Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a99719cbeb6963c…

MALICIOUS

PDF

97.4 KB Created: 2021-07-25 10:30:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e9f173b736119d0953c3e5b5893b0162 SHA-1: 3cc4226e463af3b2fcf15007f8f60e2bb89f54c1 SHA-256: 8a99719cbeb6963c864ba4a26db9216dbe8a000a1bb92fe16e1196f87bb06876
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The document body is heavily obfuscated and unreadable, providing no direct user-facing content, but the overall structure and URL analysis point to a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bd44c3d7a6---vozosi.pdf In PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/5g0lgn0pokoebvqrtu9buoa3d7/wiwepuvibevogevude.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/fetujilibijonemefazolopu.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072a355b0a63---zediwekodeni.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/c4fa8304a6159ea30e74caf25f86ca4c/94215997936.pdfIn PDF document text
    • https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/5plcjdhqjs9ngm78jptib8e699/tikojiduzuribigobiz.pdfIn PDF document text
    • http://tkhomedeco.com/assets/uploads/ckedit/files/20210706181359.pdfIn PDF document text
    • https://belhasasecurity.com/userfiles/file/66873468137.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160e88c605ff54---69745898038.pdfIn PDF document text
    • http://inse.us/uploads/images//files/bituxufumudulipusale.pdfIn PDF document text
    • https://equator-maritime.com/userfiles/file/64965489457.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/5e149515faeaf2ca6a2f0f4d70242a0c/zagosel.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a3019c46495---15489447598.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/97e8b9e8ao700h9egtce5m3uhv/deseduzuji.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/pinabunasegi.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/fa65vv29vqc74fjedbmdqiod80/29286175367.pdfIn PDF document text
    • https://webfox.net.au/wp-content/plugins/super-forms/uploads/php/files/60398212f6fc00c6f2b3875ca9cfbaea/99674814511.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609659253bfc5---41003771117.pdfIn PDF document text
    • http://ithaca1966.com/clients/8/85/85e9e0a76fddb83d7689cebc6ab07fae/File/38752745559.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160add920992c9---7274316159.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160a80a53bbba1---31950490778.pdfIn PDF document text
    • http://lorichphoto.com/pictures/file/ligamadufili.pdfIn PDF document text
    • http://statewideroadservices.com/clients/879378/File/58831471808.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=ejercicios+de+potenciacion+de+numeros+enteros+en+wordPDF 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_off0001176d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1176D 10928 bytes
SHA-256: 26364c5c59202340a4cb77607bbab1bb03f02a917063f4d4f5477c0d8375e02e
font_01_sfnt_off000130ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130BA 18272 bytes
SHA-256: a3f87bb1ab192d30261614aac303262e2e4c77fa97838b403eefbd37898c8d77
font_02_sfnt_off00015edd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EDD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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