Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f589409727ab0e3…

MALICIOUS

PDF

77.2 KB Created: 2021-10-10 09:00:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 2d681bc133fa20060a152602d141f978 SHA-1: 1c4e4f1dfa4f14adf9c250b25b7e2e6e058d2d8e SHA-256: 8f589409727ab0e3a015cc210ac150e9b51039e6c53e1fb76d01c1c72d7910ca
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs and link farm heuristics indicate an attempt to redirect users to potentially malicious sites. The document's structure suggests it is designed to host a collection of links, likely for phishing or malware distribution, rather than displaying readable content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://drafthe.ru/uplcv?utm_term=how+to+convert+a+mixed+fraction+into+a+proper+fraction PDF link annotation
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/23bd8bd21b0456063f2c5c98fa5956a2/34170377343.pdfIn PDF document text
    • http://taaltoetsvo.nl/userfiles/file/famefusilozaviz.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/161462ada68076---33172331368.pdfIn PDF document text
    • http://lynxauto.ru/userfiles/file/74451586004.pdfIn PDF document text
    • http://daotaonhaccong.com/uploads/userfiles/file/dejimeza.pdfIn PDF document text
    • https://marblobaths.com/app/webroot/img/files/didajufimejuvimolap.pdfIn PDF document text
    • http://klm-co.ru/foto/ck/files/rosipizaxixolonolevolu.pdfIn PDF document text
    • http://sergeisurzhin.ru/ckfinder/userfiles/files/mogaxudizarusidesobutumis.pdfIn PDF document text
    • http://cdn.eagle.mn/uploads/userfiles/files/58571096169.pdfIn PDF document text
    • https://happy-playground.gr/uploads/_uploads/files/ravanerujabagor.pdfIn PDF document text
    • https://mallarpurnaisuva.org/go/file/48125952922.pdfIn PDF document text
    • https://northwestconvention.cz/data/files/kojugaditemag.pdfIn PDF document text
    • http://squash-fitness.cz/userfiles/file/zepekuvuxexaluzarijowugi.pdfIn PDF document text
    • http://smalternatywa.pl/media/upload/files/c6c4b7a853abe2937359b89e5662653e.pdfIn PDF document text
    • http://immobilieninvestors.com/userfiles/file/99071685463.pdfIn PDF document text
    • http://pes.edu.mn/ckfinder/userfiles/files/45682072881.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/161366952216e8---dopadikegananaroj.pdfIn PDF document text
    • http://pilot-market.ru/new/files/file/tofivetoxuxasuwa.pdfIn PDF document text
    • https://pulsekb.ru/admin/ckfinder/userfiles/files/goluzetazozo.pdfIn PDF document text
    • http://champagne-marc-chauvet.com/images/files/88968363130.pdfIn PDF document text
    • https://feldmann-spedition.de/pics/userfiles/file/32736187804.pdfIn PDF document text
    • http://mcap.cz/images/uploadedimages/file/63154807524.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_off0000c7bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7BF 10812 bytes
SHA-256: 47af761f555f33743fd4171ecacc90edccf94a287bec98b45448442204ba53e5
font_01_sfnt_off0000e0ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0AE 17876 bytes
SHA-256: f174895a9db993115f3fe1e925ad3fa898b37b2a2f6406abdc4d8a397cf4ba4f
font_02_sfnt_off00010ea8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1