Malicious PDF — malware analysis report

Static analysis result for SHA-256 c51be9772c8a182b…

MALICIOUS

PDF

89.8 KB Created: 2021-06-28 01:15:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 193c907200886b1d2fa1015ca3446180 SHA-1: 359cf7969cb8cbf8c4a24d72065b3369cd785446 SHA-256: c51be9772c8a182ba2301c84bd0129b9c0e232536b65fc4d7306b59d5af24c15
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, embedding numerous URLs that point to compromised CMS upload directories, suggesting an attempt to distribute further malicious content or phish users. The presence of multiple compromised hosts and disposable hosting patterns reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://dush-kz.ru/uploads/fck/file/65131406158.pdf
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/6968d013bb17eb0072083033492e07a3/33380411089.pdf
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160866955d2f00---fabivodapogojipa.pdf
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc79805225---79502991881.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16087eb629a5bd---54916048279.pdf
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d8f1485e14a---16701609303.pdf
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/21bf47b86cd514e4dd6657f3ae706e9c/xitemijuwijozuvosozoniv.pdf
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/69e1e0f6397ac44fc3ef8d85615791d8/nukizugafitebenunud.pdf
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087ee0150b33---vitaxuw.pdf
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b6abdc36e52---risepefazovuza.pdf
    • http://urbancollab.com/userfiles/Proj_Name//files/nuwuterugukemarebojo.pdf
    • http://alexdisinfestazioni.com/userfiles/files/gapotonedovelikudanazivax.pdf
    • https://euforbiabulgaria.com/uploads/pages/files/pebepazotakaze.pdf
    • https://isosklo.cz/uploads/24690647331.pdf
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d09d67a16---96718500226.pdf
    • https://baongochoa.com/upload/file/lulufikorituzodat.pdf
    • http://cnzhongkui.com/fckeditor/editor/filemanager/connectors/php/uploads/file/312227083757.pdf
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afdb40eb555---ralosupenifewulasamo.pdf
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/85dbcddff92680649b9c6f6adf268abf/rolemubitigujuruk.pdf
    • http://anhbanglaw.com/userfiles/file/siludodubevojifopifelate.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160ada107886a4---tikuwobafoxo.pdf
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd36175771---35942876091.pdf
    • https://gamaconsultores.cl/upload/file/29302686894.pdf
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/fab1b59d058e7bd2883984bb1330eebf/widabemenagofewarowafa.pdf
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/5410562e0293b963d98a46ba78f543bd/21467383745.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=the+glass+doctor
    • 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_off0000f95c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF95C 16792 bytes
font_01_sfnt_off0001116e.bin
3569e36ce6c3dec4c60f149514ce20d0009b3fb84652defc8a82477005ecbd02		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1116E 18728 bytes
font_02_sfnt_off00014299.bin
83d96fc3c10b7fd59e8ccee520a7e3d604b9ead6db2b49d75bb4fd38bcad530e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14299 10416 bytes

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