Malicious PDF — malware analysis report

Static analysis result for SHA-256 80f1258f6b36bf65…

MALICIOUS

PDF

70.7 KB Created: 2021-09-20 15:12:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 062a977790b63384efc4ee8e16941190 SHA-1: 9682b6f0acab60bf9f02cfa6e6e103aa4f167afb SHA-256: 80f1258f6b36bf65e7d9f0257af55fd993c69d7041842e230e4b1f333b2e95c6
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs pointing to compromised websites, including WordPress upload directories. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classification strongly indicated maliciousness. The embedded JavaScript and link farm structure suggest an attempt to redirect users to malicious content, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://nomylo.ru/uplcv?utm_term=android+sex+games+download PDF link annotation
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/93mn9o1lkhe54amk471127kjg4/98834357996.pdfIn PDF document text
    • http://vinhthuanvietnam.com/upload/files/rubalivo.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613fedd29419c---gines.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/161368709a162b---regekikunugofoxebe.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/161436ff436225---gusipisenupulowasese.pdfIn PDF document text
    • http://inoxbienhoa.com/upload/files/sivesumudetes.pdfIn PDF document text
    • http://tipkeo.com/js/ckfinder/userfiles/files/11631458512.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/lofafi.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16131bbe7b4a88---mufeni.pdfIn PDF document text
    • http://nagakuratrading.com/js/upload/files/96997699811.pdfIn PDF document text
    • https://www.domaine-vrignaud.com/ckfinder/userfiles/files/kubikejebefonilatos.pdfIn PDF document text
    • https://posaonakosovu.com/ckfinder/userfiles/files/sesazavizusomibogi.pdfIn PDF document text
    • http://phutungvespaco.com/luutru/files/pujiriwipoxob.pdfIn PDF document text
    • https://pepsima.biz/files/file/32337198785.pdfIn PDF document text
    • http://bbbo.handyfriendship.com/upload/files/supadejo.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/kamivezexewawenuge.pdfIn PDF document text
    • https://carparts-fixture.com/file/file/wimodufufoj.pdfIn PDF document text
    • http://alhambra.kopanramen.com/uploads/files/86890846400.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613836ea25b46---81376960835.pdfIn PDF document text
    • http://ajk-opakowania.eu/upload/fck/file/xedevukopuxevame.pdfIn PDF document text
    • http://improntediteatro.it/userfiles/files/74111333308.pdfIn PDF document text
    • http://nguoiquangphianam.com/uploads/files/46091731854.pdfIn PDF document text
    • https://bcm.es/files/galeria/files/85835351478.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/wujajugewugujiroxepi.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_off0000b6ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6CE 10664 bytes
SHA-256: 87eae15f0a6fa9def27c5f3069330c1273bb9d2dff16afa8b6d171d4036cd178
font_01_sfnt_off0000cf14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e726.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE726 15164 bytes
SHA-256: 2cf6593d645dcc7d53820762962f02abbd838a655afb17076b137432c2664476

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