Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf06903b1247bdce…

MALICIOUS

PDF

139.4 KB Created: 2021-07-22 22:54:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ab577e662588dd371afb0ad33f42679f SHA-1: d381278649a41c730a0df7020ea711436ae57173 SHA-256: cf06903b1247bdceed7a5a6e41758d5a35c5e758416a39bd26b4ed37d81f7f96
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to external PDF files hosted on compromised CMS upload directories. The primary purpose appears to be directing users to potentially malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9712

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 https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/328697dce5cf1dd52db5400fc3ae365b/24186171716.pdf In PDF document text
    • http://thesecurityguardunion.ca/userfiles/files/sozilatap.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/0a31d917cb78a547aa70a0f8793b37e1/4514309588.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16081463890520---wotoradanugew.pdfIn PDF document text
    • https://clubslotalmatriche.com/calcas/file/dalosesu.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/06e9f517b3983ccfce448057da80c186/42568680680.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/61345867925.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/7496131b069705cf472a9648cc00928f/37468346668.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090628f74052---77915632197.pdfIn PDF document text
    • http://matchonusa.com/uploads/files/57653751149.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/ca12f8ff3724cf4cfe1749670fdb3333/90364230976.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606c953fa60fe---sedasafitunuboselepoda.pdfIn PDF document text
    • https://obermeyer-modemarkt.de/upload/file/xopifesufobolod.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/53479241070.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/bebar.pdfIn PDF document text
    • https://gregor-biffiger.ch/userfiles/file/pogamaloxumapumexixugiz.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/f77ceeff3504d2baad210f90b47c7cb1/tabubusesuluwuxofeb.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/b4726921810927950f188e097c748896/xeliwixepokirumo.pdfIn PDF document text
    • http://extintoresorigen.com/images/editor/35917080933.pdfIn PDF document text
    • http://masonfamilyreunion.org/clients/b/bd/bdaf0a3c19eb5f10f0519c747c117e37/File/35315249268.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fccd54bea6---10460098541.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9e60a121c5---51945335869.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=all+that+you+rely+onPDF 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_off0001bf8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BF8D 10140 bytes
SHA-256: 949e5f6879d2b3ce657c61c5ba543f27634f12a19129b7f8d7ff8ac2175a5d11
font_01_sfnt_off0001d634.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D634 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001ee46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EE46 17884 bytes
SHA-256: 2218396cc007f6d44daad31c66decf4d4e442b634a81d1928d80454942922526

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