Malicious PDF — malware analysis report

Static analysis result for SHA-256 91bcf1221cfa4ad0…

MALICIOUS

PDF

73.7 KB Created: 2021-09-29 09:47:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 9fff279ec50fab7ade92eec85856be2d SHA-1: 8bb91f900b87d0f2759303e14bee7f4fbd6981b6 SHA-256: 91bcf1221cfa4ad03109b0434c80ea9d67587c8157d322ad29649028a9cd8f73
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are sufficient to infer a malicious link-farming and potential redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://queure.ru/uplcv?utm_term=ios+12+settings+apk PDF link annotation
    • http://mnogonomerov.ru/uploads/file/mofaxunurixegukogelugu.pdfIn PDF document text
    • https://on-the-markmarketing.onthemarkmarketing.com/userfiles/file/20454059105.pdfIn PDF document text
    • https://takipbizde.com/calisma2/files/uploads/55597443300.pdfIn PDF document text
    • https://intersat.lv/files/file/57231877963.pdfIn PDF document text
    • http://trans-serwis.com/userfiles/file/godevofibebixamaxib.pdfIn PDF document text
    • https://veaodaibrahma.com/uploads/image/files/samojizekimofirisofuja.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/ob5ug26lcep8gsnphrkp2uain0/48665696213.pdfIn PDF document text
    • https://wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/19241352321.pdfIn PDF document text
    • https://krusomying.com/data/file/63785361782.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/5dn2o2pesmn23pchp2nl6eemtq/78591402491.pdfIn PDF document text
    • http://vencedor.coop/images/admin/file/nimowufudusek.pdfIn PDF document text
    • https://stockbauer.hu/uploads/file/mamazufupiweke.pdfIn PDF document text
    • https://office-agglo-larochelle.fr/userfiles/file/35359241711.pdfIn PDF document text
    • http://dispensapertutti.com/userfiles/files/41297661976.pdfIn PDF document text
    • http://quesnelfoundation.ca/userfiles/file/mupasakikirirasazibitol.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614bd00321e45---36365950189.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/16148426799.pdfIn PDF document text
    • http://musicincw.com/fckeditor/userfiles/image/74970167110.pdfIn PDF document text
    • http://bridgestone-ice-cruiser-7000.ru/ckfinder/userfiles/files/27803008707.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136fa517b40f---64429446810.pdfIn PDF document text
    • https://4cmedica.com/ficheiros_upload/file/92276594004.pdfIn PDF document text
    • https://spandoekland.nl/userfiles/file/12202574993.pdfIn PDF document text
    • https://mlspoland.co/files/file/jogedolamuguze.pdfIn PDF document text
    • http://pierrevillers.fr/mairie_files/file/mekuzige.pdfIn PDF document text
    • https://pagodatalk.com/_UploadFile/Images/file/68310625128.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_off0000b6b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6B8 18972 bytes
SHA-256: 6f76e2168b6bd47a563b8752fb7d69d72f57d7a05d255561bc1bd67c574d8c67
font_01_sfnt_off0000e7a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A7 10496 bytes
SHA-256: 89ec7956bb5ab5656309e416809bdb8529110beb6e68a8afcde170771e49ae80
font_02_sfnt_off0000ffc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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