Malicious PDF — malware analysis report

Static analysis result for SHA-256 17af23969d2a992f…

MALICIOUS

PDF

99.1 KB Created: 2021-08-03 16:47:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5d77e1ef337a66bebde9c5d33a294707 SHA-1: 87dc0b8371bdb6ccd6a5c5a3723ae94ce4c785d8 SHA-256: 17af23969d2a992f50352a31a897170d8774e27de010e53064a54bb475c4f98a
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, indicating a link farm designed to manipulate search results or host malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, suggesting the document's primary purpose is to direct users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9889

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 http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e40efeabf75---77240104177.pdf In PDF document text
    • https://netshopnepal.com/userfiles/file/betiwibakulogavijeg.pdfIn PDF document text
    • https://patriciobanados.cl/upload/file/In PDF document text
    • https://skinrepublic.vn/webroot/img/files/dufosebemegipof.pdfIn PDF document text
    • http://vodnik48.ru/content/file/padata.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f70a1b781b---lagexinij.pdfIn PDF document text
    • http://thaihotelsale.com/FileData/ckfinder/files/20210611_DB8B3CA29E112B4F.pdfIn PDF document text
    • http://korsorlampang.net/user_img/files/84145640576.pdfIn PDF document text
    • http://platypusspot.org/uploads/ckfinder/userfiles/files/17399201593.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/89f5bccec911184512de7ec431275c1d/24237228135.pdfIn PDF document text
    • https://olterus.com/contents//files/74796913352.pdfIn PDF document text
    • http://anma.pl/anma_edytor/file/datilapefugukipa.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/degizokitixekufubot.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/5122ebb012ce86baeb89855b48e583ea/20826291396.pdfIn PDF document text
    • https://tenfci.org/userfiles/file/liparaleved.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160988a795be4a---95671401922.pdfIn PDF document text
    • http://webinaris.biz/ckfinder/userfiles/publics/files/19248671733.pdfIn PDF document text
    • http://thetestmag.com/userfiles/files/40646784438.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/4888251366.pdfIn PDF document text
    • http://bobiniauto.com/userfiles/file/figunikew.pdfIn PDF document text
    • http://agriturismolataggiasca.eu/userfiles/files/41113290220.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a450cfd85b9---kebafu.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/jurimubiradefu.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/ik0g2ae76bu0eschgra3450q3h/40435311117.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/gufinewinije.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/87769371421.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=packaging+machine+design+handbook+pdfPDF 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_off00011b56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013368.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13368 18432 bytes
SHA-256: 63ad42a01924367c86de0e97533aaf880a51a205261d500c85b978f2fab3e1df
font_02_sfnt_off00016417.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16417 11056 bytes
SHA-256: 5fba41b8a9901409c015a79841f3f9a805778943b2457e1c9870404b26231056