Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8fd1125844f9865…

MALICIOUS

PDF

115.3 KB Created: 2021-06-27 04:36:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 16aed7a37e35d7b41ad1cb805d84bab9 SHA-1: 09b012b1a2db18f48c1adebaf12ad1e00f6ee2ab SHA-256: f8fd1125844f986547aaff406676869e9c498f2bc60f9f5b7271cd73dae58a26
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or exploit kits. No scripts were extracted, but the structure and URL findings point to a phishing or content-luring attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://speeddating.lt/speeddating/ckfinder/userfiles/files/xusagawogarakadoko.pdf
    • http://tuzvedo.hu/elemek/file/99180823528.pdf
    • http://banquat.com/userfiles/files/kuxekafujanuzi.pdf
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/u5khfnea884kd7hpl70peqs0r0/ritis.pdf
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/h1mn2ud7qnl458sv0gqdafht80/valugedelofed.pdf
    • http://aj-logistics.com/stock/userfiles/file/50651516846.pdf
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/7p7h48hvud1eo3shiik989g0sp/verezofuxujizibumat.pdf
    • http://ytlcases.com/userfiles/file/69834317608.pdf
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608008ed813ec---tapesota.pdf
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/8b46b0c88142a433cb1e75adfab6ba80/29504302871.pdf
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/0h114fpj8hvpildha7hfvq0kf5/55910741115.pdf
    • https://arerp.kr/data/file///werivakolepuxapusik.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fcaad713bf---30104433957.pdf
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a25392f310c---pibilikorakifep.pdf
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/edef92ec8824fb6ab92a84218e15f87d/670591770.pdf
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/folj4jun7kgv9c9k6g84fkjsgv/zukipoxazajo.pdf
    • https://alkirbilaw.com/userfiles/files/xijavobisadi.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/116acfe1c6420251d0ac9cb4d945b943/12891801247.pdf
    • http://moriefrusca.com/userfiles/files/40206678983.pdf
    • http://www.anclupnapoli.it/userfiles/file/xufenilapazabavul.pdf
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/p7qf5eq7kk49fg2b9g620u4seu/punozesebolinadisoru.pdf
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073aac5717db---83992744860.pdf
    • https://hrmconsulting.biz/upload/files/fuxesimepebix.pdf
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c11cb297395---38710618564.pdf
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0756bd059---juwunedu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=all+reactions+of+organic+chemistry+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_off00015cb8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15CB8 16792 bytes
font_01_sfnt_off000174ca.bin
ad5a7a4cf875b925d56f5e7b8387d806bb8bf5051062a75a7311ba9a46811a1a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x174CA 19676 bytes
font_02_sfnt_off0001a5c6.bin
497f6736bd0eb05fb478372da175e98c062a629b516b378959d89e45400b7bc7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A5C6 11164 bytes

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