Malicious PDF — malware analysis report

Static analysis result for SHA-256 34f8546bdad27eb0…

MALICIOUS

PDF

74.8 KB Created: 2021-09-03 06:47:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 79e69b2100470a46e4aea30e56764e82 SHA-1: 692c69b42fbd9355a63661fbb1ff77a5cc562fd9 SHA-256: 34f8546bdad27eb0059af67ceb41cef710a04899177b44b3442f2d6aee26b3e8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and links to compromised WordPress upload storage, suggesting a link farm designed to redirect users to malicious sites. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves directing users to external content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9914

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://allytemp.ru/uplcv?utm_term=mini+cooper+countryman+2018+manual PDF link annotation
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/e19e6471d954897b0b6b27dbc645bd5c/29184978885.pdfIn PDF document text
    • http://odesignlab.ru/admin/ckfinder/userfiles/files/fajelonoriboko.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/veposazexoxajuwi.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f59312a13a---61842720011.pdfIn PDF document text
    • http://buyo-g.net/userfiles/file/29920825528.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a6adada99e2---xojizoduzijerepizif.pdfIn PDF document text
    • https://retake.dk/ckfinder/userfiles/files/zufosiwaxidaguwevunifor.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/iq5gbodcvk63341or8u0mie444/36856473799.pdfIn PDF document text
    • https://cryptoshift.be/anaeter_capital/siteadmin/userfiles/files/bimunesudagefakorowen.pdfIn PDF document text
    • http://talleresjpg.es/img/file/93499210872.pdfIn PDF document text
    • http://scandirent-new.ru/uploads/assets/file/77917648220.pdfIn PDF document text
    • http://tscyw.net/userfiles/file/20210705011607_rzgevp.pdfIn PDF document text
    • http://seoulmenu.com/uploads/files/wezenejofavasebezeweluwe.pdfIn PDF document text
    • http://volkshilfe-ktn.at/images/content/files/95869181679.pdfIn PDF document text
    • http://conblocmanado.com/pics/file/jexibunukafijajube.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/234089dd9e983d4b94a7fdeb892fbda6/rirorevexet.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/7c8ec248e2e5280cce2d486b56f64f1d/zetovadexatu.pdfIn PDF document text
    • https://biocoils.com/img/file/72088773355.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/4af1e8553bac458fb1f8164e9213253f/64595634750.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/fc39a671fe0a3ff2739d7a8ebca9ca0a/wajozamaputilazup.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c0c70724a1e---zedifedatopedamosaki.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/56ab1277e7895a2847215f6180f597d5/zetizozotemenetefep.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce6a566db3---17204890254.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160f2132066948---nesimutelotakewex.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/5jms0euf79b0m25m25dddjhna5/44526498169.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160738f55ba24b---73907083011.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_off0000bf75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF75 11076 bytes
SHA-256: 496782c71ae289dc85c8502890040f5d8a1d7f2efd0f838345b464520771712b
font_01_sfnt_off0000d959.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD959 16912 bytes
SHA-256: f887ed31644d11e9148c1138a2ddd085cce75ef9052b372eb7f9ac2d564b7761
font_02_sfnt_off00010506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10506 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1