Malicious PDF — malware analysis report

Static analysis result for SHA-256 1007f18f5bff0785…

MALICIOUS

PDF

160.3 KB Created: 2021-07-21 10:46:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 86f54c9fe668716015b5237946e88786 SHA-1: 52e25660176827ab2480b9071f7246fad66c560c SHA-256: 1007f18f5bff078543048e32b4d366cb7dfc3802ccd9799133cff32ec0206a2d
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites, likely serving as a distribution point for phishing content or further malware. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ebeb107189---zisexosovod.pdf
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/f816e43107f02614823e2fa11d72cbf6/12865476325.pdf
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e622cc0c797---lenorumigu.pdf
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160729e70a4c5b---27059883278.pdf
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/62b922aabc252be4bb21aa73afbf2aac/67428203819.pdf
    • http://mitcostruttori.it/userfiles/files/99293080935.pdf
    • http://princeworldwide.com/multimedia/userfiles/file/1929039097.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e380cc8b6---getekarekopeli.pdf
    • https://vansuloi.com/uploads/userfiles/file/32034056485.pdf
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce7004f0df---27278570204.pdf
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/66f0bc2f9e38edcbf552f83ed4b0ca75/81284154837.pdf
    • http://forglass.sk/userfiles/file/76108925242.pdf
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bab23e30fb4---86067394687.pdf
    • http://chalappuram.com/userfiles/file/nokanutesipuxabitava.pdf
    • https://muzeumkonstancina.pl/attachments/file/18581426514.pdf
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160dc36be5d750---6376915912.pdf
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160749fb92b374---62591071142.pdf
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607df60dcd318---91469562835.pdf
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/57e619ecc7dbceddfe6b87e033d66a62/36858177805.pdf
    • http://studiofantino.it/userfiles/files/8925862423.pdf
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f5bd479f222---jufutamemaraweparizixe.pdf
    • http://brianhaymore.com/images/e/file/55369364394.pdf
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160776b4ddff81---kupuladujire.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=book+of+mormon+3rd+nephi
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000214ec.bin
16ce8bc24081639cecc96ec81de7b086e7f972952aa67bfa7c2e957b0461ce02
pdf-font-stream PDF embedded font (sfnt) at offset 0x214EC 18168 bytes
font_01_sfnt_off00024393.bin
7dce734ae4d101904ea091f6412d1297ec8f7c001e16e02b12caccc77738063a
pdf-font-stream PDF embedded font (sfnt) at offset 0x24393 10604 bytes
font_02_sfnt_off00025b94.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x25B94 16792 bytes