Malicious PDF — malware analysis report

Static analysis result for SHA-256 4090eb64f2eece12…

MALICIOUS

PDF

84.0 KB Created: 2021-09-18 21:11:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: afb6537e1b5208f00037795cc96c381e SHA-1: 7efb97ece1b7aacf0ff347c4ce02756718b7e6d6 SHA-256: 4090eb64f2eece120d4225fab66d35580cf588c35bb6f2eee526c226e7dfadcf
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests the document may be part of a multi-stage attack where the user is prompted to open a password-protected archive.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://archism.ru/uplcv?utm_term=project+free+tv+mandalorian PDF link annotation
    • http://thaimassagemodel.com/ckfinder/userfiles/files/98821084848.pdfIn PDF document text
    • https://terrebleue.org/userfiles/file/80402165353.pdfIn PDF document text
    • http://inteko-tula.ru/f/file/73532540522.pdfIn PDF document text
    • https://threadworx.com/thread/admin/uploads/file/40977693722.pdfIn PDF document text
    • http://amongelite.com/ci/userfiles/files/17832574932.pdfIn PDF document text
    • https://webmakler.org/userfiles/file/30571973133.pdfIn PDF document text
    • https://giverny-bkk.com/upload/files/nifogu.pdfIn PDF document text
    • https://ibrahimkoc.com/images/Media/files/nomigegawameg.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613b411c28a1b---41759083730.pdfIn PDF document text
    • http://aurora-c.jp/files/files/kapuzijisisirabebirunen.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/16135096d0cde0---99244728598.pdfIn PDF document text
    • https://membermimpi.com/contents/files/16212437237.pdfIn PDF document text
    • http://machi-tomo.xyz/js/ckfinder/userfiles/files/waxegaxixeba.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/17634620926.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/77275528967.pdfIn PDF document text
    • https://cosonnguyenthanh.vn/webroot/userfiles/files/zawubifadam.pdfIn PDF document text
    • http://tevukasveza.lt/ckfinder/userfiles/files/63919280731.pdfIn PDF document text
    • https://lazeo.nl/userfiles/file/satikulogukumavu.pdfIn PDF document text
    • https://bankkartya.hu/js/ckfinder/userfiles/files/93235703118.pdfIn PDF document text
    • http://connectcontrol.net/files/userfiles/files/sarijusegoni.pdfIn PDF document text
    • http://bycongroup.com/UserFiles/file/40476767457.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613239756bf82---35006994595.pdfIn PDF document text
    • https://www.karelo.com/uploads/File/65330359403.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_off0000e26d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE26D 18608 bytes
SHA-256: e89e37b7c55ddd710b5116a7cc4f17d02f245f26bce310d89ce13d8396e26e3c
font_01_sfnt_off0001127a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1127A 10664 bytes
SHA-256: 99aa6165b6c7ab5becbfb6073350da7a225dd617c6a279a208f3f60674590008
font_02_sfnt_off00012ae2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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