Malicious PDF — malware analysis report

Static analysis result for SHA-256 0909f6c001b2b32d…

MALICIOUS

PDF

82.3 KB Created: 2021-08-12 09:04:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-25
MD5: 2e5dabffdd1dfb0242b6f535b9c92689 SHA-1: 0b9a008870f82192039ac5766acb76dc2686bf3e SHA-256: 0909f6c001b2b32d22bf2329219b2512b6a23501d4301b356baf7a5a33ed89f8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://coretry.ru/uplcv?utm_term=moldes+de+bebes+en+foami+para+imprimir PDF link annotation
    • http://greenplanetnepal.com/userfiles/file/19070398367.pdfIn PDF document text
    • https://rugerwafers.com/demo/ruger/beta/userfiles/files/gowanasop.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e561a325c46---49738137561.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f2a77cba24---jipebekorasesidadeju.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/992e2c0b19623e45afa465a99d3ce27b/parugepaxewaror.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/sumajikanotiwulano.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609c4c9ae481a---retunimoxavu.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/66190895302.pdfIn PDF document text
    • http://7seapharmtech.com/Uploadfiles/files/rumetunu.pdfIn PDF document text
    • http://henca.com/files/details/file/38136369175.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/tofepigitenos.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/00278fcfac5b15f023d10c2c2bc6a845/jojasesapinelil.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/31142649854.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092a607ed38e---38684418492.pdfIn PDF document text
    • https://terminal.hr/userfiles/file/rubumopeminorajaweloxafi.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-9/20210509131141676353.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a370e4c6087---bibes.pdfIn PDF document text
    • http://liyangah.com/Upload/file/91165487181.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/2ae9aec734085a5740e3a352ff59e4f5/41628375473.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080f94e82587---79701730591.pdfIn PDF document text
    • https://korzayithalat.com/spot/admin/fckeditor/userfiles/file/30335845973.pdfIn PDF document text
    • http://isgsrl.it/images/file/lifuwefufo.pdfIn PDF document text
    • https://codecs.roimages/file/dofezovewa.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/9a07467c8d8b16326d68153aca254b1c/tusodi.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_off0000db58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB58 10696 bytes
SHA-256: 6d8a587ac977d026fbd2f5b14e594a7ff89d7225c3519acadd72b1d485e0f30d
font_01_sfnt_off0000f38d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF38D 17604 bytes
SHA-256: 86a56cedb4d5a9f6fb49af516d374cb54ed305fa37b8b37c0eb5cc9fa596237b
font_02_sfnt_off0001203c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1203C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1