Malicious PDF — malware analysis report

Static analysis result for SHA-256 735658b02ded8cea…

MALICIOUS

PDF

83.6 KB Created: 2021-06-17 16:58:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 39fbea11408c93e06de67a4daedd3d5a SHA-1: 44f0d9bb0b64940f92811613804f8c007b244cee SHA-256: 735658b02ded8cea7f28057f80dd417fed341593850c3e6c056286c1f9c29432
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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://chcial.ru/uplcv?utm_term=manga+hataraku+saibou+black PDF link annotation
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/ef898553da736f90d626e6cd2ab9667d/53171620259.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/66ddb0226c8f0b9c22137f02c01977e3/pisoxivaguwevizogo.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/6f0b8657e503bb27cdd6b7796407081f/matilededikorikusexo.pdfIn PDF document text
    • https://ringid.vn/ckfinder/userfiles/files/15044645173.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16073b26140b32---62933700182.pdfIn PDF document text
    • http://olneyjune65.com/clients/d/dc/dcef5d22f85ec69f5810ba62c2e8cf46/File/35681537945.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce81e8c590---79255156011.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/673b22ab6c3b6e7a63a066a47fb68513/pixexigeso.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210605044757.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607113380cdaa---56142726287.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/1874611812.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/23311366106.pdfIn PDF document text
    • https://skinrepublic.vn/webroot/img/files/41654708671.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/84760154248.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
    • 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_off0000f1c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C8 5268 bytes
SHA-256: d465ad05a5be1b3e92224a6795ba4130e5f37da3650edd7c1644ba1e00523fad
font_01_sfnt_off000103bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103BD 13404 bytes
SHA-256: 803239dbb7c6d079be89ed43f192f8a2a108d25f63606fc421c672651b9864f3
font_02_sfnt_off00012d04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D04 16172 bytes
SHA-256: dc81cd4a696a878a4fbbde3493283acaa0ebb1b6d8b911827813da393fc73cd0

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