Malicious PDF — malware analysis report

Static analysis result for SHA-256 00f435f8468bf338…

MALICIOUS

PDF

84.1 KB Created: 2021-09-17 16:18:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 087ea058b0a3e09909cca686531eb399 SHA-1: 3af413973f8f787a233d829e3a36cf9998dbbe58 SHA-256: 00f435f8468bf338b94f0e3eee8d18e004ba2fab5117d0d988c60b74a53c5880
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://oniceh.ru/uplcv?utm_term=how+to+know+who+watch+your+instagram+profile
    • http://manhchenang.vn/webroot/img/files/25934642238.pdf
    • https://holcom-wd.com/webroot/img/files/dafot.pdf
    • https://rts-wm.com/ckfinder/userfiles/files/71070134988.pdf
    • http://www.scea.edu.mn/ckfinder/userfiles/files/87514915035.pdf
    • https://atvatextile.com/upload/ckfinder/files/76998178563.pdf
    • http://poketomecam.com/uploads/files/32638111845.pdf
    • http://hc6999.com/userfiles/files/16920831071.pdf
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/161321cb1265f6---pedef.pdf
    • http://www.premiumimport.nl/ckfinder/userfiles/files/86894584011.pdf
    • http://execdentalclinic.com/uploads/ckfinder/userfiles/files/kivabedip.pdf
    • http://www.polni.si/Images/files/85480451126.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/m9brj1090b86bb98pr9sr6pt5n/25640629211.pdf
    • http://sinorarechem.com/upload/files/79617336245.pdf
    • http://taxfreepoint.com/file/38982533908.pdf
    • https://www.willmarshelter.com/ckfinder/userfiles/files/vapelanipitok.pdf
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/c2p8ufj6gme51jkp8dv3leqcgb/rudemekupalovutij.pdf
    • https://seedomoretravel.com/files/files/lunesusozofiwajuperux.pdf
    • https://ncltandatbar.com/home/ncltandat/public_html/dowalumniusa/ckfinder/userfiles/files/wubibarexuravojodifikuza.pdf
    • http://cukorbetegshop.hu/files/gorofepenusubumegujoda.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16138e06cba899---fukizumuvavelovalep.pdf
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/036eddc4c5bb62c8d738d5149ccb0d2f/17061020706.pdf
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/161436b0ba455b---vasudusazewubojidazuzuroj.pdf
    • http://rqconsultores.com/userfiles/file/75524570179.pdf
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/d1e770d312765095d5e2719ca7e57868/60404721840.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_off0000e1d1.bin
ff469ced727c02c43627de22b1bb3143f120186b7346f4cccc038e365bcc609f
pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D1 11312 bytes
font_01_sfnt_off0000fc4e.bin
c5d72636c7fddb3830b733ae7e8e011f636cbc514c07bab95f328a1264d3b2ef
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC4E 18100 bytes
font_02_sfnt_off00012a71.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A71 16792 bytes