Malicious PDF — malware analysis report

Static analysis result for SHA-256 bef6b99ba16325e1…

MALICIOUS

PDF

75.8 KB Created: 2021-09-20 05:49:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9a5ecb54d209977f1e22e3e2705ccf22 SHA-1: 9e36efce6009c05bd4a6043261a06d95754e29ea SHA-256: bef6b99ba16325e1431826056e114b7e13efe8659a79492488d324897768aad0
156 Risk Score

Malware Insights

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

The PDF contains a link farm hosted on disposable domains, a common tactic for phishing and malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of numerous unknown URLs strongly suggest this document is designed to redirect users to malicious content. ClamAV detection further confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://ferrogep99.hu/static/media/file/kibujugigijav.pdf In PDF document text
    • http://lysfyyy.com/upload/files/fedikonolelidinodumite.pdfIn PDF document text
    • http://alexdisinfestazioni.com/userfiles/files/pijevolexogatafe.pdfIn PDF document text
    • https://happycolaborativo.com/uploads/files/87883360662.pdfIn PDF document text
    • http://miyagi.chi-kara.net/Upload/files/99308778924.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/vekuvigelasuras.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161305d322f59c---magefelo.pdfIn PDF document text
    • http://iberryhomemade.com/userfiles/files/68838565267.pdfIn PDF document text
    • http://megalabsrl.it/userfiles/files/26910603338.pdfIn PDF document text
    • http://belean.pl/userfiles/file/3747315739.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/161406670cdfc8---zaduximovopito.pdfIn PDF document text
    • https://indiansecuritisation.com/ckfinder/userfiles/files/tezilagawa.pdfIn PDF document text
    • https://nada70.org/userfiles/file/vabegojinanovozugaregi.pdfIn PDF document text
    • https://dienmayminhchau.vn/uploads/news_file/raposuzawan.pdfIn PDF document text
    • http://viorina-deko.com/images/file/51566429497.pdfIn PDF document text
    • https://dakotaterritorydevelopment.com/ckfinder/userfiles/files/21841336093.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/cd398916d5aa4285c4a700a894a59049/lemalepiv.pdfIn PDF document text
    • http://sonarkella.com/userfiles/file/73706473225.pdfIn PDF document text
    • https://ra7a7p-h3ba7.com/contents/files/labenit.pdfIn PDF document text
    • https://gulfb2b.com/userfiles/file/jowuzozax.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/ee0klfccuq9fakj4thkvch6ff7/10432984936.pdfIn PDF document text
    • https://vinasimex.com/uploads/file/97515991062.pdfIn PDF document text
    • http://webbuilders.com/files/file/wapoba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=american+truck+simulator+download+for+android+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_off0000c40b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC40B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC1D 16840 bytes
SHA-256: eaae7e2e7b09a52780c7df1d0ea3acc4c10ebf89688b136c9d90e2d7019d33f7
font_02_sfnt_off00010775.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10775 11040 bytes
SHA-256: e40e4f0f081c48f285da25b59feed030b9d8b089ee6d3d77e3cbdacc48e32ddd