Malicious PDF — malware analysis report

Static analysis result for SHA-256 55186a171154a664…

MALICIOUS

PDF

91.7 KB Created: 2021-08-05 07:50:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 71d29b850d16c6c5c7ce3beb7ea80411 SHA-1: e2fb1400d6aeb89e21c75ec151d9cfd311d4a01a SHA-256: 55186a171154a664de9e0d22b96e3e0b36ef7f36834c55ea5458a11f7c59e653
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous external URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to exploit users through social engineering or to deliver further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://huntic.ru/uplcv?utm_term=%D1%80%D0%B5%D1%84%D0%B5%D1%80%D0%B0%D1%82+%D0%BB%D0%B8%D1%85%D0%BE%D1%80%D0%B0%D0%B4%D0%BA%D0%B0+%D0%B4%D0%B5%D0%BD%D0%B3%D0%B5+%D1%81%D0%BA%D0%B0%D1%87%D0%B0%D1%82%D1%8C+%D0%BC%D1%83%D0%B7%D1%8B%D0%BA%D1%83
    • http://shipagents.nl/uploadfiles/file/kutoseraf.pdf
    • http://teormech.ru/teormech/usrimg/file/detivojujopewa.pdf
    • http://amon-syotengai.com/userfiles/file/11089722673.pdf
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/a39361391f6a8c6c3a561407b1e606df/53470819594.pdf
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/032c44911aefaf0047cfbccb965d2028/26507031634.pdf
    • http://vrieshorst.nl/images/uploads/file/zebiwub.pdf
    • https://shiokuda2.com/contents//files/nufixiwebesuxadololutobel.pdf
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094cd84e993b---vizar.pdf
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/47088a619a7525866f393905ec0ccb6f/lojukafixuf.pdf
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac5f9d8a599---33742363872.pdf
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/8d98ad0d0ede798ae795da25a9ddae03/tususediva.pdf
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16092a4f79e093---75965905597.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/uvph62pbc782d2fn2jvqoijf6s/rapowipoko.pdf
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/e151820cc070794b2cc0bc757f4f1083/mosetosiwoz.pdf
    • https://marblobaths.com/app/webroot/img/files/22293001276.pdf
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/4lh89lu6bktlktm7vrfbmjh3po/muroxazafabisavisi.pdf
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160700d83714cd---31371778034.pdf
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/cb8c0c4c8e4b3eee22f7f0953282f2f9/xixesulowilitaxorasirole.pdf
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/2abd477b06b152c9ffcb6d2b45582a0e/kukodevuvezaboreputon.pdf
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/ab7d2a490ce9b0cad5974751292e260f/femekafirilusevozap.pdf
    • https://tedvandergulik.nl/userimages/file/piwedenejisufenumosaw.pdf
    • http://tamker.hu/userfiles/file/poman.pdf
    • http://thedewakohchang.com/image/upload/File/2209921501.pdf
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/2llmb40oif71h8qqqjqhts4c7h/80184504653.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2bb.bin
246b8c386db04aa16b2d4ee9b1d2e6148e23593408f73468a3782fcaee614db7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2BB 22596 bytes
font_01_sfnt_off00012aab.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12AAB 16792 bytes
font_02_sfnt_off000142c2.bin
f6c2af94883d8edbccd28a74045bcc6455bd927ee448b5a022ca5f3824256af0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x142C2 11392 bytes

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