Malicious PDF — malware analysis report

Static analysis result for SHA-256 6506f72ec303acef…

MALICIOUS

PDF

82.1 KB Created: 2021-08-06 14:07:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 96063a8031ba9bb23c6571125f67edbc SHA-1: 4d14eb653c8b3ce25a39083e9ed1018c6ed1176a SHA-256: 6506f72ec303acef10cd4e6cf4edcd62607868836cf07fa862cdd9a8b44e8080
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to compromised CMS upload directories, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the presence of multiple compromised URLs is a high-priority indicator.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://drafthe.ru/uplcv?utm_term=exercises+on+adjectives+for+class+5+with+answers
    • https://ddshower.com/ckfinder/userfiles/files/tolufudexaxuluzuwuluzase.pdf
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080791336061---38843039537.pdf
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/hdj6vd831l7f9l0lfokk29ejce/wotosaritofozebux.pdf
    • http://ptairsupply.com/userfiles/file/sezijusarazup.pdf
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/ac8tq78oj9ejh8ua08fglj7q9q/59678774061.pdf
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081f4092a7aa---dipaxafazenenubamow.pdf
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d68a4b03c---fuxumav.pdf
    • http://chatfieldfarms101.com/userimages/12673024352.pdf
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/3197a627468fb2f1ae3e8414ad20b63d/dosetatexefiwiken.pdf
    • https://paidionresearch.com/userfiles/files/74852624195.pdf
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/9toc7h0btf1debl8phnme9itlr/nowerosuxo.pdf
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/d21f4d45119743c709999609a8f746b9/26639528191.pdf
    • https://acronimocostanzo.com/userfiles/file/6088394361.pdf
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/353f9b644e7144f0432e71af8bb104c5/91320263423.pdf
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1608e7b2b2118e---66647704847.pdf
    • http://www.dogwoodagility.nl/ckfinder/userfiles/files/68888907879.pdf
    • http://mdbim.pl/ubezpiecz/obrazy/file/93284977545.pdf
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16073904e41016---pejidafuxukekedozopir.pdf
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16072fb787cb6c---denifavosabaradigaxagi.pdf
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c10d3122635---sidafodevolupekegoxi.pdf
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b490e3aedf---55777836523.pdf
    • http://phutungototuanphat.com/img-tvdl/files/90896707079.pdf
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/b2400d23f9e87c2acabd37191ec8f3b6/96327299754.pdf
    • https://tiklatakip.com/calisma2/files/uploads/99461679616.pdf
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/7e9d0964205b62adf3d1a9d8101b40cd/34324934424.pdf
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4614b875ec---webawabemakifodaguguvonu.pdf
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/d366a50e987e4d834febf48559d8d9bc/gobifor.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_off0000dbdd.bin
36d47de83fbd2c1ff54a60480e8f8d18081bd22061cbd7470b9dcb950f142d7b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDBDD 16596 bytes
font_01_sfnt_off0001069a.bin
8d18aad0c1807f1744613e77ae162f85625fbccc55c6c6a33317e8f34b586574		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1069A 11072 bytes
font_02_sfnt_off0001206f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1206F 16792 bytes

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