Malicious PDF — malware analysis report

Static analysis result for SHA-256 82ed027f81f9a519…

MALICIOUS

PDF

94.2 KB Created: 2021-06-26 22:15:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ec16c935ff388b3f52d7baea5084cfe3 SHA-1: 7173887a3853790dfd20e6d074707236e1ecb842 SHA-256: 82ed027f81f9a5195b7ffb1482f16ff090a03e4b47cd20f378b6747e470b124d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains numerous external URIs and is structured as a link farm, with many links pointing to compromised WordPress upload storage. The primary attack pattern involves luring users to potentially malicious websites via these embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://crysiq.ru/uplcv?utm_term=korean+words+to+read+for+beginners
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9f3ad859e---25169244168.pdf
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/ll42hi2he5e7sbof9tdrr7kejk/gefuzebapofumevurapuwo.pdf
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f6e3aea06a---47798825032.pdf
    • https://ancoraeducacion.com/images/34099096283.pdf
    • http://harasim.cz/uploaded/files/faxalamanojoxid.pdf
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/e0ebf5091120cc97cc00ca2d17894db9/92547817079.pdf
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/8254dacdf0165b66dddac2059e66e557/99220383435.pdf
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a619ef6e9a9---69324388703.pdf
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f740fd3074---pukojijuloxusadorawenobav.pdf
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160828b4da43ee---wefusafavatupab.pdf
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/e472614c534a964b525b35ea7cf88eaf/desikebimemezopegikaw.pdf
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/18d7cc0a4601194e45289bd5f690be8a/69613953753.pdf
    • http://baraanduliaptti.org/userfiles/file/kunapakevuzab.pdf
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608d132745999---64552610773.pdf
    • http://nitexprofi.cz/userfiles/file/84007011634.pdf
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a3c50600ba0---rujezapopedupijobakezadu.pdf
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607be3a054eb2---dipab.pdf
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/i1vu7q3flnstfab78l4p8uv63s/zoguso.pdf
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/80eb3hoc53ivbi9r1ubpq3votg/33332575973.pdf
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/q3ddf4mptuoenfsucr58ieifc7/38929840737.pdf
    • http://jingluo.net/uploadfiles/files/widutejelemudal.pdf
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/397tnh1m67m2th2nef13hfs4vl/fudevikovuregefuse.pdf
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/fe9fc47ad2100e6831c6787c204df557/44752060173.pdf
    • http://dokumsuzgec.com/userfiles/files/jiserojalupijediwukabu.pdf
    • 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_off00010af9.bin
520174456adf9f850da29b682bdecf3c174d3145a51861362b1af556bd24c2cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF9 10700 bytes
font_01_sfnt_off00012388.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12388 16792 bytes
font_02_sfnt_off00013b9a.bin
7c823fd12b91d3981bde02b65d7aa02cfeb28174c59aa93b55d4f2d2ed6be52c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13B9A 17532 bytes

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