Malicious PDF — malware analysis report

Static analysis result for SHA-256 d428fc6ddeead77d…

MALICIOUS

PDF

99.5 KB Created: 2021-06-28 02:03:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 25cdbcbce0631403a3225454492a8220 SHA-1: 7ed2828a9f4a61fdda9029048fe6263ded5165da SHA-256: d428fc6ddeead77d7dd425056b3a7012ff5ed69ae8e87f7a6eb96ee2d84a5abb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing trojan by ClamAV. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable hosting, likely intended to lure users to malicious content. The presence of embedded URLs and the nature of the link farm suggest an attempt to distribute phishing or malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9784

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=army+abbreviation+for+staff+sergeant
    • https://clifestyle.net/uploades/userfiles/file/97035892404.pdf
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/ru5qrgqs10jcc6iniljpeeslv2/fadux.pdf
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/7slcjp8h5hgil432nn08pg7hv1/zuxifof.pdf
    • https://fier-forjat-valimet.ro/ckfinder/userfiles/files/pifojux.pdf
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/4e55dc015bd1bc22804f27a5cdbd62c6/viwilavomamipeju.pdf
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/89b6e11bf8af10f4a99a85b73a5938c2/49824359065.pdf
    • http://geredekombiservisi.com/userfiles/file/xewobajup.pdf
    • http://amsasecretariat.fr/userfiles/file/nakutokos.pdf
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609073f981066---28069575695.pdf
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a99ce870efd---pezoxaropodavotimarolar.pdf
    • http://kasystemofkarate.com/clients/861259/File/xuzanovilix.pdf
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/7uq41cm03e6p3i82alr3n6bj70/kilove.pdf
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160c0c6c7849f2---poneperuludogus.pdf
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160998681b4418---fitexafebexuzu.pdf
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/tlf080rk9ciulhq2defs3qvm71/26316671404.pdf
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/b77ce3d3b37fca336c8f0bff25c1a3a8/buxunarimumonozi.pdf
    • http://dioceseofniranam.org/userfiles/file/65293439389.pdf
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/526a72dea5ab861b736d0783d3652eda/lufoxomepazenevetobaxavak.pdf
    • https://cualuoihoanmy.com/uploads/userfiles/file/56903826251.pdf
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2a0ccb9e08---38412161450.pdf
    • https://ludifrance.fr/userfiles/file/voruwupirawezovesig.pdf
    • http://jump360.co/upload/files/20210616001313.pdf
    • http://aksaaydinlatma.com/img/editor/image/file/54856587238.pdf
    • https://markmont.eu/editor_uploads/system/files/79093604115.pdf
    • http://clinicaveterinariaalbese.eu/userfiles/files/78343309360.pdf
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088b111ba891---vekevopobe.pdf
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607575cf8ce18---lelubovubigefavunosiwu.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_off000123c1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x123C1 16792 bytes
font_01_sfnt_off00013bd3.bin
aee41f1b1430e572a8fb7ce87bb52a9d10c4b0a7a71fd4581bbc174bd33c0a93		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13BD3 16640 bytes
font_02_sfnt_off0001675a.bin
b54e225db2331b921eda880c7ad4955226445bf61fe739140805747a260378e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1675A 10812 bytes

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