Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6b94edd19dc6bd5…

MALICIOUS

PDF

81.2 KB Created: 2021-09-22 09:57:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a1ab50bb417c135d16a198dd0d283312 SHA-1: 147080b71acc1533b9f16e078bdfb0fe4a0c2d77 SHA-256: b6b94edd19dc6bd5ddf1df8fbb02187449614cdef6df2ac26a66cabaafee9d72
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. The embedded URLs and the PDF structure suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

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 https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/ffad9ccf7f31f846d86117bb876f7439/potukisiwobapaxejodoga.pdf In PDF document text
    • http://rudolphi.nu/userfiles/file/roborepekuxideven.pdfIn PDF document text
    • https://value.ae/userfiles/file/rozofiloviwi.pdfIn PDF document text
    • https://tekstilkentrehber.com/upload/ckfinder/files/nubinotuv.pdfIn PDF document text
    • https://volandovia.it/public/fileeditor/file/81462686976.pdfIn PDF document text
    • http://qdjshg.com/files/file/zorewozitinexewiwiwakemot.pdfIn PDF document text
    • http://iglozawiercie.pl/zdjecia/file/6621509611.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613c341bb38a4---puretenupiwas.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16135b57bedd64---gixuxulibotodige.pdfIn PDF document text
    • http://salsainkonstanz.de/media/files/35960628338.pdfIn PDF document text
    • http://mxag.com/upload/browse/file/kamaneremopo.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/a071d968a01357dc2d496dd5d47dee86/70962180584.pdfIn PDF document text
    • http://biomax.shop/filespath/files/20210916155538.pdfIn PDF document text
    • https://inunekocp.jp/mailmagazine/upload/files/61487256806.pdfIn PDF document text
    • http://pelejas.com/IMAGENS/CKFINDER/files/zopopowapibunu.pdfIn PDF document text
    • http://cleangroupbd.com/ck/upload/files/3447335472.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/kisuzebukagaliwigowijik.pdfIn PDF document text
    • http://islenapuntos.com/campannas/file/72687189097.pdfIn PDF document text
    • https://mallncart.com/userfiles/files/zajegiwowudiw.pdfIn PDF document text
    • http://pelletier-tp.fr/ckfinder/userfiles/files/78398671047.pdfIn PDF document text
    • http://pravkniga.ru/files/userfiles/files/58979204111.pdfIn PDF document text
    • https://fibaquitaine.fr/cebatrama/userfiles/files/lunizipatunagup.pdfIn PDF document text
    • https://www.db-ynox.fr/ckfinder/userfiles/files/50467688730.pdfIn PDF document text
    • https://dmitrovka-zn.ru/admin/ckfinder/userfiles/files/tajez.pdfIn PDF document text
    • http://edins.net/userData/ebizro_board/file/90695930230.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=how+to+move+content+from+phone+to+sd+cardPDF 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_off0000d6b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B6 10892 bytes
SHA-256: 1a279e27943de8d55b6d1bd9f36490707b9c1e7bb0475095d8cb3ce4d6ecfacd
font_01_sfnt_off0000efbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D0 18376 bytes
SHA-256: c836ab9a44984ba4edc707054f6e0204f3846318118df60f3e4e4cd4d273f69d