Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0e89fe09d78391f…

MALICIOUS

PDF

96.7 KB Created: 2021-08-24 02:09:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4b8bb940e8a126c60ed8aecd6c32ca2a SHA-1: b751e1b90fe066218d6dd7a95b9d0480ae09438d SHA-256: a0e89fe09d78391f4192a4dfeaaa853c70f7444d0ea0372cf9de4eae6629bddd
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous URLs, many hosted on compromised WordPress sites and disposable domains, suggesting a tactic to distribute malicious content or manipulate search engine results. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.greenlakecruises.com/ckfinder/userfiles/files/danugigubipuzujejisunu.pdf In PDF document text
    • http://matstravel.ru/userfiles/file/nefeleg.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/9ab727c18b7c6de1b64fd5517a8a3754/21895186972.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/fbd5a879f70978469fa88b102cfc5455/48798496738.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/48952848453.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/0d5fb722eff0db0d4ede0531bec46c2b/42351898117.pdfIn PDF document text
    • https://remoteyourstaff.com/calisma2/files/uploads/marivakudin.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac018472f75---4435413649.pdfIn PDF document text
    • http://e-district.org/userfiles/file/loborokedilalaninuten.pdfIn PDF document text
    • http://hmconcretemixingplant.ru/d/files/62551012041.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16070319758c0f---63846473091.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/16070f5585870e---xurusurajidi.pdfIn PDF document text
    • http://petraifevronii.ru/ckfinder/userfiles/files/85215568898.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/u6ibl7of3296o361bd0s8n8j27/kufofojugetarone.pdfIn PDF document text
    • https://ahha.az/userfiles/file/27578092486.pdfIn PDF document text
    • https://brothers-music.com/ckfinder/userfiles/files/61910820026.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/01115f2eebbd36cbedc19faeb2fbb251/somibulazujawobusenu.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/c74tshu02pq1i3tl0igcep03eu/48326778335.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/lelikilutavoseduxexuk.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b7149fe97---75776568790.pdfIn PDF document text
    • http://tc-antey.ru/uploads/files/45435161455.pdfIn PDF document text
    • http://cristalensi.com/public/File/59301335921.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=pepe+le+pew+charactersPDF 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_off00011868.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11868 17552 bytes
SHA-256: 7f1db3934b89c92d9d60e034dbe78258bdd8a6a2ca59c412b5a79717db03949f
font_01_sfnt_off000145e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015df8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DF8 10240 bytes
SHA-256: f9774e25881cd5b23d7b5a585d21abc84ae2ae6ac53740447195919a5b07c684

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