Malicious PDF — malware analysis report

Static analysis result for SHA-256 34cd3e2594a9dafd…

MALICIOUS

PDF

89.5 KB Created: 2021-08-02 21:13:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0288586068d3c9e05e8ebd11dc5c4f00 SHA-1: b9a88a014a8f3016ad445365d9f9e8c2a3d4455f SHA-256: 34cd3e2594a9dafd86884dff6d50f89518005785e4a97ae037f1b1d611ec95a6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, and it contains embedded JavaScript. The PDF also includes numerous links pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to lure users to malicious content or download further payloads. The presence of JavaScript indicates an active exploitation attempt within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/1f40c8b91b2dbb9e2ebeffd7d894d697/roluwogefukanaguxalajera.pdf
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f130346c713---sogitokunu.pdf
    • https://jiu-hang.com/upfiles/editor/files/64468730490.pdf
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160eca973c05d7---38974162642.pdf
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a31f2e33a55---3939113300.pdf
    • http://flywings.sk/UserFiles/file/paladewuxalafune.pdf
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/ur642le89sh0eus3p0i4c72178/42065928679.pdf
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/ps00m61blqafhq6edlqvksie5o/8116451204.pdf
    • https://777mto.info/contents//files/30573036166.pdf
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/tpfss2clt7kn4oamjku4s4ghdd/14426210585.pdf
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160cf3ffc1e7bf---31009265174.pdf
    • https://konferencii.ru/js/ckfinder/userfiles/files/dolarinikumelobajuruxapo.pdf
    • http://inhome360.ru/admin/ckfinder/userfiles/files/padamin.pdf
    • http://yule-sign.com/upload/editor/file/20210707104405.pdf
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/557shmamlj630e7470tgmdl4h7/duzib.pdf
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/6e6e06e83714d6732d21f5ec614d48d4/vebegonubiduz.pdf
    • https://soroptimist.be/oldsite/intranet/ckeditor/ckfinder/userfiles/images//files/40999990857.pdf
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/ba5cef33fcccb1ce59e06312a5d25ef5/92960838757.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607da79b27501---27824524156.pdf
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/edfe81dff0a264da589977e3984cafc6/1537473178.pdf
    • https://mujeresenmovimientoplus.com/userfiles/file/70826333360.pdf
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/ed2630ef8307be38b6cc9b32c97a25bb/rinufarilulujirovedekov.pdf
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/a3fcb36907a7add88b0edc36452fd00a/soguti.pdf
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1609c82dd730e5---womowuvatezebenavelad.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=what+is+the+difference+between+expansionary+and+contractionary+fiscal+policy
    • 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_off0000f7e2.bin
4c99197fbcc58dfa1dd94f3095999a96ba98fa6f69060abd97d8a8972c4e9c65
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E2 11152 bytes
font_01_sfnt_off000111bc.bin
6f621bcc3c31ef44bb678ffc7bcdde853a188cd96c1f11751e306fe21a0c5153
pdf-font-stream PDF embedded font (sfnt) at offset 0x111BC 17168 bytes
font_02_sfnt_off00013e79.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13E79 16792 bytes