Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fa6dcdf8cd49dfa…

MALICIOUS

PDF

102.5 KB Created: 2021-07-24 01:46:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 75a8e4be4476d47871cabf8e9e68907c SHA-1: 3be344e5768170f552eff490d7c9b75b7a3c65f9 SHA-256: 2fa6dcdf8cd49dfa37d536ef73817a1e46cc983d356c0f00d0fc3e29a0a03744
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to link farms hosted on compromised WordPress sites and disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to phish or redirect users to malicious content. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://transfertrolley.cn/d/files/94016048647.pdf
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160881a7f61228---34215335209.pdf
    • http://dkmmotor.com/files/userfiles/file/31361082897.pdf
    • http://szao-spb.ru/images/news/file/26845997788.pdf
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e6ae17a28---rubasitatugen.pdf
    • http://hillcresthigh1971.com/clients/9/9f/9fbf9047a6869172a982db6f42f05a9a/File/xetobu.pdf
    • http://hum-lucknow.org/test/fckeditor/file/verade.pdf
    • http://islandpointfl.com/userimages/64789336197.pdf
    • https://cqc-material.com/app/webroot/userfiles/files/73801103623.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/7e1578440920b91c560ae07640e56111/pepekutijiwamiduteli.pdf
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160729b85a7e0e---58009504288.pdf
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a6af5c11e37---taraxa.pdf
    • http://www.tokyomagic.jp/images/library/File/lujoditutekufeje.pdf
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/cccb88006730bd425249860b1e96a390/nafitabu.pdf
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/rlk5sd1o9epaho3l80mt79le4d/diwedasabatudunari.pdf
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8c101fc95---2468612405.pdf
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/io8l6ltqbdljhqkf0dan1rpaj4/96284764761.pdf
    • http://tunglamgarden.com/images/fck/file/nigujov.pdf
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c56a4986481---rekemadiwawifujugezo.pdf
    • http://muzycznescyzoryki.pl/userfiles/file/82265382950.pdf
    • http://aps-mes.com/files/file/31801856386.pdf
    • https://chinatupai.com/web/js/ckfinder/userfiles/files/55291268071.pdf
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa80d17d26c---podugiribat.pdf
    • http://aeronautike.com/userfiles/file/33220349261.pdf
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/8cf37206a250676edfb448512f80d880/68509814937.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=count+by+7s+summary
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000116ba.bin
1a046a537a2bb5106fb428ed6148b5f1433a203777845d067b1d9b1664e39ed9
pdf-font-stream PDF embedded font (sfnt) at offset 0x116BA 17720 bytes
font_01_sfnt_off00014534.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14534 16792 bytes
font_02_sfnt_off00015d4b.bin
b20cda05637e955e731dc6ad0f0d2e6e90d2ae1c1082c1a762558d6d4cefcdb9
pdf-font-stream PDF embedded font (sfnt) at offset 0x15D4B 10436 bytes
font_03_sfnt_off00017512.bin
8bfc5e2f6383778b4716e60c732a7e5228106b692ca52c1f6b3c0b2892049825
pdf-font-stream PDF embedded font (sfnt) at offset 0x17512 16060 bytes