Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ad06228b20b999a…

MALICIOUS

PDF

96.4 KB Created: 2021-06-27 20:26:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: f826faac2fbee8260ad806654d414254 SHA-1: 8c9b5b8bb5d4db1fd07ce78115ce756c90a92909 SHA-256: 4ad06228b20b999a9df81486a5365fbb8eaabed684bbdce9cbfdd0bbf76b3f6f
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to compromised websites, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple links on potentially compromised CMS upload storage and disposable hosting reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://abnicum.com/files/file/xivumeg.pdf In PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160988742712e4---gozokegomurugus.pdfIn PDF document text
    • https://taevlingar.se/images/pages/file/gaxoserobevo.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/28i25dlvpdumn1sbu5gtff7823/wijutefefozefulijefefozib.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/5e8aa7e92f1645615c98a5118af1e1e9/96306132909.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/75751159606.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b991f03e472---61043759704.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b2476096c9f---dopugizelilugivapaxel.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16095af3ea7ce6---68221311764.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/lopipi.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/puxamo.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/bf90e2803adbec18a8a9d89adb710b9a/baxopezofizevejuxuwuban.pdfIn PDF document text
    • https://dolmalatrek.com/userfiles/file/76980781982.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/42f3d9f57e13446a1e2f258803f82f76/gerusamilomoxa.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3d34816f6---47340060872.pdfIn PDF document text
    • http://sieuthivatlieuhoanthien.com/upload/files/zudajar.pdfIn PDF document text
    • http://twfindia.in/userfiles/files/puparazelulela.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608173a53fd98---95321953577.pdfIn PDF document text
    • https://delaneyllc.com/ckfinder/userfiles/files/pomogesolon.pdfIn PDF document text
    • http://letsbelegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/75812838389.pdfIn PDF document text
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b486362319---raxufafenepajugolito.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=job+interviews+question+and+answersPDF 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_off000117ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117EA 10724 bytes
SHA-256: 12ecf2d6793e960273e33ad70274dc295171479a123a119d8fb7801fae35a20c
font_01_sfnt_off0001308d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1308D 16836 bytes
SHA-256: 9c77f9e5ad2e3302f320bc1e14f19739f2e4adb25263c71748a662da3c6f4eba
font_02_sfnt_off00015c38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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