Malicious PDF — malware analysis report

Static analysis result for SHA-256 2eb88f848b381abc…

MALICIOUS

PDF

88.7 KB Created: 2021-09-11 21:28:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8cc9f24da5dd8d652522fba56a469eb9 SHA-1: 361effd20cb61d7582aab2099bb8b877dde32d02 SHA-256: 2eb88f848b381abc2dd0d11e5abd2b943fa039d362947a81a75c1643260b9b06
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs pointing to various domains, many of which are hosted on compromised WordPress sites or disposable hosting. Heuristics indicate this is a link farm designed to redirect users, likely to phishing pages or malware downloads. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://pixomot.ru/uplcv?utm_term=interior+of+minecraft+house PDF link annotation
    • http://marinda.ru/pics/images/file/17249162360.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/161340577f15da---71476147097.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/82b0df6bf8e0baa7663587fc97f067fc/5650964253.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/842a323610d7e2c5b9b33704058b128f/xavuxob.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/a72dc2876707cf4a2ad09f115a6d955f/wimuxu.pdfIn PDF document text
    • https://erdemlerkoleji.com/resimler/files/terudedozo.pdfIn PDF document text
    • https://euinsuti.uniluxgym.ro/app/webroot/files/userfiles/files/6699182719.pdfIn PDF document text
    • http://thinhhoanggia.vn/Images_upload/files/noropowu.pdfIn PDF document text
    • https://et-auditing.com/userfiles/files/59251216800.pdfIn PDF document text
    • http://vinaktv.com/storage/ckfinder/files/9582756564.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139a32a57f25---jemutazukivaxapogag.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba37879712---sobil.pdfIn PDF document text
    • http://csc021.com/userfiles/file/20210908150747_fx45ue.pdfIn PDF document text
    • https://deycaterers.com/ckfinder/userfiles/files/45394360605.pdfIn PDF document text
    • https://www.aukuras.org/ckfinder/userfiles/files/96942528608.pdfIn PDF document text
    • http://nj-rshb.com/v15/Upload/file/202198555109757.pdfIn PDF document text
    • http://agrobud.net/uploaded/file/96058033249.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1613685c405d24---22899607188.pdfIn PDF document text
    • https://hongmao.tw/uploads/files/202109040914554599.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/cjjumbd6r35t42ts5bs0gvgcvn/73767693137.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/11630234526.pdfIn PDF document text
    • https://nhaccugiare24h.com/uploads/userfiles/file/wewesexiwajativilurap.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/2635066448.pdfIn PDF document text
    • http://cherryontop.pl/upload/fotki/file/dikodomeboverujijiberal.pdfIn PDF document text
    • http://childconnect.com/swi/fckfiles/file/72327049121.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_off0000f43f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF43F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C56 10608 bytes
SHA-256: 307c646771661062ac363acad7feed7b6abf6d50c80ac1a4055d357adacf9957
font_02_sfnt_off00012466.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12466 18748 bytes
SHA-256: c85f9aebfa9d17586d03ed0405c3568c3e99b8396ff44e79b033c0332f21541b