Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a2fbe8094198a5f…

MALICIOUS

PDF

86.6 KB Created: 2021-07-02 05:58:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 957ad4cc3a24c100afd72d18b0ab4857 SHA-1: 986a654b686cac4b50f7132ef77b1b0ff9221944 SHA-256: 6a2fbe8094198a5f0b73b4be7f31e5163520383ca7f2ee83e0a5cf2a00651214
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 pointing to compromised websites or domains associated with link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure and link distribution suggest it's designed to lure users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://tortugafilms.ca/adminfiles/file/suxisu.pdf
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160dc7a813326a---68353898779.pdf
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160bd295e41f21---gamexaj.pdf
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca0800def0---82914790032.pdf
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608266f4442f0---4469815143.pdf
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/38db7da283a271366548cb2157fb344f/55748198181.pdf
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609bcde5ee113---68372584478.pdf
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/dbde8c469b2a6f4dc28d6cb5e09bcbc0/xanijolufexewevegadimi.pdf
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1c02551aff---65503123426.pdf
    • https://visionbrindes.com/admin/fckeditor/userfiles/file/pidirojajazezito.pdf
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/b7cd5c0a14055e4f8fb4d7d68e497461/99728870981.pdf
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd9e339621---90554669259.pdf
    • http://gapoom.com/upload/fckeditor/file/gikasuwusuxo.pdf
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/361fd8c161aedfd2c837938add165503/61226247063.pdf
    • https://pensiuneavlasin.ro/wp-content/plugins/super-forms/uploads/php/files/ipo016k0e8fii4s0lim6de9hs0/nabejuxaxelagup.pdf
    • http://firewheels.pe/userfiles/file/debeseditunudirami.pdf
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/16083bf62e51c7---kojaguwubekowezinamagisi.pdf
    • http://aeronautike.com/userfiles/file/85103706299.pdf
    • http://travelci.ru/ckfinder/userfiles/files/81183832177.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/i7bg57riaekhc273n65fhfsun1/tisorilofopeduwapovo.pdf
    • http://softwarefactory.nl/images/file/68964657351.pdf
    • http://dioceseofniranam.org/userfiles/file/raxutujomeguxalagak.pdf
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/5c16a52bb6841fcb67edc1d842cfab96/fomupezobupefimuweliw.pdf
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/3dd888e62cc4d3b923a52716857dcb7c/tulewenavudirijonivuwi.pdf
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095dbdc68abc---17817837428.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=a4+size+paper+width+and+height+in+mm
    • 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_off0000eeb7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB7 16792 bytes
font_01_sfnt_off000106ce.bin
9ec448c2ba068c0dedc09ac531d63b6786880feecc0c5059b9de5d47191e4be0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106CE 10880 bytes
font_02_sfnt_off00011fbb.bin
c0feada2ae48da6de9b96587a36068876396e04424b6faffcc6cc1bcee17e61d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11FBB 17316 bytes

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