Malicious PDF — malware analysis report

Static analysis result for SHA-256 9726acc238d43cb5…

MALICIOUS

PDF

81.1 KB Created: 2021-09-01 20:11:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d7a69a4c66d2a5bacee38b159b52159d SHA-1: 313621a2bb5e848e76822b6e19ae002cf408cc8c SHA-256: 9726acc238d43cb502d81c8b6bbb47bed83316289d6f532beaef23605e7f78c7
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to websites hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the primary attack vector appears to be the embedded link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://topinsolventa.ro/userfiles/file/jipamixuvakipuboxoge.pdf In PDF document text
    • http://antitumor.org/filespath/files/20210815092435.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c41bbdd60---74663849008.pdfIn PDF document text
    • http://sterenstein.ru/userfiles/file/norofefasozumov.pdfIn PDF document text
    • http://riccaassociati.eu/userfiles/files/vofikikozixigulalive.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091f68e9ee33---xusukalexunajure.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/b915a97b69c7c0fe763fa2a14efb5027/14573349453.pdfIn PDF document text
    • http://ainut.fi/userfiles/file/23313651512.pdfIn PDF document text
    • https://oxi-dental.ro/imagini_ws/71841119997.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/sh0ec9acejmulg6kunt7e8po9d/kogefoxiwekukuz.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/280805107542.pdfIn PDF document text
    • https://kop-trans.pl/uploads/userfiles/files/kefubosib.pdfIn PDF document text
    • http://myboydfamily.com/clients/7/7f/7f513a2250c12de81a70a6735749c289/File/mibalekege.pdfIn PDF document text
    • https://q-web.ro/wp-content/plugins/super-forms/uploads/php/files/81nhch34b7j5fsdtq8k509g3on/59545319603.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/r190ri387g0d31ek9d0nnhuj3e/zilusesoniw.pdfIn PDF document text
    • https://cdmsig1.com/ckfinder/userfiles/files/tofufuzajaxu.pdfIn PDF document text
    • http://hrdiborice.cz/erucom1/files/files/zibapibolitod.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/bc46719543c474d3282e3864c67ae41a/62143964009.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b71cc2208---gaxajujet.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/cb5c16b08925a50fdf029c3d151d6c3b/jagarigedulubi.pdfIn PDF document text
    • https://glbtrader.com/userfiles/file/30422661738.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/fafikalupudovuremuxa.pdfIn PDF document text
    • https://ost-fogging.com/upload/files/lalujepukizu.pdfIn PDF document text
    • http://personnelstrategies.net/userfiles/file/51846258230.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=citing+black%27s+law+dictionaryPDF 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_off0000d659.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD659 17816 bytes
SHA-256: 455c5de6f506b3c53cd243980b8e39fc657e2ea2e060c82c1322fc85df6a8921
font_01_sfnt_off000104b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011cc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC8 10908 bytes
SHA-256: 49511ddc3dc909feef1bd987e02d5dad0850ac12d69e6852c67be8516069087b

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