Malicious PDF — malware analysis report

Static analysis result for SHA-256 f15ddb7202db37b3…

MALICIOUS

PDF

84.5 KB Created: 2021-09-06 08:25:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e165da389b4a3e1a04f8d2019700cafc SHA-1: 9878a756b6490a3c4ad9d9f1e01400ac8628ead7 SHA-256: f15ddb7202db37b34e2c273ef5fcf90a2c19b49f052d78fbc2e8592dd20717de
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm with numerous embedded URLs, many pointing to compromised CMS upload storage or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure suggests the document's primary purpose is to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://grandplaza.bg/uploads/assets/file/90287919112.pdf In PDF document text
    • http://wshs67rocks.com/clients/9/94/942520bde836a0b401740df6f3d23d35/File/93104951034.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16088e885a09a5---zozufetononagi.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/80847352755.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16074d8ba855b0---dalebibexajamiv.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16078bc5ddc041---rosemolemuv.pdfIn PDF document text
    • https://tvmreza.tv/ckfinder/userfiles/files/bokeki.pdfIn PDF document text
    • http://dancephoto.ru/userfiles/files/dugiwa.pdfIn PDF document text
    • http://coumert.com/images/file/35493583098.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c92e82008---zupuj.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/ko07j22565s8j04hh7pg9k6bv1/43632038825.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///xiwujagulimunutoripaxisim.pdfIn PDF document text
    • https://dolmalatrek.com/userfiles/file/3900110119.pdfIn PDF document text
    • http://12shio5.com/contents//files/jaguxa.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/23898743ab46c65c71b36dad7d699fdf/pijanijumuzogegediget.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/dazalelimiloxajewezinap.pdfIn PDF document text
    • http://qataminational.com/uploaded_files/userfiles/files/dowigolakosalo.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/c2n854egn6u6hoe4fi36i3bkq1/23860178541.pdfIn PDF document text
    • http://thuaphatlailongthanh.com/upload/contentFile/minhchau/file/71880789741.pdfIn PDF document text
    • http://szhlfz.net/upload/laxomewiw.pdfIn PDF document text
    • http://csavarkompresszor.hu/userfiles/file/jedimar.pdfIn PDF document text
    • http://antichigelsi.it/userfiles/files/wanajevaroxojodeduwuzidig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=food+adjuncts+pdfPDF link annotation
    • https://www.posluh.hr/ckfinder/userfiles/files/83936087224.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_off0000e2ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2AB 19048 bytes
SHA-256: 466599dda6a96476668d3910c774c99fdb5b2dd28d7e0d50b0d935b2e3bd56e3
font_01_sfnt_off00011490.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11490 10452 bytes
SHA-256: 50e5f23ae0d3481f0bacb925959cd8ee5f6dc701d08d894bf649f85269a3ee89
font_02_sfnt_off00012c6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1