Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdfe612f73460cc1…

MALICIOUS

PDF

69.8 KB Created: 2021-09-24 20:57:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: df86b51f37a18115f79c5721393ce938 SHA-1: 8840b3ca4f766832d8067b7097ebf7c4278583f3 SHA-256: bdfe612f73460cc1fd9eb74e554de08f00170a9937e5fd4a3dd4a100d3404cc0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://allytemp.ru/uplcv?utm_term=kambi+kadha+pdf+download+malayalam PDF link annotation
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/a32042735e6a4227afd78732f53bd7c3/sekinituzulu.pdfIn PDF document text
    • http://intertexmedical.com/userfiles/files/47216144699.pdfIn PDF document text
    • http://spyboarcams.com/files/nawarimixusesitotav.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/45294942373.pdfIn PDF document text
    • https://medius.sk/userfiles/file/21469741431.pdfIn PDF document text
    • http://adec-interiors.net/Uploads/file/wanivuvolonizefev.pdfIn PDF document text
    • http://planbmedia.hu/files/dowatu.pdfIn PDF document text
    • http://aloisiquadri.it/userfiles/files/duvurapida.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/39531502554.pdfIn PDF document text
    • https://sanruouvang.net/images/uploaded/file/nuvefesilokegi.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/da1621bfd22c7add26c1c375270e2f6c/24895165479.pdfIn PDF document text
    • http://hospitalityroyal.com/upload_files/file/dogalutumari.pdfIn PDF document text
    • http://bhk-aindling.de/userfiles/files/85350340195.pdfIn PDF document text
    • http://antitumor.org/filespath/files/20210923034624.pdfIn PDF document text
    • http://faizleathergloves.com/userfiles/files/puvaw.pdfIn PDF document text
    • http://trevelsi.ru/ckfinder/userfiles/files/zuviguwugefoloruxi.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134af4a72b03---64957168566.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d6c325ff56---redadedof.pdfIn PDF document text
    • http://przystaneknida.pl/data/aktualnosci_imgs/file/zobigolevumanujez.pdfIn PDF document text
    • http://dilimkebab.com/userfiles/file/47393163520.pdfIn PDF document text
    • http://kjphotocon.org/data/userfiles/files/favenijexowi.pdfIn PDF document text
    • https://gornjastubica.hr/files/zijazogofafaxigejapu.pdfIn PDF document text
    • https://www.esfa.bg/root/ckfinder/userfiles/files/9710061638.pdfIn PDF document text
    • http://volvo-cars.jp/js/upload/files/fifajalivosabawoz.pdfIn 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://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_off0000b29b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB29B 15336 bytes
SHA-256: 6a1371219949af14f046487cf537319b3f0d035994f6d18d7b4e2160b7c79c10
font_01_sfnt_off0000d98c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD98C 10688 bytes
SHA-256: 6297a9c179e10e0c86bd4f73e321b5ce295a519d91432a600d4e0d2ad3d11262
font_02_sfnt_off0000f194.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF194 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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