Malicious PDF — malware analysis report

Static analysis result for SHA-256 38f117f707ec0870…

MALICIOUS

PDF

78.2 KB Created: 2021-06-13 16:46:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 533db38a81de934084bcda57ecb6e1e1 SHA-1: 1f860bdd560ec68fc85a5b08c7b3b19cc14fe9c5 SHA-256: 38f117f707ec0870d51f4c72a7ecabc677954df46024cc9ae241049709eb8922
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by 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 5

  • 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://laborke.ru/uplcv?utm_term=nenu+nanna+naa+boyfriends+songs PDF link annotation
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/2amsv53adb6qb31oh2opeeo697/41118725974.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/s0fvt67aqp6h74c1r5obk49om7/8495896615.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/janotarelu.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f67545ccb5---dajagofi.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/87148434201.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5c4ee2c25d---26179679396.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097a80f2edf8---78278628828.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16076b07738fe6---39954522392.pdfIn PDF document text
    • http://benhvienlaptop.biz/userfiles/file/texupemokozenevudirulip.pdfIn PDF document text
    • http://xiaohecollege.com/d/files/jumadexamoxaxeso.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/jfgrmqu918bu8q56v1dlqce5js/dovowasove.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f189fda694---90223706998.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/3uis4jv9u0fqbsbg1sncdabqj0/64529303085.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1608a755b5be3d---82531005795.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/21461334806.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C9 5256 bytes
SHA-256: ef2a598c4023883e766f59607d5bc7999895f7e6df4cddefc5463311b99ff4ef
font_01_sfnt_off000108c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C4 10780 bytes
SHA-256: 01f07fa93cf04fd584186bbbc95bd1b5f134658253f8363c59d02cd32a5b306d

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