Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc6df35797ae13a6…

MALICIOUS

PDF

134.8 KB Created: 2021-07-24 20:32:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 54ad9328f40b2dddb1b78f30f5387deb SHA-1: a774a988d40adad59c5e23df43c43573f5553273 SHA-256: bc6df35797ae13a671c377e86837d20a2e032d5a90defc6e728ea82ee25c18ed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads and disposable hosting, indicating a link farm designed for redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://banglatalkies.com/dynamic-images/cms/file/94186090051.pdf In PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/wajokofajajav.pdfIn PDF document text
    • http://cserepakcio.hu/xdata/file/81297215173.pdfIn PDF document text
    • https://aplusadvance.com/naver_editor/data/file/lafadoletad.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/liwobakizajamem.pdfIn PDF document text
    • https://pt2-turbo-j3t.com/contents//files/wapige.pdfIn PDF document text
    • http://chokmanee.com/userfiles/file/lagopesade.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/sipememax.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075bc8ca5df8---81858714515.pdfIn PDF document text
    • http://sqc.jp/user_data/editor/ckfinder/core/connector/php/upload/files/34097501102.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160abcadb803da---20012192476.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/kobukazavofiso.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/9m26jpplv501a7iep3rdrgu4h0/32966575594.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/e8d5e24b0c4b8d7890202383f6c8f4b5/rejofawokesigadif.pdfIn PDF document text
    • http://rockhouseschool.com/rockhouse/uploads/files/buripox.pdfIn PDF document text
    • http://coiffurenais.com/userfiles/file/36785456743.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/m4ps9l861iem5otrr8vhs4ju91/1046518491.pdfIn PDF document text
    • http://retco.ge/ckfinder/userfiles/files/86200359099.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/844dfbb6a730be2ee4da98834da26ca7/jibefepupapa.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/dixina.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b4b22edc1c5---89402102284.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160736ac719920---13406186957.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=resumo+guerra+fria+brainlyPDF 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_off0001a981.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A981 10856 bytes
SHA-256: ab1b5bae292adc2f6c7a3fda37281c61ce111eed70ae8ee3ae2000f3be8fe782
font_01_sfnt_off0001c28e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C28E 19892 bytes
SHA-256: e1561f3b6ee35952ee2131e5928cc99f04fe7586ed16bb039c97a3d6f02c900b
font_02_sfnt_off0001f32e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F32E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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