Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d169314f8d96f7c…

MALICIOUS

PDF

74.5 KB Created: 2021-09-19 22:16:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 38118023f3c17120534526907b460668 SHA-1: 86620a4c77bc62ffb443543a01199e7fefa1dd29 SHA-256: 1d169314f8d96f7c59b5500b0e7933a37d11a6bc6229b63c64ee4fc6c79defff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm with numerous URLs, several of which point to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The presence of multiple links on disposable hosting and the use of UTM parameters suggest SEO manipulation for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://gestionarival.com/userfiles/file/jowetuduxazalabibe.pdf In PDF document text
    • https://weilaimachinery.com/userfiles/files/59108051133.pdfIn PDF document text
    • http://carmakers.cz/userfiles/files/wusafuwu.pdfIn PDF document text
    • https://xyoaa.org/sites/default/files/files/79655775314.pdfIn PDF document text
    • http://top-rubber.com/admin/fckeditor/editor/filemanager/connectors/upload/file/72912201731.pdfIn PDF document text
    • https://ural-aiti.ru/admin/ckfinder/userfiles/files/38582009332.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/161451ac2a9cba---2240109820.pdfIn PDF document text
    • http://em-mould.com/ckfinder/userfiles/files/64132724133.pdfIn PDF document text
    • http://strandedtattoo.net/file/gujexivotuduvewiwu.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/18704993818.pdfIn PDF document text
    • http://jiangsutravel.kr/userfiles/files/20210915_155542.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///fuzojipamowagavolufavuwe.pdfIn PDF document text
    • http://oawebserver.com/piceditor/file/35978674168.pdfIn PDF document text
    • http://addisonplaza.abwingsmd.com/uploads/files/34391086820.pdfIn PDF document text
    • https://emailing-online.fr/uploads/userfiles/file/gidovebisaxux.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/6033693fe9c16c69d1e6a4e8e9872e32/78240823570.pdfIn PDF document text
    • http://cancunday.com/travela/img/files/45041078734.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16139bfaf02c3f---gabevukolonidajojaxuj.pdfIn PDF document text
    • https://baust.edu.bd/app/webroot/ckfinder/userfiles/files/miwusapat.pdfIn PDF document text
    • http://danies.ru/ckfinder/userfiles/files/ratosozibalusaju.pdfIn PDF document text
    • https://fallahi-sch.com/userfiles/file/43581777955.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=online+games+bottle+flipPDF 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_off0000c276.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC276 16224 bytes
SHA-256: 0fa03854d12476dc5c2a289fc3a40862637966a1d1d154ec46a5df589dea5385
font_01_sfnt_off0000ec11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC11 10768 bytes
SHA-256: 81c7d6cde9b4c2f10db1a11353636a0b1c08916f14f7552c70f05082f025c29c
font_02_sfnt_off000104af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1