Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd22ad833ec19a14…

MALICIOUS

PDF

97.7 KB Created: 2021-09-07 05:04:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1395e098116892b58f00fa53ae05a120 SHA-1: c2f37b6db556409884f7e8407d29336aff172b11 SHA-256: bd22ad833ec19a14f2f565388357b3a6ba7e4dc8f24afe5e29fcf4c529e371a6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan PDF. It contains numerous links to external websites, many hosted on compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest the document is intended to lead users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

Heuristics 6

  • 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.
  • 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://queure.ru/uplcv?utm_term=emulsifying+agents+pdf PDF link annotation
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16075f08fee39e---69948239358.pdfIn PDF document text
    • http://ajarnveerapong.com/UserFiles/file/87391090318.pdfIn PDF document text
    • http://pb-book.com/user_file/file/varoverowiku.pdfIn PDF document text
    • http://bluelakehomestay.com/uploads/image/files/77740587361.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/2b6a63174479c38326dfaecd22c14a9d/monolerogaxixatudezug.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b508ddf881---turokopixujeruropedot.pdfIn PDF document text
    • https://solener.info/ckfinder/userfiles/files/xubikiboxanuleres.pdfIn PDF document text
    • https://vico-domrep.com/ckfinder/userfiles/files/rusebojiwutokuxugapopad.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/2dde9a98eacbd11f50e7c859b81baf3e/46187943900.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/b8a02b42195a645f837f5b81ef49b76b/8024915709.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5dc287fbd---fotupamuxezitamovi.pdfIn PDF document text
    • http://lulanjina.net/upload/files/lowimadabujekerefod.pdfIn PDF document text
    • http://mosjob.ru/images/file/sumaluzi.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/0209ad3f6a1fd3b6bf0c555e9936f5ee/42155204871.pdfIn PDF document text
    • https://ehotelgateway.com/bot/ckfinder/uf/files/97855657038.pdfIn PDF document text
    • http://gomientrung.vn/uploads/image/files/36310747987.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2039a4d672---kalatodimewelutuvexo.pdfIn PDF document text
    • http://gzmzwl.com/Uploadfiles/files/losixepivo.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/dd06e6955a86f788860e8c8a553e990b/vefesuzareremo.pdfIn PDF document text
    • http://funagamex.vn/PhuongNamGroup/userfiles/files/vatujetusifetivawim.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/96222433929.pdfIn PDF document text
    • http://pm-property.pl/userfiles/file/janinuruwoserivuxezolawu.pdfIn PDF document text
    • http://bisenzia.it/userfiles/files/sexexov.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_off00011744.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11744 10816 bytes
SHA-256: cf5193b34c43ceec222769cf7e66c2b55dfbf1c0e14ba3613fcc2e6642aa9394
font_01_sfnt_off00012ffb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FFB 19028 bytes
SHA-256: f696fd10a943f31115f5bd514c26a334481bee556032c39ae66191a8eb16bc19
font_02_sfnt_off00016192.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16192 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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