Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b781b5791c5e035…

MALICIOUS

PDF

80.4 KB Created: 2021-08-24 06:44:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b0af2814c5f520f018f9e91db576b346 SHA-1: 9a41248a04a114d337f08a5b9c7bfa6d3c67259c SHA-256: 8b781b5791c5e0351a57cddab2753eaf98817faeb80606ff4b4a23b1c7370af0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links pointing to various websites, many of which appear to be compromised CMS uploads. The presence of a link farm on disposable hosting suggests an attempt to obscure the true destination or purpose, likely to trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607d63c1d8f66---vesapopitovusuveji.pdf In PDF document text
    • http://cloverpark1959.com/clients/51168/File/dokisagiwizuriletudimeve.pdfIn PDF document text
    • http://www.jokilaaksonratsastajat.fi/file/gogorufabovig.pdfIn PDF document text
    • https://zzhqhi.com/d/files/52789181638.pdfIn PDF document text
    • https://stop-remont.ru/ckfinder/userfiles/files/duxipojijakaletabofulemaf.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/63003195670.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/faxamagalixalage.pdfIn PDF document text
    • https://semangkabiji.com/contents//files/59099394792.pdfIn PDF document text
    • http://quick-thailand.com/images/uploads/file/73515829083.pdfIn PDF document text
    • http://chinajessie.com/seadata/data/uploads/img/file/162497052376.pdfIn PDF document text
    • http://stagelight.pl/userfiles/files/mazudixuwevegovafadosew.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd48dcde30---fonoge.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/jukux.pdfIn PDF document text
    • http://mistralizmiryonetim.com/uploads/file/xudotixofikirigoxuru.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/zosomozipavanijuto.pdfIn PDF document text
    • http://helloshoppingnepal.com/userfiles/file/41608308294.pdfIn PDF document text
    • https://aprenda-atdi.com/uploads/files/duvebopupopoxudufisamoxo.pdfIn PDF document text
    • http://davidlbrooks.com/clients/868292/File/kikufuwepeduforujifaxubox.pdfIn PDF document text
    • http://saeronbio.com/userData/board/file/mutalomasepulovar.pdfIn PDF document text
    • https://abyway.lv/images/ck_images/files/70771183821.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609551cfc39f8---48239351133.pdfIn PDF document text
    • https://faprosid.com/file/fivazerefutexux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=abdominal+muscles+feel+tightPDF 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_off0000d6db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6DB 17132 bytes
SHA-256: 70c55b6c6ece0d38470890ee2d34828a73250c4dc8849813166e432bdc65a962
font_01_sfnt_off00010315.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10315 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B2C 11044 bytes
SHA-256: c91a736dae8b339399d01f809f2855dc1f4ca0c754edc909147753bc41bb0d74