Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e23255ca6662823…

MALICIOUS

PDF

74.0 KB Created: 2021-09-04 01:23:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 73a1bc87bdda40a5b0d9208723c26cea SHA-1: 1bd1d37284c166fd6f9615677c1b6f54315db247 SHA-256: 6e23255ca666282303069fa874009b809c5b061789664dab2395d75fadaad79d
156 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to compromised WordPress sites, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic firings and URL analysis confirm the link farm behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/1f637fcd97a7c7b78a88e334fff928b5/34059704054.pdf In PDF document text
    • http://unsersohn.com/images/file/puzotan.pdfIn PDF document text
    • http://bmsorganica.com/userfiles/file/pexiwipatakavuxizudikad.pdfIn PDF document text
    • http://gryfarmerskie.pl/pliki_wyswig/files/79834513582.pdfIn PDF document text
    • https://apsco.ly/userfiles/files/furolonofinofagoganu.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/87fff5f53b7793b84c7f2dd4f2f8b94f/97226580830.pdfIn PDF document text
    • https://hsse.cl/files/70540448990.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/4pta5gns395727eulij2r7ob2q/87853710388.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/29d3a478878adf82bd8bdfe1bc61f5bb/wamigelumubefiburenal.pdfIn PDF document text
    • https://rajatotogroup3.com/contents//files/melasezuvenuravuwudo.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/v1sndi4hamterclpn0q55m8fd7/dovupirekafojovifo.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608404ad4e907---tiwajulimisipalik.pdfIn PDF document text
    • https://pearproperties.in/userfiles/file/taviloligekem.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/nexetiwuduvefogup.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160871b4cb0663---13410482573.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fbd58d759ac---78597957838.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/5lqfk9q4pc1tfkr45ojng48ums/zilidoli.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/79668882085.pdfIn PDF document text
    • https://strechybenesov.cz/content/fazanutuvabumakudero.pdfIn PDF document text
    • http://daugiavanthienphuoc.com/media/ftp/file/81466826755.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/xigubejoronusewosa.pdfIn PDF document text
    • http://larben.cz/media/images/upload/file/pifadato.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=musculoskeletal+mri+helms+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_off0000bc1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC1B 16876 bytes
SHA-256: f5a79bbddeb0343b0b5aa6f33dc912f1c8f780413c8c7e8eabca34a66ff4232b
font_01_sfnt_off0000e6e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fefc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEFC 10964 bytes
SHA-256: d30a232da156215662310dfd9f60852bd0e5b08b0e35d4dfa4a18930087f992c

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