Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6853bdf420535ea…

MALICIOUS

PDF

80.3 KB Created: 2021-08-26 01:17:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 1ce5ae147e07e995cc0d9e0d23fd6262 SHA-1: 1f97c4210a7167cac6ff8c97813a63a05a0c75b8 SHA-256: b6853bdf420535eab14da0d0b6841936353bae192d1e1633cf19ab8f8f2593b0
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous disposable hosting sites, a common tactic for phishing or malware distribution. ClamAV detected this file as Pdf.Phishing.Trojan, and an ML classifier also flagged it as malicious. The embedded URLs suggest an attempt to redirect users to malicious content.

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://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/k925rl950e2tu8noaglc4u3t2f/nelusoxudowozo.pdf In PDF document text
    • http://hani-bee.com/userfiles/files/girufozavifona.pdfIn PDF document text
    • https://stdtekstil.com/upload/ckfinder/files/pulinajiwesuvepozurob.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/46382465998.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/b430742da621ee3715746d8307eb2728/60231340715.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/8ae4c863c6cf58b6dd071e8f244f211c/xujigoxijolutofo.pdfIn PDF document text
    • https://reitinguok.lt/userfiles/file/14710794378.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608785875726e---69481112485.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd4f3620cdc---bemus.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/63572485310.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160977b08a7b24---31752179050.pdfIn PDF document text
    • http://novichiha.ru/pic/file/siwowobununuzar.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/icf0ndfilpunp3bndksjse996b/54922452800.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607aad7ceeaae---229918111.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607920e38fb64---41318732311.pdfIn PDF document text
    • http://studiotecnicobonoli.com/userfiles/files/38687750318.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/6850f2876a0d469a38a967f6971a85a5/disuwurinulaputarinibef.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/752cee5c761e870e3986b79b2312c31e/fenoripefolexafope.pdfIn PDF document text
    • http://talleresjpg.es/img/file/kefebejaxevatulinujojimi.pdfIn PDF document text
    • https://palezieux.com/ckfinder/userfiles/files/36859229024.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/20682850095.pdfIn PDF document text
    • http://pokewaveanaheim.com/uploads/files/nedumawunijedotovalig.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/282fce26ddb18f5755a28ec4295d6148/89504500721.pdfIn PDF document text
    • https://daynexweb.com/upload/ckfinder/files/81326820019.pdfIn PDF document text
    • http://beta-rc.com/upload/files/82033699679.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=continuous+and+discrete+signals+and+systems+soliman+solutionPDF 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_off0000d499.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD499 17316 bytes
SHA-256: 30536d80fa53295f90e766c7712c8e4dce19ee15772f4dca912c5035e0835cc2
font_01_sfnt_off000100b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B7 10960 bytes
SHA-256: 545cf61c998dac8cd254f713ba7310ebe1e9f8d8fb5695cbe3cd795522e95e0a
font_02_sfnt_off000119ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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