Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa5b8e8edb34e2f8…

MALICIOUS

PDF

85.7 KB Created: 2021-06-27 07:18:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0d0d977bc37a6320deaa116ab54eabd5 SHA-1: 899778e00a2ad3f5842277f35d2c5b441f210c08 SHA-256: aa5b8e8edb34e2f884b319da503ada69ec250b9bed9df37263e4488b57578725
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the PDF structure strongly suggest it's part of a phishing campaign, likely using spearphishing attachments as the initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://coretry.ru/uplcv?utm_term=data+science+for+supply+chain+forecast+pdf
    • http://photo-preiss.com/upload_files/files/86991428622.pdf
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/21mcg347ede24fl69gd7180bo7/23004131985.pdf
    • http://smartarts.bg/userfiles/file/jatuwesesijedovedejuzupuv.pdf
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160781a953eb14---35396773420.pdf
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160c0e46019658---45249901682.pdf
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609ccb8765497---sakawili.pdf
    • http://polish-house.com/uploades/fckeditorfile/dadafuvinisar.pdf
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc4b888c1d---gigufodul.pdf
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160988d234a41e---7491737968.pdf
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9fd36d859---93944894635.pdf
    • http://ingmontagna.com/userfiles/files/92694889509.pdf
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/2c0888f6a67b5b115940cadea4dc5e3c/2286175992.pdf
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb83ad2966---63520976427.pdf
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2fac376898---74057366124.pdf
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091ea3dc4714---64716104771.pdf
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607077d5d45af---12521588478.pdf
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/6rlnmrten1d7lprln4ap1797u5/51639594114.pdf
    • https://ozmutludokum.com/userfiles/file/81924028393.pdf
    • http://flambotour.it/themes/userfiles//files/silim.pdf
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16084d2453e61b---93279459205.pdf
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087b7e07f248---75191696723.pdf
    • https://dondepodemosir.com/userfiles/file/15523933607.pdf
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/kefatov.pdf
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4604f238f0---25310744679.pdf
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/l4nu0kpgamorkdfh1og2qo475c/85494711665.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_off0000e935.bin
7ec52c974b1f8e2c0b5a67c9174fa85446728f2c312c0acc90ad71488f435902		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE935 10932 bytes
font_01_sfnt_off0001028a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1028A 16792 bytes
font_02_sfnt_off00011a9c.bin
3e281d2d0d4264bac91eee67e7e8b929c26f48d6ff46ccbb0125bffeda39b3db		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A9C 17656 bytes

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