Malicious PDF — malware analysis report

Static analysis result for SHA-256 a29ea636a89202d4…

MALICIOUS

PDF

80.6 KB Created: 2021-09-20 04:03:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fb61f0ab2d92266825d456fdddb711e2 SHA-1: 759feee819a323372e8c32f4860632e99c19c394 SHA-256: a29ea636a89202d4ba09a7f359b4d2a47d68affb34479239b4d2d1514a2b9fcf
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm or distribution point. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document's content is designed to trick users into installing malicious software disguised as a browser update or extension.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://archism.ru/uplcv?utm_term=font+style+copy+and+paste PDF link annotation
    • https://transmar.biz/ckfinder/userfiles/files/2871954256.pdfIn PDF document text
    • https://nyirfa.hu/uploads/files/mozokojalamimetasinigeke.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/vababubetase.pdfIn PDF document text
    • http://iktoktatas.hu/files/file/21747012819.pdfIn PDF document text
    • https://zhansq.cn/upload/file/mepariwixu.pdfIn PDF document text
    • https://nucamsa.es/userfiles/files/gogolafu.pdfIn PDF document text
    • http://vipnovini.bg/root/f/uploads/files/kufuligifon.pdfIn PDF document text
    • http://ozgu-yapi.com/firma/files/75565727418.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613caadd81305---64489352773.pdfIn PDF document text
    • https://premium-house.uz/images/file/jagorojuzewevalibit.pdfIn PDF document text
    • https://rivieresoceanie.com/userfiles/file/23809547605.pdfIn PDF document text
    • http://drentmedischadvies.nl/uploads/files/78697467267.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161312740ed78a---66951405905.pdfIn PDF document text
    • https://interior-mark.com/ckfinder/userfiles/files/39351207643.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1612fdcba18591---gogivuxaxaran.pdfIn PDF document text
    • http://rpsbchamber.org/editorData/file/47182696623.pdfIn PDF document text
    • https://sistemkabin.com/ckfinder/userfiles/files/61591692887.pdfIn PDF document text
    • http://myagreement.com/UserFiles/file/gupidaginobasosu.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/15987399190.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/443bbf96aa501df8f7e77ae07fa98a94/zubelatez.pdfIn PDF document text
    • http://www.singchai.co.th/ckfinder/userfiles/files/xumizem.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/161476c7f7a881---29890875968.pdfIn PDF document text
    • http://eptesteplelek.com/uploads/file/90315578240.pdfIn PDF document text
    • http://circuitvietnamcambodge.com/hinhanh/file/jejaduxupuvituderejebetir.pdfIn PDF document text
    • https://fullgame.hu/uploads/files/73861546393.pdfIn PDF document text
    • https://munis-roquesalbes.cat/demo/vilalba/imatges/file/rajomaratoma.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_off0000d9d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1ED 10408 bytes
SHA-256: 1c6337fb766d41615b278477cba1bfb2ce4a5168470d5b106e7eb2b719791ea6
font_02_sfnt_off000109ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109AD 16968 bytes
SHA-256: 28c266177fc61bef6c3ae34e8893dccb71c53c9dfe6643c817215017184dfbb3

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