Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fe3121b7f52e328…

MALICIOUS

PDF

87.0 KB Created: 2021-09-14 13:30:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 84b911900bc4f26d6fc4a4dd18eca0b3 SHA-1: 6a94f88c2607f0824cab7b1459b2e8c494f8a91d SHA-256: 2fe3121b7f52e328ff655e88d9d3ec912973b4bfce5ee94b8a5ac7ef908c22cb
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://supair-lux.hu/ckfinder/userfiles/files/602842512.pdf In PDF document text
    • http://www.sana-anong.com/ckeditor/ckfinder/userfiles2/files/35898863769.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/15246242893.pdfIn PDF document text
    • https://mygoaltv.org/ipp/images/uploads/files/58238142419.pdfIn PDF document text
    • https://zenit-npk.ru/files/file/zabifapabokavomusuwo.pdfIn PDF document text
    • http://chinalabware.net/d/files/lubupixejadoxaxepi.pdfIn PDF document text
    • https://tainandentist.com/uploads/files/202109052204302846.pdfIn PDF document text
    • http://frankslawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tikepu.pdfIn PDF document text
    • http://yunnanyingxiang.com/ckfinder/userfiles/files/berodukekodob.pdfIn PDF document text
    • http://syntra.pl/userfiles/file/gezewepusebubeti.pdfIn PDF document text
    • http://masterref.ru/editorfiles/file/renuxidixere.pdfIn PDF document text
    • https://subded.org/userfiles/file/sofefawidofadijavatut.pdfIn PDF document text
    • https://thegioibaobicarton.com/Images_upload/files/notemug.pdfIn PDF document text
    • https://nepalipublisher.com/ckfinder/userfiles/files/56930225453.pdfIn PDF document text
    • https://citytrafik.nu/images/file/73439205888.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/161361fb7e614c---32459026447.pdfIn PDF document text
    • http://ekstelekom.com/userfiles/file/59772878649.pdfIn PDF document text
    • http://1careglobal.com/upload/files/16796642701.pdfIn PDF document text
    • http://drsrkbedcollege.com/ckeditor/ckfinder/userfiles/files/difuwet.pdfIn PDF document text
    • http://velisend.ru/photos/file/rodejuvonoxinomug.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132b09064e33---12077920039.pdfIn PDF document text
    • https://icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/14450561928.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16132b3a75bf4b---3734777850.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/76f6f278f13f6f44ac7987a423584945/gorajufawakibidubir.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/24222663833.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=telegram+apk+for+iosPDF 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_off0000eef0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF0 10552 bytes
SHA-256: 133400a0de9d3106d0abf5e4de5e3480b9a707a75e44c41ec0c962d1f6e1ebe9
font_01_sfnt_off00010703.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10703 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F15 18192 bytes
SHA-256: d5add86989fcc92e494b061111ef60a8b9b9b4adf2e56f36e972033ae74fa909

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