Malicious PDF — malware analysis report

Static analysis result for SHA-256 90654bcc9b9b3559…

MALICIOUS

PDF

75.0 KB Created: 2021-09-20 23:47:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d7133dd6439233ebf63d4d1657f11a9f SHA-1: eaa45aba30bb235e97869257ec22512f3b8d42e2 SHA-256: 90654bcc9b9b3559b34a8e342e17a99971f955ec262908d2824106dc3ebdda5f
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure indicate an attempt to exploit users through deceptive redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138d448c4633---sumumituvasizixuzapanuguv.pdf In PDF document text
    • http://bawaconstructions.com/editorData/file/75785941463.pdfIn PDF document text
    • http://photonart.nl/phpcmsys/file/68623224064.pdfIn PDF document text
    • http://infoguard.ru/content/file/zenefiwofikelibudupejup.pdfIn PDF document text
    • https://z87992961.com/upload/files/20210902210401.pdfIn PDF document text
    • https://scalper.ir/data/files/file/xikesobavugawalopetoxiku.pdfIn PDF document text
    • http://healingtown.org/userData/board/file/75324662689.pdfIn PDF document text
    • https://drakbera.com/ckeditor/ckfinder/userfiles/files/vilipipamazogijuteri.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/14955103005.pdfIn PDF document text
    • http://modernplating.com/userfiles/file/lekepipowukuvevotekexe.pdfIn PDF document text
    • https://alwaysthesame.pt/site/upload/file/686665558.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/179615ffb93adf852246840eb2470d65/biriruvededemeler.pdfIn PDF document text
    • http://sangjeom.com/userfiles/file///peposuvi.pdfIn PDF document text
    • http://er-trans.com/img/produkty/files/19718756357.pdfIn PDF document text
    • https://doublehair.center/upload/ckfinder/files/nipufanul.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/58502c236ec4bcfcbbb8d85a73197c93/rurudaxuxozejofagorimovoj.pdfIn PDF document text
    • https://snowcat.pl/admin/ckfinder/userfiles/files/20735290497.pdfIn PDF document text
    • http://eiffelflowersquesnel.com/userfiles/file/50613512149.pdfIn PDF document text
    • https://venefoil.com/ckfinder/userfiles/files/46626405170.pdfIn PDF document text
    • http://kingsfci.com/userfiles/file/49444709213.pdfIn PDF document text
    • http://videotour24.com/data/fckupload/file/24577844828.pdfIn PDF document text
    • https://silverstonedevelopments.com/ckfinder/userfiles/files/sawetulijo.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/file/mamudabo.pdfIn PDF document text
    • https://comfort8889.com/upload/files/xajopogudixawidugi.pdfIn PDF document text
    • http://tjchenxing.com/filespath/files/20210913235432.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=pokemon+sapphire+gba+romPDF 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_off0000c0f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0F4 10788 bytes
SHA-256: 991953335e44b6b4d984d295fcc538c8ca1bebf5fc261b49aec187c8f2ac3309
font_01_sfnt_off0000d95d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD95D 17340 bytes
SHA-256: e17e91d91b11a2bb82ef79eb855beb34e00872184d108484af419198e6b18c53
font_02_sfnt_off00010655.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10655 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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