Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bee0eb135518a17…

MALICIOUS

PDF

82.2 KB Created: 2021-09-18 08:13:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 2b1ec6957c6cf7b8d84ab0e27d8978e1 SHA-1: 7f2b1682cbd0c59e4f75588677196cedb0f0f145 SHA-256: 6bee0eb135518a176b9ac66c68bb986744402863850a97f7e53a18422ab0bb16
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics and detections.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://tdsns.ru/userfiles/file/wotupotakovefogirutunexuk.pdf In PDF document text
    • http://tunesistudio.eu/userfiles/files/96441416518.pdfIn PDF document text
    • https://vresponse.net/userfiles/file/wixomunibofog.pdfIn PDF document text
    • https://dnmpaint.com/sdcc/images/file/kemabobaxulim.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f84eceda33---nifixorug.pdfIn PDF document text
    • http://helderlive.nl/ckfinder/userfiles/files/xizarel.pdfIn PDF document text
    • http://mxag.com/upload/browse/file/36028717099.pdfIn PDF document text
    • http://studiotecnicostradi.eu/userfiles/files/42522019070.pdfIn PDF document text
    • https://dacola.com/upload/files/46858370687.pdfIn PDF document text
    • https://bk.knu.ac.kr/ckfinder/userfiles/files/gozekexizexageg.pdfIn PDF document text
    • http://chochosanencino.com/uploads/files/lopebo.pdfIn PDF document text
    • https://studybrilliant.online/app/webroot/img/userfiles/file/4827348034.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1b31a2c70---retiwukesaka.pdfIn PDF document text
    • http://solmoda.it/userfiles/files/95059881358.pdfIn PDF document text
    • http://kbfrutos.sk/images/_file/29479758780.pdfIn PDF document text
    • http://firmen-bekleidung.at/userfiles/file/kikaxixenipexes.pdfIn PDF document text
    • http://simonkuehner.de/gfx/userfiles/files/68524697723.pdfIn PDF document text
    • http://nwatchonline.org/userfiles/file/muvipegate.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142f550f3a14---gazuwanukuxojos.pdfIn PDF document text
    • http://solo-reisen.com/media/images/file/5287335913.pdfIn PDF document text
    • http://cistenivytahu.cz/upload/file/musevemebugodugajit.pdfIn PDF document text
    • http://gaushalango.com/uploaded_files/userfiles/files/samuriraro.pdfIn PDF document text
    • http://nhasachthunam.com/upload/files/gilusovufunudeduworul.pdfIn PDF document text
    • http://9jamail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/metilomolo.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612f349247aba---ludozazusodixefo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=android+1+bike+racePDF 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_off0000defc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEFC 10316 bytes
SHA-256: 13a03fbae1a49302ddb909ac59e212ed881b2f5fea043c3cc69e8d614b0cc8a2
font_01_sfnt_off0000f660.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF660 17256 bytes
SHA-256: c27eb29b699df3067bdc52317c3d8377ba745505efb92cc4cf6b79c2583c9f2a
font_02_sfnt_off00012301.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12301 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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