Malicious PDF — malware analysis report

Static analysis result for SHA-256 90ced255e7d6591c…

MALICIOUS

PDF

71.1 KB Created: 2021-09-28 09:50:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 24999b8fa9b0bd8384ff0abfce818886 SHA-1: 5b4f5fac7583b4f46d537deede6cebbfc62d3a4d SHA-256: 90ced255e7d6591c83d8499435a371fa2ba37de4e9c06fc79002135f4c898b3f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. Multiple heuristics indicate the PDF contains numerous external links, some pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to potentially harmful content. While no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of phishing or malware distribution lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mrpennarak.com/user_file/file/95844677722.pdf In PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161369225147ea---94613395874.pdfIn PDF document text
    • https://sharjahcements.com/images/bulk_images/files/wopomonuwawada.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/161419b949373e---wegedidasegewogaliredo.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/15164052383.pdfIn PDF document text
    • http://pamatudarbai.lt/ckfinder/userfiles/files/30465730465.pdfIn PDF document text
    • https://muguet.fr/sites/default/files/file/wabimasozapujunivamani.pdfIn PDF document text
    • https://bartonsteel.com/tony/barton/ckfinder/userfiles/files/fusuvolaziwadi.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/81407789995.pdfIn PDF document text
    • http://theleadershipworks.com/PO2/UPFILE/userfiles/files/33979571559.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/2542579397.pdfIn PDF document text
    • http://jamesandsons.ca/userfiles/file/kavuna.pdfIn PDF document text
    • https://ijpdua.com/contents/files/17473244655.pdfIn PDF document text
    • http://h-p-n.fr/catalogue_dynamique/file/96420765242.pdfIn PDF document text
    • http://professionalcatererspaul.pageindia.com/resume/cms_files/files/95929132681.pdfIn PDF document text
    • https://buildingexpertsdirectory.com/ckfinder/userfiles/files/73828529877.pdfIn PDF document text
    • https://www.akilciilacdernegi.com/ckfinder/userfiles/files/44347202696.pdfIn PDF document text
    • https://mimpiindahsatu.com/contents/files/nawunedoxipisukar.pdfIn PDF document text
    • http://zenpersonnel.com/UserFiles/file/ditewasamutakalidupas.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/ec82f636ff5cd310d73fc6ffc2c2eb27/kenodava.pdfIn PDF document text
    • http://jinshi66.com/uploadfiles/files/39085929586.pdfIn PDF document text
    • http://jubileejec.com/userfiles/files/86301129167.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=logic+iq+test+questions+with+answers+pdfPDF link annotation
    • 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_off0000b0b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0B2 17324 bytes
SHA-256: a9e509b24fa7af33cc21353bb34555db0a2ce9fdc59696017fa2eaaf8fe59b36
font_01_sfnt_off0000dce3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE3 11144 bytes
SHA-256: 645a238d838e66f993339b89d5838ca4bbd08866ddd97ce69968a3eb6a00b690
font_02_sfnt_off0000f66b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF66B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1