Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5217ac27826a8fd…

MALICIOUS

PDF

82.0 KB Created: 2021-09-15 11:58:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b798551781d34f473d872056d50c35c7 SHA-1: 16d1476cace3fea4ac35a5dee896e659ef943dfe SHA-256: f5217ac27826a8fd02843172f5f3809d3a1f0f2b234568ae694fef65d413f54e
196 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing or trojan delivery mechanism. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document attempts social engineering to prompt the user to install a browser extension or update. Several external URIs were extracted, many pointing to compromised WordPress sites, suggesting a link farm used to host or redirect to malicious content. The presence of embedded URLs and the overall structure strongly suggest this file is part of a phishing campaign designed to trick users into downloading and executing further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://drafthe.ru/uplcv?utm_term=no+ads+chrome+android PDF link annotation
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/16130981e7fdff---nejesekubez.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613ee72eb4f5f---41293745803.pdfIn PDF document text
    • https://resttour.com/images/userfiles/files/90771951934.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/rhn977kqe6h9t359rm516vdj9h/fogomaku.pdfIn PDF document text
    • https://steammining.com/userfiles/file/fekezemijezipofifuv.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/tokibaf.pdfIn PDF document text
    • https://volnynaklad.cz/data/file/kadadiwew.pdfIn PDF document text
    • http://cn-biyoute.com/d/files/xesarixoxawik.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/sopirerurefawani.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/lapojubetexejoxi.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/161305b77a294a---gulolegopigebafekozemiju.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16135b9a6753cc---24518621865.pdfIn PDF document text
    • http://szerecsengyogyszertar.hu/editor_up/gatudefigobesaginakir.pdfIn PDF document text
    • http://fmmvn.net/userfiles/files/14356496263.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210907/file/zuzuzimuw.pdfIn PDF document text
    • https://cursosadistanciayonline.com/medios/files/84736761830.pdfIn PDF document text
    • http://yunnanyingxiang.com/ckfinder/userfiles/files/38082669458.pdfIn PDF document text
    • https://gregoryshow.ru/files/file/numakebuluzo.pdfIn PDF document text
    • https://leifs-auto.dk/images/file/tipazigarijidumofimogap.pdfIn PDF document text
    • https://duproject.com/uploadEditor/files/rukub.pdfIn PDF document text
    • http://chickenwild.com/upload/contents/images/images/59729415143.pdfIn PDF document text
    • https://www.benkorner.nl/admin/library/ckfinder/userfiles/files/vekebefowadaguneve.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/baab4976b2b274b6dff2636e0341a0a8/98475636230.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_off0000dd46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f558.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF558 17476 bytes
SHA-256: 6c9b099492e193a168afffb60582f8e1d4fc6dd519b52735dbdb817f7c742d90
font_02_sfnt_off000122da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122DA 10468 bytes
SHA-256: 0ffb90cab1aa32cc966f6e994094cf1a3b214f9e477e993294b9bceca5b6a639

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