Malicious PDF — malware analysis report

Static analysis result for SHA-256 b61b805cb31e95b3…

MALICIOUS

PDF

73.4 KB Created: 2021-06-22 12:02:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 006e943470975f80b80a959fa35d0856 SHA-1: 56a4fb10eebee7e883e27e52b2dc3bc9f27112f1 SHA-256: b61b805cb31e95b30cf433936a6320f0de9f640a8c7aba32974357cb06afabce
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The embedded JavaScript is likely used to facilitate these redirects or obfuscate the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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=phrasal+verbs+with+in+and+out+pdf
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/ibiitc14jj4rrre04l2ca2st57/sokorinobogufupal.pdf
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/zawudit.pdf
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160792238f3301---81125725729.pdf
    • https://charterfori.ir/basefile/charterforiir/files/28799864127.pdf
    • http://studiotecnicoarduini.eu/userfiles/files/vusozot.pdf
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/vadoxo.pdf
    • http://webdulich.com/js/ckfinder/userfiles/files/jaxemubonibu.pdf
    • http://weddingceremoniesbybev.com/clients/72651/File/xivoze.pdf
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160946e217e630---jiduxuwuzuvafavarudajofif.pdf
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d147cc7b43a34baaa92abc5b69621373/lafalafivifavudesuz.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a9cfd6c4f3e---8542583463.pdf
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfd8c89bce0---kuvixuxes.pdf
    • https://reitinguok.lt/userfiles/file/makevabowosedonofiwofoli.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e013.bin
c1495a36b625a5a4281c94676627e46128c948e4ee736f476dd6af6c659277a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE013 5420 bytes
font_01_sfnt_off0000f288.bin
956a2a9d7b4c908f793d3afb5f70190f8f88035ed5f8f2fb65796f1bb8e4afa3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF288 10648 bytes

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