Malicious PDF — malware analysis report

Static analysis result for SHA-256 89c7a198f4c3b2b8…

MALICIOUS

PDF

89.9 KB Created: 2021-06-26 14:52:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f8a521b7b032a51193d9c299fc5720a1 SHA-1: c435055f0d15d8bf4311b9b94c32c8dfb1f80338 SHA-256: 89c7a198f4c3b2b8881d99ec5e251b202990d949299b3fae1309ab663f0912aa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The file contains numerous links to compromised WordPress upload directories and disposable hosting, suggesting it is designed to redirect users to malicious content. The embedded URLs and the heuristic firings strongly indicate a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/df805a2e501e522cd9a95a3badab54d6/7491841278.pdf
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/dac0da294106aa94ce9900a7774f926a/10854400235.pdf
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c1504e5bc95---90861593293.pdf
    • https://familienbilstrup.dk/userfiles/file/gajuzelakepuvezeji.pdf
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16079811dce2a2---19020211530.pdf
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/gnp931vcd3gcieonsvdaj47e2f/kefevoselazu.pdf
    • http://tropo-design.com/ckfinder/userfiles/files/17830908182.pdf
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/ce476a550c357263741d1c788aadb49e/borolu.pdf
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac6e483ee17---tisije.pdf
    • https://agrolliance.ca/ckfinder/userfiles/files/wunof.pdf
    • https://atamergranit.com/userfiles/file/gikova.pdf
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/u3akmv916ivgvben53cfjrcq8d/fujominerixezajediwamu.pdf
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/09kmcmp01bjmltpmjijj56k5de/94975966978.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c99d36d8a4a---wedudavoremu.pdf
    • https://fnb-concepts.com/images/uploads/files/resegobigekesexidemitetov.pdf
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/a8c7f369bf10c3cf43114152b6fb4fac/ruxumilolawofatogufinig.pdf
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/8f2ec04e3d5afc21571bca7c84db275b/39007236772.pdf
    • http://dtcguild.org/clients/80367/File/vidolavetinuxise.pdf
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/96t91oab71php506fb6sio09a3/timelofada.pdf
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/g8kjs1uasbm5jtnj5snmveuu3q/95201387403.pdf
    • https://amatnieks.com/pictures/image/35173759409.pdf
    • https://noithatkuongthinh.com/uploads/files/5300867381.pdf
    • https://jamurgoreng.net/contents//files/79824245599.pdf
    • http://allmedicus.com/userfiles/file/46396995908.pdf
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/95f3d1d71bf26177ae23f581c9eae880/wakipuvajikodivonikiz.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=chocolate+fondue+with+condensed+milk
    • 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_off0000e209.bin
fcca37035df06e555c2991ff65faa0e8497ca6423bee408ebc46b3aef925b516
pdf-font-stream PDF embedded font (sfnt) at offset 0xE209 16144 bytes
font_01_sfnt_off0000f789.bin
7d7853505b37b9f1f3ff0150ec351dc40eda5584afd7551ad23051fd6a8275a9
pdf-font-stream PDF embedded font (sfnt) at offset 0xF789 10948 bytes
font_02_sfnt_off000110d2.bin
6dfb058dde2968c27e3c1679d233705332d2763952f013db5ae728254a4196aa
pdf-font-stream PDF embedded font (sfnt) at offset 0x110D2 17856 bytes
font_03_sfnt_off00013fea.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13FEA 16792 bytes