Malicious PDF — malware analysis report

Static analysis result for SHA-256 23d8f1b3573d421d…

MALICIOUS

PDF

120.1 KB Created: 2021-06-18 20:07:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 29494fc3e6a11876d568183046197ede SHA-1: 17fe487bad354a14cfd629f975147e57827a7bba SHA-256: 23d8f1b3573d421d5788b641df565b732587d3ece50c88c147f2f6ddbe3c3030
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress sites and utilize UTM parameters, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated and unreadable, but the presence of external links is the primary indicator of its malicious function.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://medvor.ru/uplcv?utm_term=michael+j+fox+young PDF link annotation
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/a23974bbfe30ea6f7adbf449fc5cd633/duditidodanojosaxekefujil.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607625b776067---xobapalagefe.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/23450263307.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac20aeb9137---90759082549.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/802b2108b2cb2076f3b387fee18b0904/gixijupufuvapenogu.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/e254bb61ebfbbcc3aefdaa48090187b0/53270965036.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/48b16a2ccdff0d20252465f76da10091/simavewaled.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acf27d5bec8---tamajatomuwelozikumibup.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/fobaxafowesadaxelekax.pdfIn PDF document text
    • https://castel.ro/userfiles/file/93498565006.pdfIn PDF document text
    • https://arket.io/wp-content/plugins/super-forms/uploads/php/files/tpp6p6i40boott45s1ka9otab6/temarukivojoratu.pdfIn PDF document text
    • http://ladyqueen.it/userfiles/files/78354176474.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/dokidagagugopowibavoti.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074990a9e5d7---39871592382.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/23436463230.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00019804.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19804 5120 bytes
SHA-256: 50144443d06a0a2b0b17962e4888e2370b3f4b3ed0703cfeb4f9a6d1ae3c52b9
font_01_sfnt_off0001a99b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A99B 12988 bytes
SHA-256: c7ae3267231d6d0e1a9f59e945b2760c9641876ce971867f6600cc1623394ef6

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