Malicious PDF — malware analysis report

Static analysis result for SHA-256 b79e93b14cf4223c…

MALICIOUS

PDF

76.9 KB Created: 2021-09-04 21:15:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e9dbb87b58aba59c8ce200b742bb0640 SHA-1: 1c4ef6ec9997f01209c9289a52a0460cdfc2ecec SHA-256: b79e93b14cf4223c8376b96dd6518f59810e8a3a48679f096ea550134866dbda
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious or phishing content. No scripts were extracted, but the overall structure and URL distribution strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://ketchas.ru/uplcv?utm_term=convert+html+to+pdf+using+pdfbox PDF link annotation
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16074b6ff40886---55274053343.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a5dbf25c689---73544213884.pdfIn PDF document text
    • https://www.q-jin.ne.jp/ckfinder/userfiles/files/kipir.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/16091da756d70f---fabes.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a55a88d38ad---76572500581.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/53595920140.pdfIn PDF document text
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/kiverijikoxenalol.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/ridotip.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f9526c574---korezofazam.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610a059a7f6c0---kajatezepan.pdfIn PDF document text
    • http://yongqingtech.com/d/files/vikisapomixijas.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/4805de57c67aafc12a898fb2627f492c/96322748247.pdfIn PDF document text
    • http://hpworld.hu/data/pic/Image/file/55904507294.pdfIn PDF document text
    • http://banlinhkienlaptop.com/userfiles/file/40644779146.pdfIn PDF document text
    • http://sntaviator.ru/ckfinder/userfiles/files/vuropanuwabujudotozuxuxi.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c29f794e623---kumolugotup.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160760592b64d9---govukifoxapawa.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607b5704af846---tiburelidufamenusid.pdfIn PDF document text
    • https://petek.biz/resimler/files/93338151202.pdfIn PDF document text
    • http://dentalcenterstudio.it/userfiles/files/22873478555.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/905b7d2f84a9cd451205a5137bdf4f91/razabisajexamugeguserifun.pdfIn PDF document text
    • http://www.dkmodels.net/ckfinder/userfiles/files/kerefogezevifitologiwo.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609630ea397dd---wavogino.pdfIn PDF document text
    • http://shssailors1969.com/clients/3/36/366f78b21138e0f8005dfe6cc5e09e30/File/dakubepodonoputokuzotikes.pdfIn PDF document text
    • http://www.climatisur.com/ckfinder/userfiles/files/1678285180.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_off0000c75f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC75F 11220 bytes
SHA-256: dd47ac247134be0f4559e780b3e9d53536eba82e261c710b1a07692fba1c4983
font_01_sfnt_off0000e10b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE10B 17256 bytes
SHA-256: 2d647218ab4789a6efd6a383f89d1009ed2c3772abb643bad7f58202d640a750
font_02_sfnt_off00010deb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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