Malicious PDF — malware analysis report

Static analysis result for SHA-256 793528a61bd2fa5d…

MALICIOUS

PDF

85.1 KB Created: 2021-09-16 11:54:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: cdd9bc729a6592440e018456e3816670 SHA-1: d5783e825b3831d9ab89a4fbd3635c866f25e4d7 SHA-256: 793528a61bd2fa5d6974fb185f640fba897353e604ae4d380e0d918b42d37ec4
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm. Multiple URLs point to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL analysis strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://shinaltd.ru/images/file/85783559670.pdf In PDF document text
    • http://dsacare.com/admin/uploads/file/47868127166.pdfIn PDF document text
    • https://argekaucuk.com/nbg/upload/files/449621419.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/41853940976.pdfIn PDF document text
    • http://pereplanirovkaoblast.ru/pict/file/tofuxodelanixubozasunada.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/aa5095feb82667c44113c8f30a84c5d9/57507972975.pdfIn PDF document text
    • https://www.creativetalentnetwork.com/ckfinder/userfiles/files/dezegivusepum.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/vamulamulemujipifod.pdfIn PDF document text
    • https://nguyenthelong.net/userfiles/files/24449846973.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/uedsm52r73nlvjg76s5d70blnq/vupevekevo.pdfIn PDF document text
    • http://el-system.jp/uploads/2012/files/63938340435.pdfIn PDF document text
    • http://findusafranchise.com/files/files/rinununavoj.pdfIn PDF document text
    • https://aparcaderoshaddaichile.cl/uploads/images/files/xixadefojavam.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137eb9f8628d---83129691178.pdfIn PDF document text
    • https://bosingels.nl/ckfinder/userfiles/files/89686068515.pdfIn PDF document text
    • http://praxis-greve-polley.de/web/editor/files/57825602609.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/e6a083dc2ea694b90c8e66f4fa606c4a/5808829226.pdfIn PDF document text
    • http://kimdaiphatsteel.com/Images_upload/files/bakaz.pdfIn PDF document text
    • http://dnestrovsk.es-pmr.com/constructor/dnestrovsk/ckfinder/userfiles/files/balutero.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/893259eb4b7b2529dae9476b89fbfe93/wugatefivapunipo.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/d042b7b2a9d9e658ed380c1a3564287b/21233683632.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=watch+movies+online+free+1234+moviesPDF 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_off0000e4c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C1 18624 bytes
SHA-256: 1ee909a8f7f4e4fe4aeeae726dce17a007d0e1971deeadc09ab892e1c54a9c49
font_01_sfnt_off0001150a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1150A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D21 11080 bytes
SHA-256: 383839fadc9de51bf417e82a8c01ab091c17c0f86681f72ffcdf3b8c9d0ffee6

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