Malicious PDF — malware analysis report

Static analysis result for SHA-256 25a764e89b079eea…

MALICIOUS

PDF

76.0 KB Created: 2021-09-05 18:05:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6d81dd5c36f534cac95da598ba23f4a1 SHA-1: 3533e167e7136d9b125b77bdb649ea451b50e10d SHA-256: 25a764e89b079eeaaeccf554a9565abe7613ceba57800d0f1024c6a52e8a9fc5
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file exhibits characteristics of a phishing lure, employing a link farm strategy to redirect users to other PDF documents hosted on compromised websites. The presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics, along with a high ML_NYX_PDF_MALICIOUS score and ClamAV detection, strongly indicates malicious intent. The document's structure and embedded links suggest an attempt to distribute further malicious content or lead users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb2d1c5463---92098150313.pdf In PDF document text
    • https://namlongadc.com/uploads/news/files/13145311794.pdfIn PDF document text
    • http://ccsup.co.th/uploads/ckfinder/files/17467767028.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/39989513348.pdfIn PDF document text
    • http://hanasushimenifee.com/uploads/files/21330110112.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/sikowozobugapebidigu.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1609deeb404580---71271929228.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/feae47627ecea85ad6a720060d83b4a5/79775444170.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/bajekadikasisurap.pdfIn PDF document text
    • http://parejalecaros.com/adjunto/upload/fck/files/84369873430.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/c1c95e58c29de5609aa24216c6e215de/xodokozi.pdfIn PDF document text
    • https://tenutaedone.com/filesUploads/file/44607873277.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/fbc7186b76b07f82edfd47dc8c3f6cca/lovitagiwe.pdfIn PDF document text
    • http://kapalishakti.com/ckfinder/userfiles/files/patuxivadeperen.pdfIn PDF document text
    • https://kuepancong.com/contents//files/80025196647.pdfIn PDF document text
    • http://ambulatorioveterinarioscapindandrea.it/userfiles/files/91467413716.pdfIn PDF document text
    • https://stvorki.ru/files/file/nalofutoviforufepa.pdfIn PDF document text
    • http://thietbiantoanttk.com/uploads/files/mavojatuponosenif.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089521ce13a6---zufogido.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/26449938770.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa06929ea3---79952098114.pdfIn PDF document text
    • http://mecaniquekd.ca/upload/file/210747202.pdfIn PDF document text
    • http://ydtmuhendislik.com/ckfinder/userfiles/files/tenerit.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/kipapozujow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=reading+a+standard+ruler+worksheetPDF 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_off0000c38c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC38C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB9E 17900 bytes
SHA-256: b36a4bad506bd860f2126d00e837b0b15f6e0bcad14fb883cee5d61e5c004c0a
font_02_sfnt_off0001093a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1093A 10852 bytes
SHA-256: ea8d41bae8a31f749e592210510acc3624e1884d667556041cf7f3f14d0fc396

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