Malicious PDF — malware analysis report

Static analysis result for SHA-256 42b897b9483cd4fc…

MALICIOUS

PDF

89.9 KB Created: 2021-08-12 12:44:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3274186e24c6d42b15496fca4e38f037 SHA-1: f647cbb9fb9c24dfc688fc8bd804c5a9b92b2cdf SHA-256: 42b897b9483cd4fc9af2c9c6c3fa72ada942307f11912dbe7f9ab558c6d0e120
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farm heuristics, indicating its primary purpose is to redirect users to other sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://catamma.ru/uplcv?utm_term=trucos+rambo+3+sega+genesis PDF link annotation
    • http://alptw.com/images/files/vezamowizodeputa.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/70ae726579f2d8f14ebe0fd00ccd28f4/bavupiv.pdfIn PDF document text
    • https://ruxthai.com/ckfinder/userfiles/files/pogarelubuvarawiko.pdfIn PDF document text
    • https://tennis94.fr/img/pics/files/93805442090.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/d9bfb7a62ed1354c7a51eb5451d68a62/fuzifuligewirowewovufi.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a999235b772---rixiwetatudamiwomeg.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b723885a7de---fivojekamufubebo.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6665b250f---kinujo.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160760f1e0646d---74247783055.pdfIn PDF document text
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/piruko.pdfIn PDF document text
    • http://suamayin.biz/userfiles/file/53960524150.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608076d9bb30e---17255080987.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e70902170e---vimovoj.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/resilova.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/12553529622.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f9ebd4f5c---makobewut.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/kotazixid.pdfIn PDF document text
    • http://poorclarescork.ie/images/xebutufor.pdfIn PDF document text
    • http://poketomecam.com/uploads/files/15384390499.pdfIn PDF document text
    • http://campbellelectronics.com/uploads/jexufimifosojetujegurutu.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/m5itk7oocib20b5d08gv15203h/74167114530.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/fogumolejepu.pdfIn PDF document text
    • https://recapress.com/ckfinder/userfiles/files/xateb.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160c02b59db597---78864180120.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_off0000f726.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF726 10804 bytes
SHA-256: ae35f6fc44902ab18a6da6e5ca2f80a0f203b8c32339676cff27c5816f429f67
font_01_sfnt_off00011011.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11011 18900 bytes
SHA-256: deef3f979d57f1a178de60b2a3bd50cfaaa6391858f6ffa44d84371eca177348
font_02_sfnt_off00014024.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14024 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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