Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5fc1e176f77bbf6…

MALICIOUS

PDF

80.4 KB Created: 2021-09-21 01:49:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 59f2887b17eed4a30bfca9527bb809a3 SHA-1: d88426722c1c093570b6d79e7f4aa0810fa26678 SHA-256: e5fc1e176f77bbf6db914caa2408afc872ac3c721be89f62128e776a177805e6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised CMS upload storage or appear to be part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pixomot.ru/uplcv?utm_term=pocket+heroes+mod PDF link annotation
    • https://alohasafaris.com/files/birukabezepefos.pdfIn PDF document text
    • http://pescepiana.eu/userfiles/files/37212208036.pdfIn PDF document text
    • https://asiahealthcaredentalcentre.com/ckfinder/userfiles/files/sevano.pdfIn PDF document text
    • https://5udua.com/contents/files/gelavimenusivuwovazatep.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/67392496255.pdfIn PDF document text
    • https://thefertilizergranulators.com/d/files/gajesutepaxukosorexi.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/ll42dpll5t85m35u96qvcuo9gc/44413802443.pdfIn PDF document text
    • https://pasarantogel2.com/contents/files/taputolubo.pdfIn PDF document text
    • https://ostrichtours.com/ckfinder/userfiles/files/sejuloxiwowegulaxapata.pdfIn PDF document text
    • http://studiotipaldo.com/userfiles/files/venupegixepiwazejemugize.pdfIn PDF document text
    • http://gpsputhuppally.com/userfiles/file/ruxivubatodafo.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/7f4611b23be02ae1554e650687572322/newaguduledoxegum.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1614874fcc3c4c---50623961215.pdfIn PDF document text
    • http://windmill-bv.com/userfiles/files/mujisijagoxupogomumunu.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1613c851f48437---vonofe.pdfIn PDF document text
    • http://www.portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/19484287087.pdfIn PDF document text
    • http://myredm.ru/uploads/file/metilipede.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb08f446bc---32236002107.pdfIn PDF document text
    • http://aodaiminhhanh.com/app/webroot/uploads/files/42599020786.pdfIn PDF document text
    • http://apart1day.ru/file/setife.pdfIn PDF document text
    • http://ordinate-ltd.com/file_media/file_image/file/wutewesezojufifawoniz.pdfIn PDF document text
    • https://swift-tw.com/lcc/upload/files/karumebiwotemigovirawan.pdfIn PDF document text
    • https://xn--z4qq44i.tw/upload/actfiles/wapabasijemu.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d62c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD62C 10324 bytes
SHA-256: 1162fd85b226c78b58580fb5607819a82f97aea8e736a4cf963e326ef12a6a5e
font_01_sfnt_off0000ed88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED88 18148 bytes
SHA-256: 4da725ea947b3dedbd7d833e508e20bc489b36b8b320bf53251efa8cbc0575b0
font_02_sfnt_off00011c39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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