Malicious PDF — malware analysis report

Static analysis result for SHA-256 8209b4f23c903bd3…

MALICIOUS

PDF

88.1 KB Created: 2021-06-25 19:43:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 144f1e723a9f5f24c5ab07adf2f3fec8 SHA-1: cfc049f913b5acf5a54b067fb3615e744696a769 SHA-256: 8209b4f23c903bd3749706983aed8ccb5c1dc9eb7d8d18ac6d2723ab7c169db8
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites hosted on compromised CMS platforms and disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://kgmda.com/upload/files/83290046278.pdf
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/f913b3754553810b6e289c7704661e45/sonuvo.pdf
    • https://gastrotest.co/ckfinder/userfiles/files/remubimomini.pdf
    • http://aivieksteslaivas.lv/userfiles/file/dekipuminoruganuxifimogeg.pdf
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ba88d96b0f3---lilexot.pdf
    • http://elitvorota.ru/f/file/75607444310.pdf
    • http://ippon.lv/uploads/File/16153628673.pdf
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/f09ea4150aa834f60efafdc2ccb2b7cc/vedaminujelifewel.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160982e3902728---vokexotide.pdf
    • https://accuratesearch.com/userfiles/file/gemamosadidepox.pdf
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/09rhe9c0f98bqhbhb4063iadoa/gidusubipedabolebumeko.pdf
    • http://nutrisoilvietnam.com/upload/files/72909055953.pdf
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082cb467bae3---zizulosu.pdf
    • https://akita-inu.lv/www/files/files/ditogisuwaxowowe.pdf
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/b7c155113e6fd2a2d844cdfc3ede3749/mujebad.pdf
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/16077100c21d13---18955269929.pdf
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b1768689627---kogepabonigomurukogagano.pdf
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/ej35kvrk5bpdcd8vqhnule97vt/xivalekukapo.pdf
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/b16c55d6076284882fbb781838ec94d9/67149896723.pdf
    • https://roeveragri.ac.in/wp-content/plugins/super-forms/uploads/php/files/e59beedb90581fb17131e3aa2b4c8789/78438657089.pdf
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608095d81aea5---wajofomiravegagix.pdf
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/375ddbd2ee3f2a64d7ce8d81b69ca8ec/92052341018.pdf
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/51198f59237627a653075d5c24cb4b14/meruxumokugasudapewenu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=4+times+table+up+to+1000
    • 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_off0000f679.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF679 16792 bytes
font_01_sfnt_off00010e8b.bin
4c148f8a7896aef9ecf6ec51e643b9b18f1754dc7e7e6b69688b18067e99cebb
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E8B 17304 bytes
font_02_sfnt_off00013b55.bin
7f46213a3041649800dc6c8d22e702d4d5781a09116a64cc2e103f7563ea5094
pdf-font-stream PDF embedded font (sfnt) at offset 0x13B55 10604 bytes