Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebb15a87c136ecab…

MALICIOUS

PDF

81.5 KB Created: 2021-09-17 21:53:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dfea71e6078e8703c36055593f1fb04f SHA-1: e232fb69d0b15cea3f665cfd53fd7e63426149a9 SHA-256: ebb15a87c136ecab8484106aca54d2ee4ee27d765b910a2062b6262e1cb1963e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://szsahsh.com/uploads/files/16090963046.pdf In PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/b2b9622754b8fa88bb9ad6a32b33a0b9/deraxofesosowizewo.pdfIn PDF document text
    • https://thehouseproduction.net/file/demetufasapumaluzedabamo.pdfIn PDF document text
    • https://tourgardan.com/basefile/tourgardancom/files/pimosutano.pdfIn PDF document text
    • https://pgp-puh.hr/fck_media/file/tufozutidem.pdfIn PDF document text
    • http://ghettaetamionarchitetti.it/userfiles/files/nogevejisutalikapam.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/55de1d2aae33eb462f698f2ed10ef2fe/49623627827.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161379bfae6aa5---56444932002.pdfIn PDF document text
    • https://wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/75097888738.pdfIn PDF document text
    • http://ever0036.com/assets/uploads/ckedit/files/20210905153015.pdfIn PDF document text
    • http://jeanthompson.nl/ckfinder/userfiles/files/43862009980.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d99c70bf81---78736824326.pdfIn PDF document text
    • http://tulga.ru/editor/files/72853584183.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/57457818942.pdfIn PDF document text
    • http://daindnc.com/fckeditor/userfiles/file/rojedaxesugiluj.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141c7d53dbcb---gajosijeburigagojebujux.pdfIn PDF document text
    • http://thietbimaugiao.vn/Images_upload/files/8822762297.pdfIn PDF document text
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/jajizugijanopopepalewagaf.pdfIn PDF document text
    • http://marleenjansen.nl/images/uploadfiles/duwugitovagazokalu.pdfIn PDF document text
    • https://cornwallstaffagency.com/userfiles/file/zimukopofuxuxusuwis.pdfIn PDF document text
    • http://eyupsifalibitkiler.com/resimler/files/91947243618.pdfIn PDF document text
    • https://dolupin.com/calisma2/files/uploads/tovubidadite.pdfIn PDF document text
    • http://artiguardia.pl/userfiles/file/45116650988.pdfIn PDF document text
    • http://nutranghongngoc.com/media/ftp/file/32435292127.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=most+recent+kodi+buildPDF 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_off0000d8e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E3 10528 bytes
SHA-256: c1c4c7b18c277c86ab5e64304d977d6d5ae7f85a2fc4d5185860a3e05c1d8602
font_01_sfnt_off0000f0fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FC 18476 bytes
SHA-256: 6a1326bac1279e344b29c26c73f7d0c815e0e783e440f78e5c734912bbc3c125
font_02_sfnt_off0001208e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1208E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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