Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e19d80811f2120d…

MALICIOUS

PDF

82.3 KB Created: 2021-09-17 21:10:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: e2cf832969a30d4932dd1ed80a9c37e3 SHA-1: 9266da139307d0f5c2a79d486aca8ae5e9891abc SHA-256: 8e19d80811f2120d4c029de5bb938f86580d2329eaf4c7216f20090810958719
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains embedded JavaScript, which is a common technique for executing malicious code within PDF documents. The document also features numerous external links, some pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm or phishing attempt. The presence of embedded JavaScript indicates an attempt to download and execute further payloads or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://www.dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/sixegorexexi.pdf In PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/vilup.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/161356bc0af275---4508585998.pdfIn PDF document text
    • http://jtylek.pl/Upload/file/82532416992.pdfIn PDF document text
    • http://cl-pub.com/files/files/16061602837.pdfIn PDF document text
    • https://equinox-e.com/upload/UserFiles/file/kemepogubafojore.pdfIn PDF document text
    • http://countryclaim.cz/userfiles/file/buzarinurovomilajaloka.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/18552996165.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/121948053488.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae6e1100eb---werexixezulotawagokuxob.pdfIn PDF document text
    • http://3e3i.com/UserFiles/file///28168951031.pdfIn PDF document text
    • https://gameadvisers.com/js/new/fckeditor/userfiles/file/55026876492.pdfIn PDF document text
    • https://pcetravel.com/files/file/xigefux.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/04e7ded18a818b166c25d59d92af778a/rawutarobogetilawowabedof.pdfIn PDF document text
    • http://cuacongtudongbinhduong.com/upload/files/wofixekizezona.pdfIn PDF document text
    • https://bibliotheque-des-arts.com/ckfinder/userfiles/files/71769744564.pdfIn PDF document text
    • http://fandimnarodaku.cz/upload/file/9402912727.pdfIn PDF document text
    • http://cablexconsulting.com/Upload/file/75014888033.pdfIn PDF document text
    • http://marymo.ru/uploads/files/49035560828.pdfIn PDF document text
    • http://dlzhrjd.com/images/uploadfile/files/bisojisajiditolu.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138c700bbb64---30445357808.pdfIn PDF document text
    • http://aalzkj.love-mrt.com/upload/files/fasifo.pdfIn PDF document text
    • https://immsac.pe/sgi_userfiles/userfiles/files/dejefowamibixaxole.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/b61a4d06a946e53aa81dcedb8be84388/zugexafuzowiwasugon.pdfIn PDF document text
    • http://ksklinika.ru/ckfinder/userfiles/files/suvezexagexipuxibaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=one+piece+treasure+cruise+mod+gemsPDF link annotation
    • 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_off0000db3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB3D 10936 bytes
SHA-256: a2277b4ecbf5b8e146f3ccf3386c3d312b812af86f5089eeaabc8da0f12cfccd
font_01_sfnt_off0000f468.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF468 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C7A 18160 bytes
SHA-256: 8d872cead622f671e7156e548eba7558f464ad75fedfc314193ba07626e38161

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