Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c2d75d85071d9cd…

MALICIOUS

PDF

220.2 KB Created: 2021-07-02 14:02:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 3b4ad1603555a270e229aa9bd9f4ba1c SHA-1: 317aad055c4c032b2f402d3ac1d2f22243e96a42 SHA-256: 5c2d75d85071d9cd026fb6825194cfbe2ff4935e19192a28e513498d954b1b5b
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm pointing to compromised WordPress upload directories, suggesting a phishing or malware distribution lure. The presence of external URIs and a link farm indicates an attempt to redirect the user to malicious content, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9852

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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.
  • 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://krisoc.ru/uplcv?utm_term=payroll+project+chapter+7+answers+2020 PDF link annotation
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8645065f6---jirudelekamizikajeni.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d3d7b261bb---jiwusumemixizuwaga.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160899cfadfb45---84077838829.pdfIn PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/dofoxi.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/49762583553.pdfIn PDF document text
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/sazavufuwo.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608332becb98b---56697710546.pdfIn PDF document text
    • https://hfdjet.com/wp-content/plugins/super-forms/uploads/php/files/66234e24d5f576bf73fd2e4e5934d62c/2903633710.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/f1277965e34fff7986a71b0f505d5891/tanejaposevaravakusojuli.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/672a8012a31020bca9de0e2a8cb7962b/73751024865.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/e27e2511d07c7e1899866cebf86b1680/bakepaxidonumodotas.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/7343180001.pdfIn PDF document text
    • http://dnepropress.net/files/file/giwavusixegufad.pdfIn PDF document text
    • http://pleasanthillpchurch.com/clients/5/55/55aa087cacc886b2254ddcc242c0699b/File/39414485088.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/kufawukuxo.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f14597759---muratotanu.pdfIn PDF document text
    • http://westtech1963.com/clients/d/d4/d4250bc21dcbbf02d7f9bc68df143add/File/50163378223.pdfIn PDF document text
    • https://responsible-tourism-alliance.com/content_file/files/74624700797.pdfIn PDF document text
    • http://hpworld.hu/data/pic/Image/file/kujidebimisite.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098b17bb1024---63791670979.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/c700a195f7a0f10d24161ae18d78bc36/73068442535.pdfIn PDF document text
    • https://vinacomvietnam.vn/uploads/news_file/zojima.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/cb0218712000c6016281d3cde9c24825/42705139080.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8b92b8d8e9---zatukobaresodolabepep.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/0ttn7ajum5v1p5p961aad928kg/ziluxiwedexoworapipoz.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_off0002fc18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FC18 19968 bytes
SHA-256: ef88b981351fdbdb382d1cf132af1484ecc735f7c833c8a014481166699a43a9
font_01_sfnt_off000330c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x330C4 11004 bytes
SHA-256: 902353094f77940ebf73fae69881fa958380b9a08dbe0c2726df2d41916cf80c
font_02_sfnt_off00034a84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x34A84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1