Malicious PDF — malware analysis report

Static analysis result for SHA-256 920d5cbcef8fe66a…

MALICIOUS

PDF

85.2 KB Created: 2021-10-08 18:04:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 5342d5fdc4f221d076b07f009791aef9 SHA-1: 982a71e57792a78f74da3bebd2c1d14214043d5e SHA-256: 920d5cbcef8fe66a675f8d2531ffb8c77d1d3ecf36dabdfba5f1a31732d6bd7e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and URL analysis suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://egokituz.eus/files/galeria/files/tezodanurele.pdf In PDF document text
    • https://partnyor.az/userfiles/file/64533202055.pdfIn PDF document text
    • https://deshpanday.com/ckfinder/userfiles/files/27579326575.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/16151f8c48477c---rekigegopi.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614755bba16cc---pibidakadigobu.pdfIn PDF document text
    • http://www.majbrno.cz/uploads/files/memesozuruzapepilepo.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16134b7502891a---rebate.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135a13e1ea96---zimofu.pdfIn PDF document text
    • https://miaousland.fr/ckfinder/userfiles/files/wudotusinesafemubu.pdfIn PDF document text
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/sefonekofodelob.pdfIn PDF document text
    • https://www.truck-transport.com/ckfinder/userfiles/files/nidutefudosub.pdfIn PDF document text
    • http://headlinesdinerla.com/uploads/files/sadegerenafobum.pdfIn PDF document text
    • http://chalappuram.com/userfiles/file/88994493001.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/161350ca82d4a8---21081928050.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/vukexod.pdfIn PDF document text
    • http://hanahana.vn/media/ftp/file/sunosufedapetutusadejiz.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141922789408---6728250953.pdfIn PDF document text
    • http://phonphangschool.com/upload/files/buxodokudo.pdfIn PDF document text
    • http://mocphatreal.com/assets/images/ckfinder/files/rerugodikufi.pdfIn PDF document text
    • https://maintogelonline.info/contents/files/56378324044.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/mabemikapagapelutupabep.pdfIn PDF document text
    • http://luxmeterthai.com/ckfinder/userfiles/files/gepegevujexujodawojitesuk.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/lakopugub.pdfIn PDF document text
    • http://traslochimontalto.it/userfiles/files/duxugosevisarewod.pdfIn PDF document text
    • https://sukhayurveda.in/userfiles/file/pozokaxovag.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/fakewam.pdfIn PDF document text
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/1892827801.pdfIn PDF document text
    • https://abouelhoulgroup.com/userfiles/files/rutegasoxalixumife.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=what+is+go+to+secret+conversation+on+messengerPDF 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_off0000e31d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE31D 18908 bytes
SHA-256: 5e0e0d720ef7837f9d3fe82ecfca43e35b2d6a19c8e95af1d48a2e7fb202f270
font_01_sfnt_off0001145d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1145D 10692 bytes
SHA-256: d01b56c5916bd013fadc30547eb3afa40858b1921f1d9b3b38035fbc4d7636de
font_02_sfnt_off00012cc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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