Malicious PDF — malware analysis report

Static analysis result for SHA-256 c05570452ae4f57a…

MALICIOUS

PDF

87.4 KB Created: 2021-07-02 05:15:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bf5db9d35975ca93a8e848fe63ffe1eb SHA-1: 001d75a096ef1eda14e0feea1c595483ba49bee7 SHA-256: c05570452ae4f57a040fda7d782e131fb50ed0b999fdf18e5abb0b81811e5b0a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many pointing to WordPress sites with form upload plugins, suggesting a link farm or phishing lure. The presence of embedded URLs and the PDF structure itself, combined with the heuristic firings related to compromised CMS uploads and link farms, strongly indicate this PDF is used to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://medvor.ru/uplcv?utm_term=pee+has+strong+smell
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/3ba88c54bdf6a0ecf6fcdabdec46a239/90962146069.pdf
    • https://securitydm.rs/slicice/file/xibadimexonaraw.pdf
    • http://home-delighted.com/user_img/files/fadupipowiloxod.pdf
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d60352e3f7---24946733183.pdf
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7c3ddc220---24865487528.pdf
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/00mqa846odm12ce5vkfqprkid3/jiduxexonakux.pdf
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/68965678456.pdf
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/n959m9vjc6qoog9bea61uhn8f5/vujepaluvetojozapojagizis.pdf
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16077eb96c7f72---wokulurapolikenudot.pdf
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd6fbea301---10380385778.pdf
    • https://cafesca.org/ckfinder/userfiles/files/kogagokubironameselud.pdf
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a0bbb2d6fbc---75373223482.pdf
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b699b59b60---35696160862.pdf
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/hn9vsppu6qcseljhfhms4es0a5/55930560749.pdf
    • https://aviatroglo.fr/IMG/file/71377471433.pdf
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3c3c5abae---sakupaweditukinixekewegu.pdf
    • https://gloriouz.in/ckfinder/userfiles/files/gojozugobamotipez.pdf
    • http://aaaexpressheating.com/userfiles/file/86063327392.pdf
    • https://ficsllc.com/wp-content/plugins/super-forms/uploads/php/files/5vaq3vvbbmv263ipna7nessrce/karofipajarusukixulok.pdf
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/d9851bb7c3c6e78b55fc9a60ce197a87/65980155354.pdf
    • http://kaies.cn/upfiles/file/21573271002.pdf
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085b8e4297c6---rupanorugarumipebow.pdf
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d37919a0a1---33301499639.pdf
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075cb26e2313---80795243058.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_off0000f5ed.bin
74fa0bf3c31e3a28b472fbcb265cf9259259f21c2cbff8bd068863aeeb0aa13a
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5ED 10464 bytes
font_01_sfnt_off00010d8e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D8E 16792 bytes
font_02_sfnt_off000125a0.bin
fa06fa3a6b9a76bf48fee99305e3091f77dd55b9a95339ca165d5880c956ae47
pdf-font-stream PDF embedded font (sfnt) at offset 0x125A0 16692 bytes