Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f28f9a154f84c56…

MALICIOUS

PDF

76.8 KB Created: 2021-09-18 19:02:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 990b4ac43a97f80ab483eaaf7b7dff23 SHA-1: 9f4b9a3afdb2e67e4b092e40d334465617f7dfc8 SHA-256: 5f28f9a154f84c56e60f5efd29958e4e39078faa31992f40f534b648518df090
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/6c3850b0ea46739872efdd2caedf9907/jetora.pdf
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16145879644cf4---vapatetij.pdf
    • https://prosaison.fr/userfiles/files/pedusifodadegon.pdf
    • https://projetovm.com/uploads/files/13177909433.pdf
    • http://provia-events.de/pics/fotos/1/file/68993225464.pdf
    • http://como.gattinonimondodivacanze.it/themes/userfiles/files/13050545796.pdf
    • http://puntolinea.org/userfiles/files/54081826178.pdf
    • https://sreekanakananda.com/ckfinder/userfiles/files/morowu.pdf
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/3db16d2b7725d5b8603e989922d9685f/18450193993.pdf
    • https://unaizahic.com/Files/files/88161943630.pdf
    • https://hijaustabilo.com/contents/files/19377916814.pdf
    • http://myapartment.de/web/editor/files/51614642856.pdf
    • http://gniortho.com/files/Upload/file/gumew.pdf
    • https://rybczewice.pl/userfiles/file/62896549030.pdf
    • http://thoitranglani.com/upload/files/29503189869.pdf
    • http://cbcom.fr/ressource/site-image/files/29216112008.pdf
    • http://sgadsahodayatarntaran.org/sahodyatarntarannew/userfiles/file/xiludipefovevi.pdf
    • https://wasael.com/userfiles/file/kezepegitugofude.pdf
    • http://yuha.be/_files/file/6002573897.pdf
    • https://mpksieradz.pl/upload/file/97033585628.pdf
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16132c82939d05---48006861040.pdf
    • https://5703n1n6999-6a55.com/contents/files/sutawixeni.pdf
    • http://bsp-oblspl.org/ckfinder/userfiles/files/xonapezuriwexowobufa.pdf
    • http://woodwork.pl/ubezpiecz/obrazy/file/wukixibo.pdf
    • http://xn--hy1bt45apoap01a.net/jangheung/userfiles/file/55429474892.pdf
    • http://urs-certification.com/gais/image/file/92388266125.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=hack+tool+higgs+domino
    • 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_off0000c570.bin
5346e0b5dcf2c8dbabf14b51aea6eef6f4f5e548d62db7c3cd0ac711f7d7c322
pdf-font-stream PDF embedded font (sfnt) at offset 0xC570 18476 bytes
font_01_sfnt_off0000f54c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF54C 16792 bytes
font_02_sfnt_off00010d63.bin
e274e76b8428d1b185e819ff74ddc544e3676c7122777ffad68c07c6a6940a24
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D63 10668 bytes