Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e5a6ceffc34a0f3…

MALICIOUS

PDF

73.6 KB Created: 2021-06-21 04:25:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9a6f6c2d14cafd35978438bd62071098 SHA-1: 9d43a36cb68384ed521cc642d0eb645e9f07d588 SHA-256: 7e5a6ceffc34a0f3b3598dcd17e4cde3ecb775e10dad8be5cfbd173676aa2460
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the overall structure and URL patterns are indicative of a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://laborke.ru/uplcv?utm_term=thuppakki+tamil+full+movie+watch+online
    • https://aihr-iadh.org/uploads/FCK_files/file/tufurafekeleji.pdf
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1608926f29421b---25086095496.pdf
    • https://stijsr.com/userfiles/file/xirefelas.pdf
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/if79lcd611rf3bbfitmsfkpki7/fasefizur.pdf
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/c9def823953fb6dd0525eed76e6897b1/91873927386.pdf
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/a3098103c7fbe865b4a360b43f25e3b9/nepavuzikixodaso.pdf
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076145902b36---penexesovoza.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a3ca99df36f---puluxa.pdf
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16090eeff7e324---gitaxepogunedobajovube.pdf
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/f51165c263ddb66ab30a9527d13c998d/juletujisikajidobed.pdf
    • http://voxel-avocats.fr/uploads/file/34489280317.pdf
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160a3cc860a711---wurif.pdf
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b5264e0c85a---66068140523.pdf
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/8h549p46be5skncdu5m47urcj3/wafexuv.pdf
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/e5aff3ae0b61fc9984e23623c5bb3ace/89993968972.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e217.bin
66c7b87dce6a006a58a2d3f721719db57aeb9050a15cbd8b644559643b8c76ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE217 5148 bytes
font_01_sfnt_off0000f390.bin
76e6b998c751fde720492bf56fb8e0bad1673fced7b024ace6421916cfa6a395		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF390 11012 bytes

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