Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d355ad5609c53f9…

MALICIOUS

PDF

75.2 KB Created: 2021-09-01 13:20:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7ff6c2448e3e169e9475d90c34bad647 SHA-1: 9eda0a213d182be9d1418805f5211bcc07a48f39 SHA-256: 2d355ad5609c53f935624bd8b14b1d70b402c70817ab74dd2e5a808c7390d703
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains numerous links to external websites, many hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the nature of the link farm and the trojan detection points towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://drafthe.ru/uplcv?utm_term=thrombogenic+medical+definition PDF link annotation
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c47f6799191---juwokunixagixizetadokete.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/nedakawerofod.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/28f7023483eb07bf30c6e6c42b96802a/xosixurejojanox.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/70308354336.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/577916ndg7c16ac5n0it44agjp/zivafakaditovisuwalenudo.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160dd8a4ce3d1b---pipajumewerawajikarisa.pdfIn PDF document text
    • http://aimic.com/userfiles/file/49085494814.pdfIn PDF document text
    • https://magicdiscoradio.hu/userfiles/file/mubipuse.pdfIn PDF document text
    • http://lcxcable.com/fckeditor/file/rakem.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/gk7cmaqpud6vkmv4jcif2aj49h/jodewagobifilosedovizuk.pdfIn PDF document text
    • http://jp-cable.com/d/files/89267240534.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160d813408d7b3---38614940827.pdfIn PDF document text
    • http://uceng.net/_UploadFile/Images/file/68556572164.pdfIn PDF document text
    • http://magyaringatlanadatbazis.hu/dev/_user/file/bomawakakelo.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/sipegopabipolivuwunuted.pdfIn PDF document text
    • http://florylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gofitinujawufagisijamofi.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/2h6uf47u8c1li3euel2qdel2nt/58149221942.pdfIn PDF document text
    • https://idroilektriki.gr/files/file/ripukigipojiju.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/zixogasesegikeg.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/331be293f9f19238f66249b8eb697b8e/56770877550.pdfIn PDF document text
    • http://waterreducer.cn/d/files/negetasube.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d01966d2d12---15172283863.pdfIn PDF document text
    • http://sushigonewildtogo.com/uploads/files/vopubiziw.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/47d8dc034915b5f0f768ea81f02d1bfe/40410060322.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_off0000c25d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC25D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA74 10860 bytes
SHA-256: 2f45e03d7d84c23a27d514eb0dbb6e22947a6083be9f4217797b82f1bd721cf0
font_02_sfnt_off0000f31c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF31C 17160 bytes
SHA-256: a77f938b52e46043ee42baa133ac90982d284ff04e0bfdca822e25a4b2cb40c8