Malicious PDF — malware analysis report

Static analysis result for SHA-256 162da5a2f69d2e2d…

MALICIOUS

PDF

69.0 KB Created: 2021-10-01 06:11:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: f032325bbbd4fe6b9012a51fd3b0392e SHA-1: 427e4a2d774056980c16465fdf3e585f5b3fe45f SHA-256: 162da5a2f69d2e2d9ece3df881f9021a36c168db82549e9ca5f4dbf03f0f47f6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated high maliciousness. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The presence of external URI heuristics and the ML classifier output strongly support a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://krisoc.ru/uplcv?utm_term=vidmate+apk+download+old+version+2017 PDF link annotation
    • https://menuiserie-sainte-anne.fr/userfiles/file/95019269948.pdfIn PDF document text
    • http://hb1004.com/userData/board/file/19058319325.pdfIn PDF document text
    • http://naphogacomposite.com/upload/files/gedotatumaxiwifawusu.pdfIn PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/56783742518.pdfIn PDF document text
    • http://tsraccountants.nl/mailing/images/photo/file/vepejidifakef.pdfIn PDF document text
    • https://castilloexterior.net/ckfinder/userfiles/files/zizafuvavifazu.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/2tkgp07tad0ne2fil4olpffmd3/37760797988.pdfIn PDF document text
    • http://ourpreferred.com/userfiles/files/rozizuzuk.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161417d60d7d34---60721991334.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/94669961646.pdfIn PDF document text
    • http://ridendo.cz/files/file/bitud.pdfIn PDF document text
    • http://thuocnam.xyz/images/files/22019329812.pdfIn PDF document text
    • http://misosmile.com/upload/editor/files/firexamifasipaxopelebeg.pdfIn PDF document text
    • http://thechitay.com/uploads/userfiles/file/mazim.pdfIn PDF document text
    • http://whatdwellswithin.com/file/janonitujuvuloposeko.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/317107aa266de65deb932ab5818b629d/nokoratogowiserego.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c297e70e47---75572434927.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7e9d124c5---wugawuw.pdfIn PDF document text
    • http://chengzechem.com/upload/files/jagaxada.pdfIn PDF document text
    • https://muguet.fr/sites/default/files/file/xajetugimev.pdfIn PDF document text
    • https://turismo-galicia.es/ckfinder/userfiles/files/xilobokiberova.pdfIn PDF document text
    • http://bienchidan.org/uploads/files/17024679622.pdfIn PDF document text
    • http://esipro.lu/userfiles/file/79088723803.pdfIn PDF document text
    • https://magiccat.pro/ckfinder/userfiles/files/75449134312.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_off0000af96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF96 14572 bytes
SHA-256: c9f756c94e1f41d724c0f773152caf079102ea47fe0ecca341a7324128f09b1e
font_01_sfnt_off0000d439.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD439 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC50 11112 bytes
SHA-256: 31127cfb53d70682e72304ab5c6c58944b94d926cde9a0264ddbe55444097eac

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