Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0c431d60713f2ef…

MALICIOUS

PDF

89.1 KB Created: 2021-07-02 09:42:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4088dfe6b79273281ab68b50b98a6dbd SHA-1: 86b42ee1e917243474d98ddcd8316716872a7fbd SHA-256: b0c431d60713f2efcec26951d9020e1ba683b66d4d4a84b80a218b11eaa350b9
96 Risk Score

Malware Insights

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

The PDF was flagged by an ML classifier as malicious. Static analysis revealed it functions as a link farm, containing numerous URLs pointing to distinct hosts, many of which appear to be compromised CMS uploads. This pattern suggests an attempt to distribute malicious content or phish users by leveraging a large number of seemingly unrelated domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 5

  • 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 http://www.amedna.com/userfiles/files/41683567547.pdf
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/9f0b3afb79rj2e6bo70u56e8u0/41370337646.pdf
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b0ffcc401c---98488868216.pdf
    • http://sanarina.de/ckfinder/userfiles/files/70634049856.pdf
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca1ae96d888---masumenuzab.pdf
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/sr4kbfdl2ulpk8kukgad15o58i/49579664296.pdf
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/613124e95b5ca81b1855d2a224c5a6ab/3946874165.pdf
    • http://ajivikafinance.com/userfiles/file/zufezumarararo.pdf
    • http://www.reenactmentmarket.eu/images/wyswig_images/file/19522502755.pdf
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/mohbhvgccvcdskcfsftgujrn6d/wosas.pdf
    • http://stalmost.pl/userfiles/file/xetuxagavuvuwimimo.pdf
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/70klqg7e3dfu8egse6mjr888og/nijipulonitopatonal.pdf
    • http://gandolfiarchitetti.com/userfiles/files/73669994407.pdf
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1609046de39cb1---kobusuverinus.pdf
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/75214ab8d5d6339ca7aff1189029bb0f/76330801320.pdf
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16076f9bd8e457---92138703221.pdf
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/bae1b4116c1727eb98d70a309db3a39e/nexusifonukifizur.pdf
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/8pla0thcgkl27tqqhlofh42jd9/vujobibaponu.pdf
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce21d058e6---sevosufudorifukoku.pdf
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070e0f31388f---5936909638.pdf
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1607e40a146159---ruguwakoxujemon.pdf
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d91813844b6---67258540126.pdf
    • https://mattress-leader.com/media/13304278157.pdf
    • http://bettekingproductions.com/clients/874300/File/67676898254.pdf
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608431b87d3dd---19240215475.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=i+want+to+shout+it+from+the+rooftops
    • 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_off0000fb28.bin
c06852476768965dbef87dd6c7242bef4e5dc934e9d21dcc379d41ddf51b87ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB28 10712 bytes
font_01_sfnt_off000113a0.bin
b8e7659a0c26c2cdd25bc63454882c13033b51dec558b93ad8bc007b6160761d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x113A0 16860 bytes
font_02_sfnt_off00013f1d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13F1D 16792 bytes

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