Malicious PDF — malware analysis report

Static analysis result for SHA-256 7733b73af9787932…

MALICIOUS

PDF

113.9 KB Created: 2021-08-02 11:51:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a7765508c1f9cdb5c08c1c65051ca687 SHA-1: 75c6d80e1983aea487daec9fc2e4b7eb6528017b SHA-256: 7733b73af97879328f3fed10525431a7b8f9b61b8c8ee521d07da56d3a680da8
196 Risk Score

Malware Insights

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

This PDF document was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing or trojan delivery mechanism. The 'SE_FAKE_CAPTCHA' heuristic indicates the document presents a fake CAPTCHA to trick users into executing commands or interacting with the document, likely to download a secondary payload. Numerous URLs pointing to compromised WordPress sites and disposable hosting were extracted, suggesting a link farm designed to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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://catamma.ru/uplcv?utm_term=how+to+glitch+gta+5+casino+wheel PDF link annotation
    • http://klinok-saintp.ru/files/wesefepugaxewakekopawo.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/u30mvlieimd6u4r3plblpkhu5b/tipitowufas.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4fe3a678c7---5833932495.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ec44c207a9a---36639736928.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/genitod.pdfIn PDF document text
    • http://ropesadventure.com/d/files/fageroxi.pdfIn PDF document text
    • https://silga.ca/userfiles/file/tukat.pdfIn PDF document text
    • http://trendybiz.in/usersfiles/file/zozugajibokefiger.pdfIn PDF document text
    • http://hanart21.com/files/userfiles/file/95141264720.pdfIn PDF document text
    • https://pecsikult.hu/files/file/83664798514.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd9de7bbf16---segipilamenaxedizufexenof.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/69007642742.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16077848847958---57905215621.pdfIn PDF document text
    • http://standardamulet.com/files/files/46686394268.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2cf8d4f714---famunotolubi.pdfIn PDF document text
    • http://didocrosby.com/imagenes/file/kozej.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/620321434bcf5202d7144de4106c9995/3873153240.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/51434167276.pdfIn PDF document text
    • https://birutelorasin.com/contents//files/xodemumu.pdfIn PDF document text
    • http://aj-logistics.com/stock/userfiles/file/69649647446.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/pidasazu.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/8623364270320415fb25dd49533a6d46/63992313360.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b33dd4963fe---katin.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab94597f20e---92255005387.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e62c8180128---21600407282.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015850.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15850 10620 bytes
SHA-256: 0ac94b4fc499376a21abe035565e0a0e9b13ad7a4f59f6bca8b34947bb6aea3e
font_01_sfnt_off000170a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x170A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000188ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x188BA 18284 bytes
SHA-256: ab7b2760fb6b7f9e06eb1835ccabcfd0d497233832c1e230d10c92754b3ac7cf

Open this report in the interactive analyzer, or submit your own file for analysis.