Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5c751aa678852e8…

MALICIOUS

PDF

68.1 KB Created: 2021-09-30 19:19:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 34d7e7ac041b2e884f5908ef4ea92511 SHA-1: 7119afb81fb778cafcdafc3cd6304909ada52bc6 SHA-256: d5c751aa678852e8a2a03cbb2ece7ed7b3898ebe74ec2570a8f9d5a4890eb313
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed for phishing or malware distribution. The 'PDF_IMAGE_LURE' heuristic suggests it's an image-based document with an action trigger, a common tactic for hiding malicious links. ClamAV detection and ML classification confirm its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://synerhu.ru/uplcv?utm_term=covet+fashion+mod+apk+android+1 PDF link annotation
    • http://cobe-ing.it/userfiles/files/dezogewepomozajebol.pdfIn PDF document text
    • http://spain-ex.com/images/blog/file/67985290719.pdfIn PDF document text
    • http://lsmtrontractor.com/upfiles/file/20210902063237.pdfIn PDF document text
    • http://www.videobezopasnost.ru/ckfinder/userfiles/files/mexekapexikekegoxega.pdfIn PDF document text
    • http://prasongp.com/file_media/file_image/file/tixurap.pdfIn PDF document text
    • http://preiss.at/upload_files/files/92565925297.pdfIn PDF document text
    • https://laserbeautymachine.net/d/files/31021473260.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613971c169541---falukexemomipumosili.pdfIn PDF document text
    • http://biosurfest.com/userfiles/files/tukatibodikazexe.pdfIn PDF document text
    • https://812423.qqtogeljackpot2.com/contents/files/bogusekaw.pdfIn PDF document text
    • https://www.padanguparduotuve.lt/ckfinder/userfiles/files/88567809884.pdfIn PDF document text
    • https://manage4.realtourvision.com/rtv/ckfinder/userfiles/images/files/supitutuxawa.pdfIn PDF document text
    • http://gamax-motor.cz/data/dokumenty/gudumiziwolekagamez.pdfIn PDF document text
    • https://megalightgroup.lv/uploads/files/49169037951.pdfIn PDF document text
    • https://123natura.com/stockages/files/76282021976.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb990614a5---34837673846.pdfIn PDF document text
    • http://fourfoods.com/images/files/rusipupatalale.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c97315f398---wupubedaruluvi.pdfIn PDF document text
    • http://www.lukoilmarine.com/ckfinder/userfiles/files/limagumosovupo.pdfIn PDF document text
    • http://partnercable.hu/files/wozuvat.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/de1e93db463a4628695632a4551da23b/34000492481.pdfIn PDF document text
    • http://ambcavallon.eu/userfiles/files/99807423394.pdfIn PDF document text
    • http://decaiyun.com/upload/file/210915225933788639kvolpnbsccm2.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_off0000ad89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c5a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5A0 10956 bytes
SHA-256: 87c11e8e2f7bc398c3725d416815af355b879937c6d0d69449026412b6d84eb5
font_02_sfnt_off0000def2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF2 14048 bytes
SHA-256: b243f2a3183a9894326de0a3180998b79c44e63f6b2a08e9ed2f58534071d75c

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