Malicious PDF — malware analysis report

Static analysis result for SHA-256 03d9cc87cf02df65…

MALICIOUS

PDF

82.0 KB Created: 2021-09-16 21:00:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0ec8ca0b4896244eb07f02f6d353f948 SHA-1: fe9416b559f1668160b27db5e91e156f19eed516 SHA-256: 03d9cc87cf02df650878d9fee23c6054fd79d8574cfaa5e7133722831b5a94ef
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF document was flagged by ML classifiers and ClamAV as malicious. It employs social engineering lures, specifically a browser extension/update installation lure and an MFA/one-time-code harvesting lure, indicating a phishing or credential theft attempt. The document also contains numerous external URIs pointing to potentially compromised or disposable hosting, suggesting it is part of a link farm designed to redirect users to malicious sites. No scripts were extracted, but the PDF structure and heuristics suggest it is designed to exploit user trust for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://synerhu.ru/uplcv?utm_term=how+to+stop+chrome+notification+on+windows+10
    • https://albawadiroad.com/userfiles/files/xerixixiwalebofemejedatad.pdf
    • http://studiogiamberardino.it/userfiles/files/92088126275.pdf
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/ef5628c93ca6c789f4ad36604c71d688/mebevalesofuda.pdf
    • https://tlproduct.com/userfiles/file/wulaxak.pdf
    • http://hyundaidongdo3s.com/images/files/futibevutawa.pdf
    • https://pleasanton.com/wysiwygfiles/file/lujoduf.pdf
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c63a17c289---mokuzaxofinatonegetisoli.pdf
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/9084f262b204e3e7b2b361c3fdff8994/tetuf.pdf
    • http://koryosushi.com/uploads/files/bemodawewaxezonizi.pdf
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132f5dab94c1---sokopuwewowabodaxugerepiw.pdf
    • http://kbidc.kr/upload/editor/file/1631416663.pdf
    • https://yocarbroker.com/upload/ckfinder/files/povimugekexenuf.pdf
    • https://girl0229960192.com/upload/users/files/vulimuki.pdf
    • http://mail.teleserviciomalaga.com/ckfinder/userfiles/files/vurulux.pdf
    • http://zsdbiopharm.com/upload/files/mipubipekovasonivujibepij.pdf
    • http://gsmontaggi.it/userfiles/files/kuvokulotugujonuxedir.pdf
    • https://uudanbury.life/files/file/79982100385.pdf
    • https://seo-methodes.com/userfiles/file/gudelonujomerilunaka.pdf
    • https://phr4u.com/files/forarosarisegib.pdf
    • http://dongduong.net/Images_upload/files/vadarivolejoge.pdf
    • https://ukmriptek.org/codeIgniter-hmvc/userfiles/files/takawusatavipot.pdf
    • http://studiocalcinoni.com/userfiles/files/81503963944.pdf
    • http://www.sandipmallick.com/fckimages/file/77773555368.pdf
    • http://tcgardening.com/userfiles/file/2021091022290673499.pdf
    • http://cartopack.com/Images/file/buzuxizejazigubi.pdf
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5a032d52c---nurakowutebetatogedisumuv.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_off0000daea.bin
5dcd2a5736175c07dd3c1d210eb7f7f8a3086a1aac959f4c89ccce9f3e88938b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDAEA 11092 bytes
font_01_sfnt_off0000f4ad.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AD 16792 bytes
font_02_sfnt_off00010cbf.bin
316afbcb952a29e5300a838bb86ad049cd0a71d5bb7c8b8939af65078d0c4e5f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CBF 17528 bytes

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