Malicious PDF — malware analysis report

Static analysis result for SHA-256 df2c5cfe967211bd…

MALICIOUS

PDF

90.5 KB Created: 2021-06-28 10:09:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-07-10
MD5: ce2f3c748b8def8f3a8d5ae4810e2677 SHA-1: 3d0937b6cafccbe48f5cb749fd178eb582cd7af0 SHA-256: df2c5cfe967211bdc37c0d16f3528f4b52a0ab56633f373c5f4cca8672b75ee4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics as malicious, including a machine learning classifier and ClamAV, which identified it as a phishing trojan. The document contains a link farm pointing to numerous disposable hosting sites, likely intended to redirect users to malicious content or phishing pages. The presence of external URIs and compromised CMS upload links further supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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=best+places+to+eat+lower+east+side PDF link annotation
    • http://izumrud38.com/ckfinder/userfiles/files/64184752209.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/fa3d559fbf46b6c9fe6a2a0b2afbc88b/buzobibawinesoz.pdfIn PDF document text
    • http://mea-travel.pl/userfiles/file/65805134585.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3950d6750a---wudexivegisesi.pdfIn PDF document text
    • https://bloomlight.pl/_bloom/file/65851725842.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/9d6d22165b493a23751a8d36aae00210/detumawalameloku.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c32e84caa---dikifudulewosatoze.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/246ac4d2c3455c23fcb6671ddeb32ba6/punevozurosidem.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.net/FileData/ckfinder/files/20210621_FFDDBAAAD93255DF.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/93787fbbce768240f04d1dbcd63b13ae/rekupagofukajasulirugis.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afdb40921b0---ponazojorimadixupolor.pdfIn PDF document text
    • http://suamayin.biz/userfiles/file/botewog.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/4849fa0dc1c2c786002a0e222b6b276b/82133386650.pdfIn PDF document text
    • http://pratiklinik.com/img/userfiles/files/tufugezikawirubiwut.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0cbea01912---31842419069.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210514083038_1484764960.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2a3386e7382922b84300aeb0ee7cffd9/sojusizi.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/3n7vm57i97vall04b7roicddg6/46897134703.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/vesiwogunumotexal.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/16077d7468b7c0---jozet.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/ee9b9c73d2281247b849cde11a7a92ad/97828121543.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_off0000fe40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE40 17164 bytes
SHA-256: 26a0cc16280426cdcad6397ca1ac3a7abdc70ecd9922563fbb8b778483bdafd9
font_01_sfnt_off00012ae4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000142fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142FB 10540 bytes
SHA-256: 6d789a7a30eca6d2022199b3f0aaf4e333786f8d5e72ef56b209e79086574ecd

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