Malicious PDF — malware analysis report

Static analysis result for SHA-256 5df9eb2ca8edec5e…

MALICIOUS

PDF

89.0 KB Created: 2021-08-10 07:13:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c6e6ab17313a7fe1217085b93214c402 SHA-1: 0a20fdd11f50221055c7d91b727c69667134594a SHA-256: 5df9eb2ca8edec5e9894dc3fc1669d08b0aa76e0d48aba77b2c5dbb9fe71b17d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded links are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160caba543456b---27235687771.pdf In PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce83569d97---nadudukarowegofovopeno.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/4228718126b2b5570aecf10094dc66c9/bozanizutumisa.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/7s1r27gejg78a3vf8co0ajcf88/27786952438.pdfIn PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/32352508048.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/5b5a031af0a614fb13039ec1517a87ef/56602620024.pdfIn PDF document text
    • https://porterbrothersltd.com/app/webroot/uploads/bigusakiveduwo.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/aul7262asli27ucfa8pa045d63/nezimomaterilowagezelilit.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/916bc0530c6a61e22aa0f5e4c2589985/xazix.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/d0b1ec17bb9160f902b307acd2488fe8/69652474237.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606f84bacbe21---88696342161.pdfIn PDF document text
    • http://coffee33.ru/archive/file/92848915716.pdfIn PDF document text
    • http://www.siposferenc.hu/html/nemolenobuzevezazelu.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/9d28cb1f2697453d6faee466f2c74793/73399464826.pdfIn PDF document text
    • https://asi-filter.pl/files/file/23186240490.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/51758555119.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/minuwukupunafidulaned.pdfIn PDF document text
    • http://2sisaccount.com/userfiles/files/fizedazojefidu.pdfIn PDF document text
    • http://vencedor.coop/images/admin/file/3455346135.pdfIn PDF document text
    • https://deycaterers.com/ckfinder/userfiles/files/66460036904.pdfIn PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/89536478108.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e43d6c0f5---60137813523.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/b4c9ea590c88c23de856eb64cd726ae1/mogawusedage.pdfIn PDF document text
    • http://atek-ent.com/upload/file/surifiripob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=troy-bilt+riding+lawn+mower+parts+diagramPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce3d671d0e---renamojubibemabiw.pdfIn PDF document text
    • 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_off0000f5e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E6 17288 bytes
SHA-256: 9ec004c4e04957820e482fce948d64fd8cc21ece75d4c397232c8df7477c48ba
font_01_sfnt_off0001233a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1233A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013b51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B51 11072 bytes
SHA-256: 2c0dcd002e2b9d182ff72234c521617d1348e3a7a4d1a4dc7908a6e102298427

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