Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cabbb24fafa5dba…

MALICIOUS

PDF

87.3 KB Created: 2021-07-13 21:28:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c7fc0d5c37d6f3a6b5b643b3c81dc797 SHA-1: 477c2d8c828bc4bfb3256542abe445a7bfffcbe6 SHA-256: 5cabbb24fafa5dba0913f6dce4e149d537d546918c98c2fff69cd52dba428288
196 Risk Score

Malware Insights

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

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious. Heuristics indicate it uses a browser extension installation lure, a common social-engineering tactic. The document body is heavily obfuscated, but the presence of numerous external URLs, many pointing to compromised WordPress sites or disposable hosting, suggests it is designed to redirect users to malicious sites. No scripts were extracted, but the overall pattern points to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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=editable+sign+up+sheet PDF link annotation
    • http://pinxedien.net/upload/files/fonomusamixapozu.pdfIn PDF document text
    • http://usmleworkout.com/files/file/xekerege.pdfIn PDF document text
    • http://hondasushi.com/uploads/files/33773842578.pdfIn PDF document text
    • https://lemanssrl.it/file/66133453563.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5cd40a9ec---takew.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608b991306d2a---28811598641.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/76e68d093450c3e7fe0af39a0a8f527f/63084106958.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/18529221631.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/86440496719.pdfIn PDF document text
    • http://hotelclinton.it/userfiles/files/61807086175.pdfIn PDF document text
    • https://hizlipin.com/calisma2/files/uploads/5359561954.pdfIn PDF document text
    • http://monkeytailranchdonation.org/clients/e/e8/e82116dd0b5861b0917add2a69208af2/File/kadajezumofaropudixigoge.pdfIn PDF document text
    • https://euroroma-bg.org/files/file/79394171748.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160856f071664a---70808623100.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607801e965e65---53311976111.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609835a33534a---bisujote.pdfIn PDF document text
    • http://debden.org/userfiles/file/43870847044.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/00450f795bfdbd6524642c1407b70d8a/zanovit.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/5bu043o30dqrb6bd7o5n41nvkg/mudexuzasasodi.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a223b83e363---10842059410.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/db87e607820421f8bf256b8a8556adaf/xujibimeposa.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/8eeaa4d5093f0454f6e9ddea14cc50f6/7861702548.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_off0000f212.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF212 17580 bytes
SHA-256: 3824cd59596b941c366240715617e94c2ec812cfbb70c6533a684fe03bc6eba7
font_01_sfnt_off00012055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12055 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001386c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1386C 10676 bytes
SHA-256: 141ba937bc5394284ee988c0379ee2039c5714405d89b5fb672330f454ca4c8d

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