Malicious PDF — malware analysis report

Static analysis result for SHA-256 884882eb61c0b084…

MALICIOUS

PDF

113.1 KB Created: 2021-06-13 13:33:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: bde68d08c8eb985b5ff0f37842894c71 SHA-1: 9847651680a2cbc974e415b77e13e9dd49e7d58d SHA-256: 884882eb61c0b08435b040aa5095f6043ef97ca1de72425189d7e3d62ad942e5
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 0.9997

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://huntic.ru/uplcv?utm_term=hand+signs+for+fire+style+phoenix+flower+jutsu PDF link annotation
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/ffbd52fb6d365d0d12385963aa9ca507/35989258253.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/lezafidinoralusilemu.pdfIn PDF document text
    • https://circolodelpistone.ch/userfiles/file/vujoborikagotuni.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/s6iv0f1btedc4m84588k6cbit1/tuxituno.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c3f584c45---89663365781.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa15bb8d8b6---nugebijado.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/4224f5fabe134dd584f9608a93844c24/72470145844.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160777f9a5bf52---48816063536.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/9672ab736ed70113341eaa6eb4bcab57/bofuzopabes.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/8f4cab6e6c491886b1253fbdf8dbc594/junivikuruzilizukavevalu.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/4f0g4celcn2cotr4lhar540979/51010527769.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/17226759238.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a017aa4173c---roxuvasupapag.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160969de3e7e91---gerowewamojabusuvufut.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/zifukiwaxifaxokotep.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f68384deea---37589877401.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb5bb12f29---64742574779.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/k2sphka8sprruio9g2hpmal4pm/nigudenazi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015824.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15824 10472 bytes
SHA-256: b6c4dfb1dbb3cfc887afda901217f8d9142fe2d3a9c856317c9ca1915af369b2
font_01_sfnt_off00017ad7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17AD7 5600 bytes
SHA-256: 60b1195885c1812a7fc2f91f4c8813f9d882127d99ccb0236e76cee5f65a2467
font_02_sfnt_off00018dff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18DFF 12172 bytes
SHA-256: 8839aa35991207fb48788c32ba2b2ed09869119330c1bc1cf944ee1988196cfa

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