Malicious PDF — malware analysis report

Static analysis result for SHA-256 361342b3d7f35133…

MALICIOUS

PDF

89.1 KB Created: 2021-09-14 19:13:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 82bf4d1506179bd8f365580cba8a36b8 SHA-1: 576df6810897a16f51b7f7f828a01715119ad5fe SHA-256: 361342b3d7f3513347e6d1b9f5be9c6d6b07ffb9675484442562478ce60e9683
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites and disposable domains, suggesting an attempt to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://qnzar.com/files/mizineselarugusel.pdf In PDF document text
    • http://buydecor.ru/uploads/files/38507153305.pdfIn PDF document text
    • http://hoachathoanggia.com/userfiles/file/miranolonubof.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16140275ebd3fb---14997512194.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130f199bec75---mebinelulufokalawuruw.pdfIn PDF document text
    • https://zaragozadenoche.es/upload/files/4226955866.pdfIn PDF document text
    • http://geometrabottero.it/userfiles/files/fagipiwefefuki.pdfIn PDF document text
    • http://kcpsystem.com/userData/board/file/dunabaniba.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3f2f12be1---92561887410.pdfIn PDF document text
    • http://eros-arena.de/eros/userfiles/file/80183545516.pdfIn PDF document text
    • http://vanillasky-ch.com/images/files/loxegimirix.pdfIn PDF document text
    • http://kiajihlava.cz/UserFiles/File/pakagusefato.pdfIn PDF document text
    • http://owop.challengersports.com/ckfinder/userfiles/files/91174878252.pdfIn PDF document text
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/45728396720.pdfIn PDF document text
    • https://orangcar.com/app/webroot/upload/files/6828104093.pdfIn PDF document text
    • http://bharatdarshan.net/rgroup/ckfinder/userfiles/files/68353717249.pdfIn PDF document text
    • http://abnicum.ru/files/file/56047653441.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/migixipizawunotu.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b3f081e686---zomawujibulamisokasadiv.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/ed9ba06bca7b377b42f9043e52cb2d4d/vomuliresuxakojaz.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/22483552857.pdfIn PDF document text
    • https://jjpremiers.com/files/navirinudiw.pdfIn PDF document text
    • https://gujaratisamajparis.org/upload/files/rekagubigopugoba.pdfIn PDF document text
    • https://bwhe.in/ckfinder/userfiles/files/wagiwixefiwofanesivobaru.pdfIn PDF document text
    • https://ostrichpharmaceuticals.com/userfiles/file/94139949896.pdfIn PDF document text
    • https://itexpertdog.com/upload/files/zuxowonazuzupola.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=iron+man+mod+apkPDF 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_off0000f9be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BE 18072 bytes
SHA-256: 22d8e26cb33fdd772bb52bce9821b5a1cd618abffbb00371ced1fea53bfdf1c3
font_01_sfnt_off000128c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128C6 10060 bytes
SHA-256: c6d24db3fe17be34ea5834cef0fc130051438d3ae82ad10b18e63d01cfa1eeb6
font_02_sfnt_off00013f07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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