Malicious PDF — malware analysis report

Static analysis result for SHA-256 a18d497c003bffbe…

MALICIOUS

PDF

87.1 KB Created: 2021-06-25 19:45:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ac4578793edbf7bbdd177578a4986410 SHA-1: 18f9a2e65cfb7a04ea4c348ba6dfbb1f8dea0af3 SHA-256: a18d497c003bffbe4a5959ccf03b61bea192114a16c3efa8a3ca266fdd8c8229
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as a link farm, with many distinct hosts and URLs pointing to potentially compromised websites. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. The embedded URLs likely lead to further malicious content or phishing pages, and the document's structure suggests it's designed to distribute these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://smidgel.ru/uplcv?utm_term=90+day+fiance+happily+ever+after+season+5+watchseries PDF link annotation
    • http://tks-forever.com/upload/2021/06/16/file/pafezaxokobibuzamopujate.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/1953697c2e805ee2278e4c77834aa1f4/11304556192.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c1a709217e1---pimukujajega.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/c6vbe7f11eg5cc5iqp998859ef/25435627029.pdfIn PDF document text
    • http://judyzscotties.com/clients/1/1f/1f1ef5c9f72ce0e5bea5babf356718c6/File/95527656035.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/b13b6b7d26a37dbd36b66f350d56666a/gamajavabolikaxuperina.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/mironebalufozuguwawi.pdfIn PDF document text
    • http://saovietgroup.com/upload/FCK/file/16210734631.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077bcfae4120---84881730658.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/c5a52a097404273c6cd594859a0fb782/jujetewogiku.pdfIn PDF document text
    • https://fultoys.com/userfiles/29562242997.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce63d3841f---waxuvexikejoxowobudit.pdfIn PDF document text
    • https://lacecinella.com/writable/public/userfiles/file/pagabeluroreremawix.pdfIn PDF document text
    • http://iberia-ex.com/images/blog//file/bijaluxifat.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/90da1f9be781bab389507e766bebdcfa/guloxaz.pdfIn PDF document text
    • https://tusenfotingen.nu/anvandarbilder/108/files/lewuvilikatemexuxekemobu.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6b0a6aae3---91263078366.pdfIn PDF document text
    • http://didocrosby.com/imagenes/file/59932014692.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/hfr1cmsfvjfm3jp9uq4lnmvff6/xuperominomozeruz.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/295b376a00821f8bbe03640e94847802/wodavinelelalamu.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2d86de812---75566558561.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_off0000ec3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010450.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10450 17704 bytes
SHA-256: 293c24f8ee34a69764803516d33d7e4535b33d93c830b44e5c31dcc2228c5ac7
font_02_sfnt_off000132a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132A4 11312 bytes
SHA-256: ea91a9203296f6e89f5437c3c4fac026d11c727eb6441790a0dd9197acab06de

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