Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a20486c56c82a07…

MALICIOUS

PDF

75.5 KB Created: 2021-09-06 20:50:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: ca9672f73d45796da49f0f39a325c485 SHA-1: 95a9f8b753ba0216277d16095f727f1bbb60f496 SHA-256: 4a20486c56c82a0765ccaf7954d316400f26dc0bf983b7fc20fc5c965d6e0ad3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to distribute further malicious files or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160721da7bac91---getizilafizokodazel.pdf In PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160762a94917c2---98219167572.pdfIn PDF document text
    • https://himarco.ir/basefile/himarcoir/files/wamaj.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160e62608cdb93---10435119777.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088289c9cb77---refidusakumuborokopad.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/fa47d719f2eb971192123234be0bf807/33598608902.pdfIn PDF document text
    • http://hsiwww.com/image/files/20210722_100226.pdfIn PDF document text
    • https://dursunguney.com/userfiles/files/29278647903.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/c7h7h39q57n7chcmggnlekdmn0/56459288597.pdfIn PDF document text
    • http://maskaevlawyer.ru/userfiles/file/70243090112.pdfIn PDF document text
    • http://tuanlongland.com/upload/files/68568415124.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160abdf1230164---kojegifejakizenalobado.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/u27ub4at0m4e9ir5j9segnec48/wononomonokonidigin.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/987f67210b5a622da902cce2b9d58ea9/jigamupaxowotujisewepesaj.pdfIn PDF document text
    • http://yanartekstil.com/firma/files/bavazavasawov.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/dcfb9c2b75992bb803fa172a46b7431d/43188980575.pdfIn PDF document text
    • https://emprenderem.cl/files/29601547549.pdfIn PDF document text
    • http://domosplast.hu/files/file/bigapugeviluwozinol.pdfIn PDF document text
    • http://www.louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/30557066068.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cjc7mfcelhj36ceckne9mtgjv1/sosig.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/46610920476.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607371b017bd5---47431034574.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/e3840ac17d8b77971f98776063d320d3/9492158210.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=6+month+calendar+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_off0000c4e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4E0 10696 bytes
SHA-256: b7bc16ab6a61b67ffdb578a3bb3dae34c8de47779fb07ac8841ffe58e3457270
font_01_sfnt_off0000dd28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f53a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF53A 16884 bytes
SHA-256: 1fa2f06691966130af07c1c1551d0d39ee0941edb38e2f9322825286409a09bf

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