Malicious PDF — malware analysis report

Static analysis result for SHA-256 280f8fc86c1fa77c…

MALICIOUS

PDF

79.7 KB Created: 2021-09-19 05:22:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5497af8e402c44df25e00c4790c8da26 SHA-1: e254c46f6f5a4e38a1fd8724b3ae4c4e69d5daa0 SHA-256: 280f8fc86c1fa77cdff7bd2ae8ef3a6d70b6dcceb72f41a87f9f4606ef7aa81d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm hosted on compromised CMS uploads and disposable hosting, suggesting it's designed to redirect users to malicious sites. The embedded URLs, while numerous, do not provide a clear second-stage payload, but the overall structure points to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/5807294271.pdf In PDF document text
    • http://vip-cond.ru/userfiles/file/97109690856.pdfIn PDF document text
    • https://devcons.org/uploads/userfiles/files/piretubewerikoto.pdfIn PDF document text
    • http://dangkykinhdoanhkiengiang.com/upload/ck/files/bevakumedakikov.pdfIn PDF document text
    • http://kondicionery-lubertsy.ru/upload_picture/file/26187969027.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/10a8d2aef676705e83738d6ded6cc7a4/36592534866.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d43fb750b4---9411023032.pdfIn PDF document text
    • http://nhatrangpalacehotel.com/app/webroot/upload/files/41588299180.pdfIn PDF document text
    • https://calienglish.com/ckfinder/images_store/files/zenewepevikaxopoxi.pdfIn PDF document text
    • http://dh-life.com/ckfinder/userfiles/files/kugamunebogofumekululemif.pdfIn PDF document text
    • http://hanleyresources.com/images/38426666066.pdfIn PDF document text
    • https://casartigianiudine.busletter.it/ckfinder/userfiles/files/duzutazot.pdfIn PDF document text
    • http://arnoldbolingbroke.com/ckfinder/userfiles/files/migovoboredujemod.pdfIn PDF document text
    • http://gazdalkodjokosan.hu/img/userfiles/file/60710572793.pdfIn PDF document text
    • http://sarkar.ie/userfiles/file/varedozujodex.pdfIn PDF document text
    • http://www.golfusa.be/userfiles/files/dosepubupativokiri.pdfIn PDF document text
    • https://sportcity.bg/webroot/img/content/files/kilogilav.pdfIn PDF document text
    • https://ctapigroup3.com/contents/files/faravozugezobibedofov.pdfIn PDF document text
    • http://louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/lamejupukenafep.pdfIn PDF document text
    • http://laihoawedding.com/app/webroot/upload/files/rukuwu.pdfIn PDF document text
    • http://herfon-machinery.com/images/ckfinder/files/20210916141113.pdfIn PDF document text
    • https://lifetides.ca/cambridge/uploads/files/kujofo.pdfIn PDF document text
    • https://qkon.ca/images/file/ruxoxunajuletav.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1613b5a620c5b5---64506898661.pdfIn PDF document text
    • https://mclandpin.com/calisma2/files/uploads/kunukifokifarada.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=tizen+tv+vs+webosPDF 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_off0000d594.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD594 17380 bytes
SHA-256: 7d12586362695260ca81a70072a882e8aed77382cf7393d61693530bbf5a547d
font_01_sfnt_off00010278.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10278 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A8F 10108 bytes
SHA-256: 8fcad2f451564f76cd615e1d4793a3b81b104a12f5f5b206f0578b572f30a2c9

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