3617075820.pdfIn PDF document text
    • http://orem.mn/uploads/files/72055813469.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/9db848fbf2638efb77905c187637f07f/rabibodogeje.pdfIn PDF document text
    • https://bwawarszawa.pl/upload/file/zimozokivimapimunapewa.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/38961913640.pdfIn PDF document text
    • http://sushrutproctology.org/ckfinder/userfiles/files/zaxawuwinus.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbeabb3e3be---40086477140.pdfIn PDF document text
    • https://delaneyllc.com/ckfinder/userfiles/files/98064244322.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/2332022937.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/20adcd477200454515dbcdff4b690590/28247353447.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_off0000eaae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000102c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C5 10572 bytes
SHA-256: 91b51ae81734062dab05c622686fe9c6053b45a9389dcee7cb35186833db8566
font_02_sfnt_off00011afc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AFC 16724 bytes
SHA-256: d53fcb956372713be072cfaca505ff3145cf5bdae4979774f8e2c1fc49511cef

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