Malicious PDF — malware analysis report

Static analysis result for SHA-256 400211d7dea5ae2f…

MALICIOUS

PDF

93.4 KB Created: 2021-07-03 03:26:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d257b216c853ef8220f1b2f1b7796d48 SHA-1: e10728a79c3824fd4d1fdc10c535922cedfa3e63 SHA-256: 400211d7dea5ae2fc84117163c992a13f6bb30110116a31ce32ddb81c5df3925
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and other disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, but the structure and URL analysis point to a link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/f61568e71f22c97b0d18933ff8509ec7/93205841320.pdf In PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160727752cbc8f---vikafexesixafavel.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/97364307357.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160c4993bb7578---47102213720.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/03f8d761f3d5accc66add76077fb6331/botejoguvefusawonadoj.pdfIn PDF document text
    • http://beergolfers.com./blog/images/file/kelukuxakefawoxime.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609a96fe1d957---talezetejenas.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4e157e586---luledijupute.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/6218281750.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8be92df3ce---zizosewupuwukamu.pdfIn PDF document text
    • http://agarimo.com/archivos/archivos/72920910629.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086fff74ef33---42075877260.pdfIn PDF document text
    • https://ebooksweb.net/files/file/55420426359.pdfIn PDF document text
    • https://dichvuketoanvn.org/uploads/files/kunewudopopinituxubej.pdfIn PDF document text
    • http://allycatering.com/userfiles/37323507670.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607111ce972fb---tigiluraduxadafikegir.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/4624347054.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/30751685807.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5c9f2cc191---wilowivafagasuvudos.pdfIn PDF document text
    • http://aimic.com/userfiles/file/lerinurinanonor.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a304f7cce64---wufulurulutixeru.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab49493144d---wusajekezozasozi.pdfIn PDF document text
    • http://zonweringbelgie.nl/ckfinder/userfiles/files/varejug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=the+power+of+positive+feedbackPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001076c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1076C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011f7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F7E 17480 bytes
SHA-256: fc3d1771a02a5eb689e70eb1ed80dcf6260b6c39b4738da02d47cb67fed20936
font_02_sfnt_off00014d70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D70 10912 bytes
SHA-256: 1ecc2d2349e4f4722c9c5c540cb0fbea7e186c29fa1f9610d03a195aeebc1636

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