Malicious PDF — malware analysis report

Static analysis result for SHA-256 e380cbc8e908c337…

MALICIOUS

PDF

68.0 KB Created: 2021-09-27 07:01:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 20021692197f53c5b4706d9013eca172 SHA-1: 68fd92b947d7098d36211fe9074db45c294f62b3 SHA-256: e380cbc8e908c3376deb40e17df9a7a0ecd502a1151880541452c019a1338c95
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. Several heuristics identified the document as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs and the nature of the heuristics strongly suggest the document is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://irlanc.ru/uplcv?utm_term=the+walking+dead+yify
    • http://romovi.net/sgi_userfiles/userfiles/files/85091896154.pdf
    • http://termocity.by/pics/files/kewuzuzumasadojelap.pdf
    • http://www.halpellet.hu/userfiles/files/buwexo.pdf
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/34896151fc38b84696c5b846b8527753/nusofepeluxevefimiremebe.pdf
    • http://freeware-software-download.de/uploads/editor/file/68538316820.pdf
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614b2a356da21---66721997759.pdf
    • https://eyetracking.pl/userfiles/file/lebisavojifikidelinuzuf.pdf
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16133dcfda52fe---xozomaderejiwuk.pdf
    • http://riverside-plaza.com/upload/userfile/files/12425324773.pdf
    • https://grootformaatspandoeken.nl/userfiles/file/waturesoveropevizo.pdf
    • http://deforma.it/userfiles/files/95326561990.pdf
    • https://hongming-eco.com/userfiles/file/43560125584.pdf
    • http://immodraft.nrw/images/architekten_agentur_images_/file/41333470562.pdf
    • http://neapol-m.ru/usr/file/80314121985.pdf
    • http://bedrucken24.de/userfiles/file/fototoxox.pdf
    • http://synfarm.com/upload/files/84082766119.pdf
    • http://bckbytow.naszbip.pl/img/upload/files/39010431858.pdf
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ebbaa6dca8---98707355354.pdf
    • http://aven.su/userfiles/file/33907731221.pdf
    • http://miraesusan.com/ckupload/files/44064229248.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/8718ff7c1a3c3e34d2ce670f009fd5d4/nijezafo.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000af1d.bin
5f05056840d227010785b159abb9d7b325e456b3af1057e01c3e88aa688ec5c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAF1D 10400 bytes
font_01_sfnt_off0000c662.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC662 16792 bytes
font_02_sfnt_off0000de74.bin
919af93a102f826e88591d4509fed8cf03a8efcfb30c2b8e4ae51887216c95d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE74 14404 bytes

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