Malicious PDF — malware analysis report

Static analysis result for SHA-256 c75e5839c5617c96…

MALICIOUS

PDF

95.1 KB Created: 2021-09-20 08:58:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: fb02dfd89f52e8f4c0d7f1750f8251ac SHA-1: 77b056811a476cd2b1dbe6cbe85600a88ce9b41c SHA-256: c75e5839c5617c96f97162275d7dd4b08e8dfd829bba3c9f94f8621bf0f95223
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious. It contains a link farm pointing to compromised WordPress uploads and other disposable hosting, suggesting an attempt to distribute malicious content or conduct phishing. The presence of numerous external URIs and the ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://www.igescanada.com/ckfinder/userfiles/files/93645818946.pdf In PDF document text
    • http://acril.ru/ufiles/files/xegaxerijerolasagonu.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/83239444697.pdfIn PDF document text
    • http://ambulatorioveterinarioilprato.eu/userfiles/files/zufekadonipam.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/202191822434661.pdfIn PDF document text
    • https://bestcaps99.com/ckfinder/userfiles/files/poterub.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613a91ccb33aa---xowekavinif.pdfIn PDF document text
    • https://cfaegaianascente.pt/portal/userfiles/files/foxeluwawolemopafipom.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/e8812297aaf8514231e5c57421b4257b/zikadilomavoroveloziro.pdfIn PDF document text
    • https://superpart.com/files/66035009241.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/b7387cb58f571c7f9518e50ff7740dad/mowewadanisepexofaku.pdfIn PDF document text
    • https://posetili.ru/userfiles/file/72288817501.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/lutanituzonusenumuvotala.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/bibega.pdfIn PDF document text
    • https://byocamacho.com/ckfinder/userfiles/files/98839552379.pdfIn PDF document text
    • http://www.serenissimaservizi.com/files/60020234814.pdfIn PDF document text
    • http://lingvastar.z-i-g-z-a-g.com/userfiles/files/7594141350.pdfIn PDF document text
    • http://biancoacolori.it/userfiles/files/jebisoridemesolomab.pdfIn PDF document text
    • http://swvocal.com/data/se2/file/rapibevabapitesafixiso.pdfIn PDF document text
    • http://aotwresort.org/ckfinder/userfiles/files/ribuferulanugopamim.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/gajidifaxabibesonibedok.pdfIn PDF document text
    • http://es-hanasaki.com/yamituki-n/uploads/files/vegixamerusuzit.pdfIn PDF document text
    • https://transilvaniafishing.ro/app/webroot/files/userfiles/files/81822329084.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140edd2d831e---zazolonufituwagipatavugal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=wonder+woman+free+moviePDF link annotation
    • https://lapdonline.org/file/lonuj.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_off00010dbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DBF 18964 bytes
SHA-256: dc20e3408ffb8780de3bc456413356ffc79e5af2300e595dc872cbff671bdc3c
font_01_sfnt_off00013f32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015749.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15749 10348 bytes
SHA-256: 8273304a1b1034f11e7cd18e7144d4e89d368a62b8b5ed63cafacd1ded399b44

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