Malicious PDF — malware analysis report

Static analysis result for SHA-256 79b4e3a73b831b9a…

MALICIOUS

PDF

73.8 KB Created: 2021-09-15 09:44:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7072add8f496251eea527cece040823e SHA-1: fdf5a674b22076731a565ba745537066052838f0 SHA-256: 79b4e3a73b831b9a3bc7e5990504d5f8203c7b8f58974744f17d55766aa7def1
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs that point to various websites, including those hosted on compromised CMS platforms. The presence of these links suggests an attempt to lure users to malicious sites for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://archism.ru/uplcv?utm_term=index+of+modern+family+season+9 PDF link annotation
    • https://graveyards-fuj.ae/userfiles/files/legiwududi.pdfIn PDF document text
    • http://jubileejec.com/userfiles/files/86301129167.pdfIn PDF document text
    • http://space-edge.com/upload/files/beborurejisani.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614164353b9b4---ziwobabul.pdfIn PDF document text
    • http://dtyxbpzx.com/filespath/files/20210911202339.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/d7bf3f648b29aa3243f35535a5123114/77417825197.pdfIn PDF document text
    • http://zatacorp.com/upload/files/banozuxunixuwigo.pdfIn PDF document text
    • http://suliaox.com/v15/Upload/file/2021911224574506.pdfIn PDF document text
    • http://proclima-membranes.ru/userfiles/file/14431059700.pdfIn PDF document text
    • http://www.optimizecost.com/admin/ficheros_fckedit_subidos/lamakobo.pdfIn PDF document text
    • http://korvet-sp.ru/userfiles/file/23509732483.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/c5e5bf05bae4f428d1a73c9d97a9419e/vasal.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fcb895414c---44241056110.pdfIn PDF document text
    • http://kancelaria-perfect.pl/app/webroot/media/files/62338840678.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/13fadc53afaba33a14382234e870c478/wiwidekovibipebuxudeb.pdfIn PDF document text
    • https://philly.drinkpoint.com/uploads/files/funir.pdfIn PDF document text
    • http://cleanking.net/userData/board/file/xukezafizipugizoderor.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/63514322109.pdfIn PDF document text
    • http://urbancollab.com/userfiles/Proj_Name/files/36582220616.pdfIn PDF document text
    • http://evpltravel.com/xv_image/file/pufikaxeja.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/dowukepovukasebofivegipe.pdfIn PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/devomuxuluwoxo.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_off0000bd46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD46 10752 bytes
SHA-256: d8b911aa20bfb8fa78e2f8e8a5895352c83af52d8e0dcd85ff21b24f689ecd57
font_01_sfnt_off0000d5fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5FD 17000 bytes
SHA-256: 2096cf60b3d436b423a5677f7a44e18e839c04013b443f20c15dea89df73b417
font_02_sfnt_off000101df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1