Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c8d3439637dcf77…

MALICIOUS

PDF

53.0 KB Created: 2021-09-25 13:30:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: af02d4fc38ae9c737a1398379d9bd914 SHA-1: 1c5fc4e3622ef1ca790aee7fabaec10b9a4116d7 SHA-256: 0c8d3439637dcf7750522c5c8c3a6b33e0d08c335705b00f8383c213627f3e36
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised CMS upload directories, suggesting it functions as a link farm to distribute malicious content. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicate an attempt to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8448

Heuristics 5

  • 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
  • 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://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135799248f54---bodasatow.pdf
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/vmlmvnltfi43js4bu6jtv1hkq5/guwogotonofovasez.pdf
    • http://bkdesign.ee/userfiles/file/28520612987.pdf
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/87e7aced78911c2bc1c78a6b4e8c4bc0/vizovotepa.pdf
    • http://ladispensadicampagna.it/uploads/assets/file/19833393526.pdf
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139c6e8cb201---bomegil.pdf
    • https://ozanetiket.com/TasarimAcarnet/serhali/upload/files/zubuzazixu.pdf
    • http://egitara.com/upfiles/files/vutekesusonusoloxupazapon.pdf
    • http://yushendesign.com/images_fck/file/1632243350.pdf
    • http://debeight.net/UserFiles/File/gigadonudekiv.pdf
    • http://serbanindustrialconstruct.ro/uploads/files/wiket.pdf
    • http://mayphatdienngocquang.com/media/ftp/file/sazoxekanojolafiketiwa.pdf
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/6612fb61aebf17ef68fb8775edd15ab4/15643356921.pdf
    • http://abw10thstreetne.com/uploads/files/gosasemakudorowusop.pdf
    • http://15441707.com/data/board/file/20210905223412.pdf
    • http://chandravanshi.com/userfiles/file/93625799137.pdf
    • http://mosvag.ru/img/lib/file/wixozilakeketimopuje.pdf
    • http://studioarchterreni.it/userfiles/files/gizugi.pdf
    • http://renovfab-menuiserie.com/userfiles/file/65032278530.pdf
    • http://ilsungwarehouse.com/userData/ebizro_board/file/8344608205.pdf
    • http://kanoonkaraj.ir/dbmanager/filebank/htmlgallery/file///redusiraripe.pdf
    • http://nacyc.jp/Upload/file/41565631964.pdf
    • http://halongbaycruises.org/upload/files/56748716647.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=unity+how+to+build+for+android
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ae1a.bin
25db3937c9d99e55d058ff1b91fce828c582662b1d551f9c1d4f82b9908a45dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAE1A 10596 bytes

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