Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff12554383459d8d…

MALICIOUS

PDF

97.4 KB Created: 2021-07-25 15:41:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4a539d71b22d4426b1ccd8261a04ed71 SHA-1: 14accb0f4d1177189e9567c3ff7b1c7073967166 SHA-256: ff12554383459d8dd478ef41027fed5be02d142d30a41ad317e74b7def28944e
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. The file's structure and the presence of multiple external URIs, including those on compromised CMS uploads, support the classification as a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/0e4f01b2730359c1f22b7c560522b5fc/memivaxoposudemotojixuwi.pdf In PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a77eeaa09a7---39082216346.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/89b5a3a12fcba217b9deed104778b098/10925539481.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/nc8pik5mud77eh5u5elpkira50/80009348083.pdfIn PDF document text
    • http://omatsuri.kr/data/userfiles/files/vusarosulezepifapanubutow.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/dakurovedepoj.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/5cdc9ec6fee9c6f2b1008c944e95cdf2/48701044940.pdfIn PDF document text
    • http://energo-winstal.pl/userfiles/file/fifudefoz.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/70340314155.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e71d3eb56---78002953304.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070ce608694e---didemogezufilemubofirukug.pdfIn PDF document text
    • https://tavio.ru/files/file/66168953654.pdfIn PDF document text
    • https://guclupin.com/calisma2/files/uploads/tefuw.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7384360fb1---tidemotalomadufum.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/8385164662.pdfIn PDF document text
    • http://christopherspubandgrille.com/userfiles/files/miluzapumuzitabuf.pdfIn PDF document text
    • http://wadirumshootingstars.com/userfiles/file///78660793757.pdfIn PDF document text
    • https://digireg.pl/upload/lepogudiwapigefozuwuj.pdfIn PDF document text
    • http://linpus.com/app/webroot/userfiles/files/73226964345.pdfIn PDF document text
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/xojazumazalare.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/80726667755.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/zomolojedawexewogawukux.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/524eda9f47c7041766409c7570e3b9f4/26145973976.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/5528f34970d0435759396b6de82d1671/18314421571.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=ejemplos+de+formulas+estructurales+de+compuestos+organicosPDF 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_off000116e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116E8 11176 bytes
SHA-256: aea44786c4dd3d09748ca63d8d1ea6879ab0c8b8f430ca8d2935c7c06f7d759f
font_01_sfnt_off000130c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130C6 17576 bytes
SHA-256: dcccc8fc5f304425c990819648e823f9e56d745406b30d00f9d8ca131023d7ad
font_02_sfnt_off00015cfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1