Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2d57ad5038bd816…

MALICIOUS

PDF

77.9 KB Created: 2021-09-23 17:20:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5c6e30bf11b2f46eb7d995d1e48cdf40 SHA-1: 392f8fc3cb44057ede69a9d3b363f27d6002c08b SHA-256: f2d57ad5038bd816659bca636096c9d492ed01dca87381b0813df5c7245b3d9d
196 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm and employs a social-engineering lure to prompt the user to install a browser extension or update. While no scripts were directly extracted, the nature of the lure suggests it aims to download and execute a second-stage payload, likely via JavaScript exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://irlanc.ru/uplcv?utm_term=pdf+to+excel+format PDF link annotation
    • https://bangvetthuong.com/luutru/files/55200001869.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff5eb2bd0b---53580653587.pdfIn PDF document text
    • https://aordonez.com/images/contenidos/files/90130922230.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/64275384464.pdfIn PDF document text
    • https://www.agcontraincendios.es/ckfinder/userfiles/files/najejugu.pdfIn PDF document text
    • http://thepnguyentran.com/media/ftp/file/ledug.pdfIn PDF document text
    • http://fazendasaojudastadeu.net/fotosempresa/files/90169504773.pdfIn PDF document text
    • https://cplastik.com/data/cms/file/mivajegebamomaze.pdfIn PDF document text
    • https://tucarrorentacar.co/ckfinder/userfiles/files/23542791901.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/nmjklef280ul6brmapn8b1dbbk/fewetunaw.pdfIn PDF document text
    • http://loaamtran.com/files/usersfiles/files/81173797626.pdfIn PDF document text
    • http://elitsatodorova.com/uploadfiles/file/56590238950.pdfIn PDF document text
    • http://sarljarry.com/userfiles/file/92205660809.pdfIn PDF document text
    • http://escritacontabilidade.net/fotos/news/file/purifawam.pdfIn PDF document text
    • https://giraffeng.net/infodaily/gen-ckfinder/userfiles/files/1724428109.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/fa5e58aa0302088edc8f60826dccfbea/nokomeda.pdfIn PDF document text
    • http://taispacedesign.com/upload/files/jaxorad.pdfIn PDF document text
    • http://patroha.hu/file/96398466718.pdfIn PDF document text
    • http://xn--90afqerdlt1f.xn--p1ai/admin/ckfinder/userfiles/files/jotelepu.pdfIn PDF document text
    • https://tipresentoio.it/images/file/soragame.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/fakimibabosomatixalabeb.pdfIn PDF document text
    • http://chayka-svg.ru/files/wetonebagunapowos.pdfIn PDF document text
    • https://alsultantrading.ae/userfiles/files/xeveva.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/36066118654.pdfIn PDF document text
    • https://almavilag.hu/files/files/motenif.pdfIn PDF document text
    • 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_off0000cc2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e444.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE444 10376 bytes
SHA-256: 1bd42db64a106600386fa050f8cbcf0b6652bd9098c37b1abf2b7795ab3d48e2
font_02_sfnt_off0000fbcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBCD 17928 bytes
SHA-256: 9cf7da56a6c86e2bdde61888e5418192291f5319b1998b0a8bdd75ea1ea3b2c2

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