Malicious PDF — malware analysis report

Static analysis result for SHA-256 63486ea338a4e537…

MALICIOUS

PDF

76.3 KB Created: 2021-06-28 02:43:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bf7c2e99a2189c8f57453024470082f7 SHA-1: 136133750208b3cb396847721882b8a4488abef7 SHA-256: 63486ea338a4e53761033df9ec2f097015c0a9b5a588376055ae130d90774ab1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many pointing to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution via these links. The embedded JavaScript may be used to further obfuscate the malicious redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://laborke.ru/uplcv?utm_term=how+to+train+your+dragon+book+12+pdf
    • https://trexanh.net/upload/files/gekafudanenuwosevuwu.pdf
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/291f7eb0cebc0f1db84f26e8c18725a9/14195444040.pdf
    • http://edgecs.net/documents/86599962527.pdf
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/2a59d2649489db5e6f045b1d25190dfc/sopejajasemavuru.pdf
    • https://vasantviharproperties.com/userfiles/file/40305103057.pdf
    • http://1137.jp/app/webroot/js/ckfinder/userfiles/files/98258061665.pdf
    • https://dynasty888.com/image/files/20210610_002352.pdf
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/l1f4cdojl4tr6iqq91u8ds2etm/74298757486.pdf
    • https://infrastone.com/userfiles/files/xiruxukuvuzefeneri.pdf
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/mesixomunezabagipek.pdf
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/idi26orj6p2of39qi4pvcadonr/16024638926.pdf
    • https://alamansyria.com/userfiles/file/juvif.pdf
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/ecb643469c96fcf36eb50355be0bbc46/giduwa.pdf
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160819e1a54fe5---daxugeso.pdf
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/1b4ace409766eb814c2c2db9af8f4f2b/13223138229.pdf
    • https://paron-rebondir.com/uploads/files/doxowegafipu.pdf
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607461950d8af---rejevatenijaxiginideru.pdf
    • https://numberonerevolution.it/file/85421778567.pdf
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/566fb6d00d42a7b6694897ca1322ab20/46246607495.pdf
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd1c711a724---84692487206.pdf
    • https://vietfun.com.vn/wp-content/plugins/super-forms/uploads/php/files/bhbquek06ula0h4ln5h6sjb5bo/zuvuru.pdf
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd05090fb83---63221327105.pdf
    • http://digifast.cz/userfiles/punusavanevilibeki.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_off0000c718.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC718 16792 bytes
font_01_sfnt_off0000df2f.bin
c8a373d8aefa0c2a0e119c83b74f8cfe08deb09c1cfd235bae8587b0a3fe590b
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF2F 11024 bytes
font_02_sfnt_off0000f897.bin
6ebd928c6082bdafd6adce8623bdecdad427b5bbc519dcfe26cf95e1ee48d6ef
pdf-font-stream PDF embedded font (sfnt) at offset 0xF897 16808 bytes