Malicious PDF — malware analysis report

Static analysis result for SHA-256 18646bb12fb6339a…

MALICIOUS

PDF

79.1 KB Created: 2021-08-18 19:49:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7526de08b298401e07556753b4c3ef39 SHA-1: 88bf5fd7c624c9ed736bbc12b266bdc0b465e7be SHA-256: 18646bb12fb6339a52c94b4490db03b04e030dc6f49e822a3f5281f756d416fb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to distribute malicious content. ClamAV detected this file as 'Pdf.Phishing.Trojan', and the ML classifier also flagged it as malicious. While no scripts were explicitly extracted, the structure suggests it's designed to lure users into clicking through to potentially harmful URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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 http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ea6ad1fd39---16911183031.pdf In PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081f3fa7098f---98972404286.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/wisuvupos.pdfIn PDF document text
    • http://petersonspann.com/clients/3/32/32c4b2f41fa698b5b938e848169c8dcb/File/pexupi.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/96ovgsgghhj8cputoqco8p1rqo/39044398853.pdfIn PDF document text
    • http://imssp.by/data/images/fxeditor/file/88080633701.pdfIn PDF document text
    • http://tavaszitura.eu/userfiles/files/mapifuzinijenozav.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b08422eba3f---24638392650.pdfIn PDF document text
    • http://sapaelitehotel.com/webroot/img/files/miminewimekulugum.pdfIn PDF document text
    • http://bjsprt.com/uploadfile/file///2021062805383729.pdfIn PDF document text
    • http://slstudio.it/userfiles/files/guwefemeropologuger.pdfIn PDF document text
    • http://weingut-suppan.at/files/wanepeponamajot.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16110269eb2403---5978787254.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/hvmb4a1comi71o9ukhmro0f4r9/17853915221.pdfIn PDF document text
    • http://stlukesmn.org/clients/17773/File/padinadoduzuviwagitegutor.pdfIn PDF document text
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/gabejegukavowi.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/68834582285.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/ru84p62d48sd8qbvgs17ngohda/61892093581.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/5fdbf566b4cd3fe3ba2e1bbb63bad496/mozowiratikokinaretupikak.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160f263b80deaf---xikokigamezig.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/nimam.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/96694883412.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609c45a258d49---55658396524.pdfIn PDF document text
    • http://prestopc.it/upload/file/lulivifidoleraso.pdfIn PDF document text
    • http://acm-medicali.it/userfiles/files/46720027892.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/7577d94fce45e06290932fe5f1b6a3f2/fukiberevok.pdfIn PDF document text
    • http://rld-carbon.ru/file/binavo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=ejercicios+resueltos+biologia+genetica+4+esoPDF link annotation
    • 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_off0000ce9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE9A 17456 bytes
SHA-256: 6f99d2eb5f02641d8562d305c3e275eb3423a0724f9b3a09e567529a7c6eecce
font_01_sfnt_off0000fb1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011335.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11335 10836 bytes
SHA-256: bf465704bbacc42e8a5025dd7c24ed162f90582824db2a105a8dbc3895af1468