Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbba7626218621dc…

MALICIOUS

PDF

80.3 KB Created: 2021-09-23 01:02:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 0659ae49f554f6e7313daa8c40708b12 SHA-1: 09d598b1c9ee80c4c7dc19adcc891200ebd06273 SHA-256: dbba7626218621dc30c73144ed8bbc6f830af948ba3c84dd17a88faf9264fa58
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised CMS upload locations and disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing lure, likely attempting to trick users into downloading a malicious application.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://jwconsult2005.com/file_media/file_image/file/vunuzusizas.pdf In PDF document text
    • http://seyrimerdin.com/userfiles/file/zupelelolufolubos.pdfIn PDF document text
    • http://esrafisek.com/images_upload/files/32456637818.pdfIn PDF document text
    • http://www.dogwoodagility.nl/ckfinder/userfiles/files/7683542204.pdfIn PDF document text
    • https://dnsbp.com/all4help/fckuserfiles/file/9433583601.pdfIn PDF document text
    • http://www.brickchamber.com/ckfinder/userfiles/files/ribazara.pdfIn PDF document text
    • http://popmetre.com/news/files/vawavovefebovoropas.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///19941178876.pdfIn PDF document text
    • http://qlinairnv.be/userfiles/file/jamojerubatexeriwaradi.pdfIn PDF document text
    • https://gamaconsultores.cl/upload/file/zoleji.pdfIn PDF document text
    • https://timminsrenovations.ca/file/gOL7QMBMGCTdwgWz.pdfIn PDF document text
    • http://postelezmasivu-brno.com/ckfinder/userfiles/files/pelexukiliforob.pdfIn PDF document text
    • https://maytinhdalat.vn/images/uploads/files/guxijizedeluzabowitise.pdfIn PDF document text
    • http://hairtransplantmangalore.com/uploaded_files/userfiles/files/39393340989.pdfIn PDF document text
    • http://polaryachts.com/res/wysiwyg/file/75992116940.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1614ba3da3034f---bexepupabuwakixas.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613ece921e30e---pipozovasiwijiwapudotot.pdfIn PDF document text
    • https://globalybm.com/ckfinder/userfiles/files/1632120677.pdfIn PDF document text
    • http://noahmission.org/dataroom/file/63508829979.pdfIn PDF document text
    • http://zeguvietnam.com/uploads/ckfinder/files/11623908516.pdfIn PDF document text
    • https://sadhankendra.org/erc/media/18260045537.pdfIn PDF document text
    • http://dep14kirov.ru/userfiles/file/saduxutarigisowubu.pdfIn PDF document text
    • https://egf.tw/test2/images/file/nebababezozufanavarov.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/ace85a51267fc71cc69d71b565002e24/42718659867.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=download+the+videoder+appPDF 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_off0000ca5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA5D 22260 bytes
SHA-256: 87b60184069d2ac1f74eae646c321ebbdc18417f6885b8b4dffe49326fe9cc5e
font_01_sfnt_off000103ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103FF 10476 bytes
SHA-256: fd9b149565a3b79bfd4f39e6bebd65f30105b4f4c45d966d091d6a260130a908
font_02_sfnt_off00011bb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1