Malicious PDF — malware analysis report

Static analysis result for SHA-256 66e4e5342ebe0b19…

MALICIOUS

PDF

76.5 KB Created: 2021-06-27 16:24:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e08be5eb9f4fd785db1ea9e7cd76286a SHA-1: 990a4a541c5f3370de1789e72c641356ca392953 SHA-256: 66e4e5342ebe0b19dcb90ece8d037acb7b89be08ad5ce6492784957f8e94e1e0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to numerous compromised WordPress upload directories and disposable hosting sites, suggesting an attempt to distribute malicious content or conduct phishing. The document body is unreadable, but the presence of numerous external links strongly indicates a malicious intent to redirect the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://blindnow.com/userfiles/file/81160897733.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c338179d2ad---95280411621.pdf
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/91865c4704494dbbf85283af800f9eba/gularuzobuzelesur.pdf
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d0e9135c26---6633842426.pdf
    • http://www.reenactmentmarket.eu/images/wyswig_images/file/50906148719.pdf
    • http://grandp.ru/userfiles/file/rawubax.pdf
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/1bnc3i63cog2406769tvj2ati5/49420603183.pdf
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2a63b9888---69204422327.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/5tjcarqa2e60s9qv8lkvt37gb4/fosigalunifalelugo.pdf
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/6ce73c8095ff610626ed7917e8125c53/kosulebebudibaxagu.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/a251de6ba2afd945707d8b28a6544388/96467875061.pdf
    • https://strategieb2b.com/userfiles/file/mifigirojuxugurimeritiv.pdf
    • http://info56.ru/userfiles/file/fimojovinugekaralivurerev.pdf
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607596ffab291---pisomuvobizuwuwizos.pdf
    • http://memphiscentral1969.com/clients/865565/File/46419646151.pdf
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608355edee0b9---zupos.pdf
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/836e3ea311d8830ff70aa1e5d4337aff/19887308557.pdf
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16086cad3426fb---rojomuzaje.pdf
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b7777c5ad4---50112554253.pdf
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c39327680bf---78434640210.pdf
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083747f0babc---18610095270.pdf
    • http://toeicspeaking.net/_UploadFile/Images/file/51898506390.pdf
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16070723b687fd---fonababedufo.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=crossword+clues+night+answers
    • 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_off0000c88a.bin
4181a2ea770ad166f045c771dce5fbab40977a41c89db61a36ca3a43751444b8
pdf-font-stream PDF embedded font (sfnt) at offset 0xC88A 17104 bytes
font_01_sfnt_off0000f50a.bin
9a9b26051ed929b80a354264532a071dcc219703d8e2c56d56993fa97908c6f8
pdf-font-stream PDF embedded font (sfnt) at offset 0xF50A 10868 bytes
font_02_sfnt_off00010df4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF4 16792 bytes