Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bebf19c1bf3aa11…

MALICIOUS

PDF

73.3 KB Created: 2021-09-07 20:25:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4af28c13b97230b1420b9e116f8f09ed SHA-1: 20f7f3e173022b643549bae15d3377c4c197bfd0 SHA-256: 9bebf19c1bf3aa1151b864a6ff7f329e7f2a38c3b52d97d79bfc82de1a8cee42
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm or redirection mechanism. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports the malicious intent of directing users to potentially harmful content. No scripts were extracted, but the overall structure points to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://temahr.hr/files/nevuxe.pdf In PDF document text
    • https://noddy.nu/images/file/sakira.pdfIn PDF document text
    • https://lawyerupsmart.com/tempimg/file/35784001030.pdfIn PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/81011697652.pdfIn PDF document text
    • http://steelfurniturecn.com/d/files/12123433192.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae737f45803---16370500048.pdfIn PDF document text
    • https://shopexpert.com/app/webroot/files/userfiles/files/38599113465.pdfIn PDF document text
    • https://vozilasavozacem.rs//files/worubavivawefukug.pdfIn PDF document text
    • https://steammining.com/userfiles/file/99371070555.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/4d506bfbcf1af732843b8f4ca4fea412/fonesidexubadukonikuwo.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/1fk5iebkj4t9gts0r8o8qnt3hm/wivebafibezitabe.pdfIn PDF document text
    • https://incoyun.com/calisma2/files/uploads/zalibomixakulawafiloveba.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8ba6685f9---81873712019.pdfIn PDF document text
    • https://tasteadmin.com/ckfinder/core/connector/php/custom/wysi_uploads/files/85927601150.pdfIn PDF document text
    • http://xn--oy2b19v1mb1yi.com/userfiles/file/xevajagipofimemo.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/duxivujibuxavozadilan.pdfIn PDF document text
    • http://sanyosushiglendora.com/uploads/files/66713150360.pdfIn PDF document text
    • http://www.siscbolivia.com/admin/uploaded/fck/file/2971788357.pdfIn PDF document text
    • http://wenxuezj.com/images/File/tokipivubutipofikijedis.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/sezivizimanefelukaxivupar.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/90330673983.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/benaxogibodugixotokurasam.pdfIn PDF document text
    • http://growlink.biz/userfiles/file/38033194751.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/63391410194.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/vvot1ffddkuolfuig6mrhsaqsv/sokud.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/16077ddb902ed0---sekevekemenevikeniluduvul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=grade+1+math+textbook+pdf+philippinesPDF 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_off0000bbd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBD0 16176 bytes
SHA-256: b5180ae50407a97459c5988e37234390de8ca973b2f13f910d6f9252b76db523
font_01_sfnt_off0000e54c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE54C 11188 bytes
SHA-256: d28c3d9e47f96d39fc95e63e727f06dbefcb233bf5d273901d9c644c31acdf91
font_02_sfnt_off0000ff20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.