Malicious PDF — malware analysis report

Static analysis result for SHA-256 afd88eca05245cc9…

MALICIOUS

PDF

68.8 KB Created: 2021-10-01 17:07:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 242915c328cf68b71f0523714640f7b8 SHA-1: 99921ec1bd160c2c44de5a8a9a6547bbf5fed03e SHA-256: afd88eca05245cc90700c0752cc3597ff41afc0244b38c55c72d5aae8fe493c4
176 Risk Score

Malware Insights

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

The PDF was identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains numerous embedded URLs pointing to various external sites, including those hosted on compromised WordPress installations, suggesting an attempt to redirect users to malicious content or phishing pages. The structure indicates a link farm designed to obscure the ultimate destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://ingore.cn/upload/files/15489550762.pdf In PDF document text
    • http://kiko168.com/UploadFile/file/20210911021156581.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e428ff0185---8558817740.pdfIn PDF document text
    • http://stringquartet.biz/web/images/fck/file/lexakevujijugujotekudunor.pdfIn PDF document text
    • http://soskuwait.com/outscapes/admin/ckeditor/uploads/ck/files/17569528189.pdfIn PDF document text
    • http://bradzo-ep.com/uploads/files/86704674905.pdfIn PDF document text
    • http://izeninfo.net/admin/upload/files/73097937353.pdfIn PDF document text
    • https://jaukiaplinka.lt/ckfinder/userfiles/files/wojipigubaxi.pdfIn PDF document text
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/lilad.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/161351097b3547---25247170404.pdfIn PDF document text
    • http://tarp.longi.tw/uploadfiles/wonumasudovupasuzu.pdfIn PDF document text
    • https://businesslife.com/content/files/36712054280.pdfIn PDF document text
    • https://responsible-tourism-alliance.com/content_file/files/14491873038.pdfIn PDF document text
    • https://tolgyesvolgy.hu/userfiles/file/fegamasisowozine.pdfIn PDF document text
    • http://abpjse.news-read.com/upload/files/92176001119.pdfIn PDF document text
    • http://zhodnoceni-penez.cz/is/images/FCKeditor/File/podabisaruzutuvojorikabo.pdfIn PDF document text
    • http://robbymakka.com/userfiles/file/41262391134.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/jimexumonepixarukos.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137a5f6ceb30---jilanavexefazi.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/25881858024.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/kos11hk0lnj2oh6opigmpc3160/zuduvejinawadoz.pdfIn PDF document text
    • http://terremeraude.com/userfiles/file/bejagu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=phone+games+you+can+play+with+controllerPDF 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_off0000b132.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB132 13820 bytes
SHA-256: abd675a853397a2adc8542c18396ad8248dd2003052e0394ba23c04a93dc49ab
font_01_sfnt_off0000d39f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD39F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ebb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB6 11124 bytes
SHA-256: ed4a608cf2b7b72bc60f7b8d2ec92ce25b80e249b5457cbff1712763d62aa4e2

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