Malicious PDF — malware analysis report

Static analysis result for SHA-256 02f58ee3fc3c9caf…

MALICIOUS

PDF

60.0 KB Created: 2021-06-19 04:34:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: d59f1aabcbe63da583cca1d9bbe9ef2a SHA-1: a2ef6bd339f970c87db77a8c5b99176580230314 SHA-256: 02f58ee3fc3c9caf53222c26e3ea7730410cba1ba89f1c9d1b55d3f15ab5385a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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 0.9996

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://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/c405367dccdec26ab1a1247f62f78402/zeviteludupab.pdf In PDF document text
    • https://oddluzanie.net/userfiles/file/difobakoz.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/bhqt98hdj1qu4s7oh9tub9mf67/3277819251.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/c84hu9nscqdden63n4p72b7u93/nupebelomozipofegilol.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/xexetasajopiwifeg.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160714d52232fd---fazixanejewuzowubisagopek.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160b2ff10689b2---88332567737.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/12167dafbf1e552c9dcbd96966291c91/36207309224.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607673ae0f53b---4415217358.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/93af38dbdeaf56725cbe69f2f8c02a4c/85926460590.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb099fa776f---90912516501.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc36649eb2---katuvuvunutogunorizod.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/lulexabatiruwuvi.pdfIn PDF document text
    • https://miaousland.fr/ckfinder/userfiles/files/pagesojozoxewegugokuf.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/13f90fea9aafcd3dc0c1dc43ff4f6e3d/71043246618.pdfIn PDF document text
    • http://kondicionery-lubertsy.ru/upload_picture/file/87064330936.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=human+figure+drawing+test+koppitzPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b05a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB05A 5496 bytes
SHA-256: 5301f1fbea58d54ee90195ec8105de6e2cd3de3a9ae59a2cf8456346d70e52cd
font_01_sfnt_off0000c315.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC315 9428 bytes
SHA-256: 83b561c144f90f25d156f163eadc43fda8cba3a6550c4f6690613dff95e9e3ea