Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cbd9d4b47c7c22f…

MALICIOUS

PDF

85.8 KB Created: 2021-06-30 08:07:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 945ed9ffcf73033d1e14a749618632bc SHA-1: 281bb603439ce451aa6e7f626ad91fab319c8d37 SHA-256: 0cbd9d4b47c7c22f882ee9079e44e2ed345b0297ebeb212762efb9fd8d224da2
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document's primary purpose is to act as a link farm, likely to distribute malicious content or phish users. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://binarbaid.com/public_html/userfiles/file/vudagakefapemabudusal.pdf In PDF document text
    • http://randoquad72.fr/userfiles/file/powolekodi.pdfIn PDF document text
    • https://morabia.fi/images/file/dufageve.pdfIn PDF document text
    • https://bouveau-consulting.com/userfiles/file/64415466882.pdfIn PDF document text
    • http://alliusie.com/userfiles/file/23642193194.pdfIn PDF document text
    • http://tranhdaquydep.vn/upload/files/pukibodurakasinirise.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607b90dc46faa---85835199880.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bcef166ad6b---nilasotagegiganotelu.pdfIn PDF document text
    • http://vmkmsz.hu/userfiles/file/68354713844.pdfIn PDF document text
    • http://montgomery71.com/clients/34132/File/9191541229.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/tijurijibop.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160929ddd0d6a4---zuzulabuputot.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081f9632c3d7---folabimifodajekuv.pdfIn PDF document text
    • http://wo-kop.pl/userfiles/file/27308677432.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-6-17/20210617161616255408.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/743vupfdd9kobrk21oqccoc5vu/jovilow.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/wezekagazifosesebi.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/f8e041946ede3aa28d4e8c742c0428af/negitava.pdfIn PDF document text
    • http://camonetinternational.com/files/file/wetonutatotifamonazev.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/l39hpjk4rrsuklg558aoggkv11/25444028450.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a06ed33e597---foxukivesuxisoni.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/gvfh2a5d7rof9enk9qc4adf7d1/41631168987.pdfIn PDF document text
    • https://noddy.nu/images/file/wumigovozo.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/c68b878209d2c78d0d91cfefc8fbca03/3184038588.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160afc0943dcc1---vadudigivepa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=do+purple+and+pink+go+togetherPDF 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_off0000eb69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001037b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1037B 17868 bytes
SHA-256: bfd27a06ec8ae42926cfd6d436cdf3c985e22498b80a3c6615455f86e878e018
font_02_sfnt_off000131a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131A5 10696 bytes
SHA-256: 2d342e3ae1f1d93244352789213b7bbc85e392c7f193ccdf348e087de49ceda9

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