Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0339c89e752bc4d…

MALICIOUS

PDF

85.8 KB Created: 2021-09-02 17:26:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c02a13d808d62d78343d4eb4b3c9d5b7 SHA-1: 63f3a7d19181ebaa1d0c90d8fe1b4497dcb6f84b SHA-256: c0339c89e752bc4d8e227a42557fee2c67919bc706b0c0692199a497e28898b0
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting. The primary purpose appears to be directing users to external, potentially malicious content, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://nomylo.ru/uplcv?utm_term=the+iraq+war+strategy+tactics+and+military+lessons+pdf PDF link annotation
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/8779708dfbe51df837493d54db8c46ae/birukununawenusudakux.pdfIn PDF document text
    • https://gamaconsultores.cl/upload/file/kijunegevasepomatajinemu.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078e6d5605e3---47927494309.pdfIn PDF document text
    • http://shippingengineering.com/files/ckeditorothers/61034786134.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/61fc59c979b1bc2483cda14864217a5f/75802913779.pdfIn PDF document text
    • http://vieclamtaichinh68.com/upload/files/vafimigutononop.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/35410281374.pdfIn PDF document text
    • http://chengzechem.com/upload/files/vesitoluvavazojilebepuf.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/3f5b4d4a41d2638762d762f8643242c2/jenefoxasataxigulajobu.pdfIn PDF document text
    • http://tc-antey.ru/uploads/files/75048809251.pdfIn PDF document text
    • https://www.stjohnhomelessshelter.org/wp-content/plugins/super-forms/uploads/php/files/eb95b8e773df92cabcec5724aeaaaea5/46916394147.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/97700766110.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-3/20210503135359281418.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/87260946009.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/jozupegozonakovirosikaj.pdfIn PDF document text
    • http://ttmplus.com/userfiles/files/36702557675.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/namhi80d4k1pcghjrce4lvv0l5/vuzax.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160748e85585d0---kegefitepunalago.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/57639925146.pdfIn PDF document text
    • http://phuongdonggolf.vn/app/webroot/uploads/files/xejuvubuxewalusujujasagu.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160918f5065227---47387323275.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/39318074789.pdfIn PDF document text
    • http://fairview68.org/clients/c/ca/ca24e3df3ff7fa9b839de6c08aba9959/File/67370574064.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/f7b760c4c7beabd7a77b7e20a697639a/wevorasosed.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a67895b362d---fonatutunenogiz.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_off0000e7d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ffe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE2 17940 bytes
SHA-256: ff539d42c4121764e174bf81b9cddd0428410e368d6cf975e2b512b63598ebde
font_02_sfnt_off00012ec0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EC0 11376 bytes
SHA-256: bfa5f9cbf9ef596d969217a7de8cbc065a0d65134adff995e5d25acdcd4a3b63