Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f0f4b994c686dae…

MALICIOUS

PDF

82.0 KB Created: 2021-09-17 18:11:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1a6e391031054246deff7f6d7c57ffe9 SHA-1: 2e88bf8d990b38919b709cd488e1b0a535d35802 SHA-256: 2f0f4b994c686dae0bf495d31e5669e9a31b8654f1c253745e67d0ad8365e952
156 Risk Score

Malware Insights

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

The PDF contains a link farm, with multiple URLs pointing to potentially compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document's structure and embedded links suggest it's designed to lure users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://mycocoa.org/images/upload/files/domigevozikaboriwolena.pdf In PDF document text
    • http://castrolmintabolt.hu/images/upload/file/fifedumakofef.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/87327964339.pdfIn PDF document text
    • https://linardi.ru/files/file/93257877050.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161441924f1070---21937145534.pdfIn PDF document text
    • http://ayhancevik.com/images_upload/files/45703512425.pdfIn PDF document text
    • http://bhttourist.com/upload/fckimagesfile/35592095745.pdfIn PDF document text
    • http://busangh.com/attfile/fckimg/file///20210917115751_525268922.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/dg3gbr6vcrn2a9jjmeql8rki3f/68065922506.pdfIn PDF document text
    • https://kawanmto.info/contents/files/juwagojuwanitiki.pdfIn PDF document text
    • http://lindendirect.com/tempimg/file/ligezonetomoluru.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/32223548339.pdfIn PDF document text
    • https://heyratacademy.ir/file/pexosi.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140aebe387af---leruje.pdfIn PDF document text
    • http://onlinevay.com/upload/files/verelikekizakebuses.pdfIn PDF document text
    • http://romangruszecki.com/uploaded/file/89254655547.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/b1dfc0cd71be9b83bb3fcdce36685e84/5430023333.pdfIn PDF document text
    • http://bentleyplemtech.ru/userfiles/file/37539268195.pdfIn PDF document text
    • http://musiclivemarsala.com/userfiles/files/74406698590.pdfIn PDF document text
    • http://quiltingacademy.com/fckeditor/userfiles/file/nanirokosoletadasu.pdfIn PDF document text
    • http://uniquehotelsolutions.com/files/others/losiwigarobofotoxubam.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16141af83b8cac---79993685444.pdfIn PDF document text
    • http://nm-union.ru/ckfinder/userfiles/files/37322194404.pdfIn PDF document text
    • http://cocoon-source-harmonie.fr/public/file/wegisiguluvixin.pdfIn PDF document text
    • https://serrechevalier-skifun.com/imagesfile/xuzat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=farming+simulator+20+free+apkPDF 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://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_off0000d7f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F9 11112 bytes
SHA-256: ffb22a5f8288c9be6cdb8eb3712d0bae089a8182853ea455cac93ce084faac18
font_01_sfnt_off0000f1e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E8 18524 bytes
SHA-256: 0272005eabc4b96017426380d3962d5b0865af8b32a86c44a77c439dbcc83a34
font_02_sfnt_off00012221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12221 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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