Malicious PDF — malware analysis report

Static analysis result for SHA-256 16fd4782eb3da010…

MALICIOUS

PDF

85.7 KB Created: 2021-09-06 16:29:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0b1ea1d888f62096ad80f16ed81298f2 SHA-1: b692f2d3031fe387ea914fa779fe465673f38470 SHA-256: 16fd4782eb3da010f7d388ec69cde9e2efc9cd5c5fff8ba34c0e556963ca3b74
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was flagged as malicious by a machine learning classifier and ClamAV. It contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to distribute malicious content or engage in SEO manipulation. The presence of these links suggests an attempt to direct users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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.
  • 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://tavio.ru/files/file/jogetumuwanava.pdf In PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16091a474ae948---68456765455.pdfIn PDF document text
    • http://qazaqbanki.kz/data/content/files/dijegigiban.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/ruxomabo.pdfIn PDF document text
    • https://georeno.ca/userfiles/files/34771352042.pdfIn PDF document text
    • https://avukat.dnsaktif.net/upload/files/wujexopafogiloxuwixu.pdfIn PDF document text
    • http://inwama4.vn/webroot/img/files/puziraxilasodeberab.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/a9a89cef69d8bc25a999aecc4abe1bac/savikumugarame.pdfIn PDF document text
    • http://hoctienganh123.net/upload/files/gulutabuja.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c85cbc43eda---54339469991.pdfIn PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/25791207806.pdfIn PDF document text
    • http://dh-life.com/ckfinder/userfiles/files/22543079748.pdfIn PDF document text
    • http://cnwt.mgo.cool/upfile/files/2021/08/22/27908919434.pdfIn PDF document text
    • http://quatanggiabao.com/images/uploads/files/xefitituka.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/46ecd11231111a96caef82c80139b852/morenufuxexosamuw.pdfIn PDF document text
    • http://ndc-group.ru/uploads/files/9310344128.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/kifobami.pdfIn PDF document text
    • http://frappsreagent.com/upload/files/viwubakasu.pdfIn PDF document text
    • https://www.pharmawell.eu/ckfinder/userfiles/files/furoximuxo.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c2a4aac62f8---95743259552.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160866492b036b---vebup.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090c049d7fd2---96532669771.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=preschool+english+lessons+pdfPDF 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_off0000ec63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC63 10640 bytes
SHA-256: d58b2c39b37f441ec3fc49501e7d0ea1af32a9a3ae07fb95c3bf9b31af95069c
font_01_sfnt_off00010467.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10467 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C79 17136 bytes
SHA-256: f831d69b7435324f00e02d1356e0899ec01cc6b8383af00288360d0d02aeb0a2

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