Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f9a8a7f5730cd0a…

MALICIOUS

PDF

74.1 KB Created: 2021-06-29 02:54:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 367ec9dc0504c653536cb21a00f3190a SHA-1: ed6a7e3a795a1af91f7397f0f94106b54da034ee SHA-256: 7f9a8a7f5730cd0af4896ad250dc9881773bd96a25814f71a34a3f7ce5dce40c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains numerous links to compromised WordPress sites and other disposable hosting, suggesting it is part of a link farm designed to distribute malware. The presence of a 'download button' heuristic further supports the interpretation that the document is intended to trick users into downloading a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://philabc.ru/uplcv?utm_term=the+methods+and+materials+of+demography PDF link annotation
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/8ss5u7o3vaf2icbmu22dg0sgf1/kenikizowefo.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608db631efe53---xakuke.pdfIn PDF document text
    • http://dambi.pl/userfiles/file/gusiraletewibufelo.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609f8fb9c94b0---99042184805.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/0018a1e09bd8f26784993e41ea26d922/29984300536.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c44b30a7c7---5626477104.pdfIn PDF document text
    • https://fajanav.com/aym_image/files/13445761821.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609e14189f7db---xagetatogupotuvakulodake.pdfIn PDF document text
    • http://heninrealty.com/userfiles/files/13728720135.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/menedevemebupobitem.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/cc5383009e6dc444f150841d04114954/wizafitupamuso.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce4912f086---79127528610.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/guwejidizomosejubum.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/c2276e4cf67209b1827a46382003ef71/95487217265.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/15071408976.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1621399544.pdfIn PDF document text
    • https://carrieres-pierre.com/userfiles/file/suzizoforabu.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/99431559875.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/q9017ohhiaicmccf8ebqs4eeh4/migeboxafipoturuxuso.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/30b2b8b1dcf04a038f9838d9cb54ac89/dedur.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a6e69fb66b6---fazorewezirosamubibu.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c28ce19be12---xobuvuwisebodif.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_off0000be53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE53 11020 bytes
SHA-256: 3084442c99f5a8ed7cab006b2766f3b6531fe7fa6efbb0a44a7fb686be64c89d
font_01_sfnt_off0000d796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD796 16528 bytes
SHA-256: ce3d8c63303c6bbc8ad9d37f09af8a528b11e3aefa7cd4e072fb928253781543
font_02_sfnt_off00010312.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10312 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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