Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef82ed33ab6c0e7f…

MALICIOUS

PDF

75.4 KB Created: 2021-09-02 13:33:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b1952bd5e2076744d9d083ae68ef78b9 SHA-1: 49153e9862b7111a53472086c93f0d11ee866277 SHA-256: ef82ed33ab6c0e7f70ff1051057275597d2be350ffa9de2c5c08eaf44ec92622
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting. These links likely serve as redirects to phishing pages or malware download sites, indicating a probable spearphishing attachment vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1c7db41f9---ragejuva.pdf In PDF document text
    • http://manleyboone.com/clients/3/3d/3dd19be848c73b0ce3a0430f7fd535f3/File/21606827585.pdfIn PDF document text
    • https://zilalcooling.com/other_files/File/18863418401.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/622obh9m5g8drtstb3j7b777tv/tuwakelifijikumorukex.pdfIn PDF document text
    • http://ashioke.com/images/library/File/10687256901.pdfIn PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/kugemapod.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/d60da74c5dc38a56beb7d3e0c38d7efe/48562269320.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec7a69d2e5---xanilezevapef.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/629397b1b617c9921fa3b3b1b38570ea/22974675406.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/4f873b47481f77f4e86da184726a1b8b/16504148748.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16114a6b8dd069---32039543263.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609226419120f---dozipizilajovowepadegov.pdfIn PDF document text
    • http://chinalabware.net/d/files/83600285023.pdfIn PDF document text
    • http://olympusflights.com/files/files/gofeziwezasarofotexovib.pdfIn PDF document text
    • http://mrsinternationalbeautypageant.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/rigenatiforemojifubo.pdfIn PDF document text
    • https://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/cnvb6lel9t91aaj2n0na0nvct6/zalelevodezivi.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/42438487916.pdfIn PDF document text
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/94532238261.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/f9e640a3538ea5fee143e66e8e260b7b/devesufosivo.pdfIn PDF document text
    • http://eortak.com/img/fck_temp/file/25093107089.pdfIn PDF document text
    • http://www.lebedosapartotel.com/data/yukle/files/fusadexodotamoxi.pdfIn PDF document text
    • http://haphadoor.com/upload/files/zamejadenuzira.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f70d02e672---71840489494.pdfIn PDF document text
    • https://djennebeads.com/nbloom/fckuploads/file/1042546112.pdfIn PDF document text
    • https://fl-forever.com/upfiles/editor/files/dakebenumori.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=entrepreneurial+motivation+theories+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_off0000c41c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC41C 10912 bytes
SHA-256: 012e9bcc39ffa85e459e4ea9bf7ff95c89dee773965692e9799e005b15b5cac9
font_01_sfnt_off0000dd1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD1F 16616 bytes
SHA-256: 9f1749fce24c386b27e09837174266c60bf24ddaf61fa1c44d95b073b5b49bf2
font_02_sfnt_off000107d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1