Malicious PDF — malware analysis report

Static analysis result for SHA-256 5db62a0438331390…

MALICIOUS

PDF

79.9 KB Created: 2021-08-04 18:05:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9280300d900e4e6c439020192100b438 SHA-1: 39f45c58b0508691eb2c0951f13afb3666bd4bb2 SHA-256: 5db62a04383313902c2ddbb0ab9f4ed8e4c4c0d3d3346de395a4ca0235fa7524
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it functions as a link farm to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://irlanc.ru/uplcv?utm_term=divisible+by+728
    • http://dedanskecasinoer.dk/userfiles/file/28259016961.pdf
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/jopasabe.pdf
    • https://aduanaldelvalle.com/userfiles/file/mubunifevininavepamojuk.pdf
    • http://abwingscolley.com/uploads/files/63518686623.pdf
    • https://afra24.com/basefile/afra24/files/13377912736.pdf
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609d46cf995db---57884171601.pdf
    • http://ridgefieldpark1967.com/clients/3/39/39eebdc8797e30ee23d4fd57d071fd44/File/jopuleziputibafibenatobu.pdf
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/8828c88bbe54a42388e8f5247815cfb2/kesumalonatefik.pdf
    • https://sanvexe.vn/webroot/img/files/rovibaku.pdf
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3196ddc49---46143040709.pdf
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa4e953897---7243880103.pdf
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/f2582bd778b0d7f398713a723b89510f/41837860054.pdf
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/2575cd21ceb813a92f21ec32965da296/68279845383.pdf
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/e9ea06686ebd1589eb9fd1c995e492d1/xogaxajanalepuma.pdf
    • http://ekonopuntos.com/campannas/file/rexujuxuxuradu.pdf
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/6d7e8e3c065b948e077f2dc40aab9fc7/dulutidaroli.pdf
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099cca754934---xalisomititoz.pdf
    • https://i3mit.com/shopadmin/upload/files/woniweruzi.pdf
    • http://shsclassof1959.com/clients/a/a7/a7a82b2a6025f7fafce5d77be70bf845/File/zexozizu.pdf
    • http://residencecarlofelice.com/userfiles/files/5953998772.pdf
    • http://vimbark.sk/editor_uploads/files/buxadu.pdf
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1610388e2595ea---3812581992.pdf
    • https://ludifrance.fr/userfiles/file/kanufekuwo.pdf
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/2d8cbc73b7ecad6d8c58647666f33903/gukevukebawavefozozowekoz.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d755.bin
36633d20f74683adf920a24cb40338e1d9ec7db52abaf6541a7a50cb56849a57
pdf-font-stream PDF embedded font (sfnt) at offset 0xD755 10216 bytes
font_01_sfnt_off0000ee80.bin
a180cc5846588a7c60d3f711e434af958ff0d6307722a461852ba9786a7abc63
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE80 16696 bytes
font_02_sfnt_off000119d9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x119D9 16792 bytes