Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c38f72064725533…

MALICIOUS

PDF

67.4 KB Created: 2021-09-20 03:02:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ca94b7e4ddc4b246c660e6eb19322670 SHA-1: 0c47966588a619cddc7ea930fd14437544f01b6f SHA-256: 5c38f72064725533cbfec47a0401d4958e6c58efb8b2a7d32faa0610b8becbb0
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as a phishing lure due to its image-heavy nature and embedded links, a common tactic to deceive users. The ML classifier and ClamAV detection strongly indicate malicious intent. The document contains numerous links pointing to potentially compromised websites or disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 1 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://archiw.gbpopatowiec.pl/img/upload/files/bugemasolojoleji.pdf In PDF document text
    • http://tischlerei-schlusche.de/sites/default/files/file/folunuxiloxaze.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///202191522299854.pdfIn PDF document text
    • https://vntdc.com/upload/fck/file/degirexebojupinuraxelusa.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/16147c08218efe---pisanesetetiwugale.pdfIn PDF document text
    • https://www.mediawerf.nl/bundles/store24backoffice/ckfinder/userfiles/files/pavuvofaginexefilefito.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/24563395353.pdfIn PDF document text
    • http://gzmzwl.com/Uploadfiles/files/murum.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/161382fac78a3c---furof.pdfIn PDF document text
    • https://arhometutor.com/userfiles/file/rerud.pdfIn PDF document text
    • http://hbaoge.com/upload/files/pimoxulivimovigitokolal.pdfIn PDF document text
    • https://bharatceramics.in/ckfinder/userfiles/files/kijebupenabaluwi.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/ht2gvnla9cm2srv3cngci5ecu3/67137559771.pdfIn PDF document text
    • http://biosystech.com/pdsFck/file/8834678611.pdfIn PDF document text
    • https://dazhonghua1688.com/ckfinder/userfiles/files/64823250238.pdfIn PDF document text
    • http://archive-2014.humandoc.pl/attachments/file/12795122365.pdfIn PDF document text
    • https://nepalonlineexam.tisaracademy.com/userfiles/files/bufexulepepalijiw.pdfIn PDF document text
    • http://azizolace.cz/images/file/18854104002.pdfIn PDF document text
    • https://homestayhoian.thamtuddt.com/uploads/image/files/50866463617.pdfIn PDF document text
    • http://irfanmakina.com/depo/sayfaresim/file/xupelidapokazetegebexege.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f260d7e46f---55760475684.pdfIn PDF document text
    • https://thegmsbihta.in/userfiles/file/nanobukusevexaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+download+happymod+on+androidPDF 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_off0000ad3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c54f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC54F 14148 bytes
SHA-256: eeedbee82c7c46fbc7a2288468c97df8472b09a384781fd3b7f3700d56f2380f
font_02_sfnt_off0000e88d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE88D 10548 bytes
SHA-256: 0462c401049d9b9366ff44c2028c7663c49754ddb1fec52061ca0196cc836aa3

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