Malicious PDF — malware analysis report

Static analysis result for SHA-256 e92b2e5d6b1c77bb…

MALICIOUS

PDF

88.9 KB Created: 2021-07-23 09:00:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5a3b6c72bcbb2b54c8d66c59c48d1cec SHA-1: 09e6c1dfcdedac1311bda0064149e9f48ac70027 SHA-256: e92b2e5d6b1c77bb2d7bf86d8d9b5cb9c6959a88f225561ee08b193ad62ef1c1
156 Risk Score

Malware Insights

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

The PDF file contains a link farm that redirects to multiple domains, many of which are hosted on compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded URLs and link farm structure suggest an attempt to lure users to external sites, potentially for credential harvesting or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://ketdoanbus.com/webroot/img/files/73780671423.pdf
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/f5f9aecf3d08aab0789b2272d8b770cd/bikugeludolusidozezesuvoj.pdf
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/b1t1b06utjkqiovk21dh2fvf97/tavaz.pdf
    • http://kulturazebrak.cz/userfiles/dipito.pdf
    • http://gima.ge/admin/ckeditor/ckfinder/userfiles/files/pirokovodatadivel.pdf
    • http://thehonourride.ca/clients/c/c2/c2a221447f3e921143a55eca482c8289/File/wefaxafexofexobiwu.pdf
    • http://svatba-emi.com/uploads/pages/files/19259483328.pdf
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/nl99qre8aboi3evarncr9q9dpe/vunideniwafokob.pdf
    • http://buchtel1967.com/clients/26382/File/75410126173.pdf
    • http://gtshotel.it/images/file/tegutepadagafurix.pdf
    • http://bogaarchitetti.it/userfiles/files/43608158647.pdf
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/31df73a79b6c87a9cefc0af3cfa4f142/xakisafu.pdf
    • https://aslplastic.com/ckfinder/userfiles/files/23815125347.pdf
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a6bbf6d8366---92720641922.pdf
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/d36771785831f5c7449a7259b92911e9/67941693024.pdf
    • https://annjulieskarpmo.com/userfiles/file/10446213589.pdf
    • http://ciaooo.ru/uploades/userfiles/file/deguwajobetud.pdf
    • https://rdsdealers.com/ckfinder/userfiles/files/pixejasobugajoj.pdf
    • https://bahamianbrewery.com/ckfinder/userfiles/files/liwuboloxifosojejazurep.pdf
    • https://airshow-bg.com/file/80443258917.pdf
    • https://italvaping.com/file/fotojidisiwur.pdf
    • https://mo-space.space/web/img/podborky/files/48938326564.pdf
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a8b83da3899---gumezexej.pdf
    • https://churchofgodinjamaica.org/app/webroot/files/ramifotumuvizutimeleditap.pdf
    • http://sakra.sk/storage/file/80481350651.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=how+much+caffeine+does+a+cup+of+hot+chocolate+have
    • 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_off0000f536.bin
3fb06e7c2fc3a7b9b6c8dfc3a0e319fcc2196ee7e23b9574e27e2ec307924ebf
pdf-font-stream PDF embedded font (sfnt) at offset 0xF536 11028 bytes
font_01_sfnt_off00010eb1.bin
343080189e5d9c482f035acc7d93791c4331cd9ba54e6c2b11466ffaaa921bc4
pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB1 17912 bytes
font_02_sfnt_off00013d04.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13D04 16792 bytes