Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf50930965ff792d…

MALICIOUS

PDF

75.9 KB Created: 2021-06-29 00:05:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 76ac100f65ae39e594c0bbe813c95ebe SHA-1: 16b1a6ded9429bda822670a2047f7df680f8c17b SHA-256: cf50930965ff792dc93bd92cc6fb62fec7fda1ece4acef66fb05793ca3d546c6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier. It contains numerous embedded URLs that point to various domains, many of which appear to be compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The presence of these links and the overall structure indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://catamma.ru/uplcv?utm_term=the+complete+book+of+chess+strategy+pdf+free PDF link annotation
    • https://baoyi-chuck.com/ckfinder/userfiles/files/5120307618.pdfIn PDF document text
    • http://haithuanphat.com/uploads/files/26262462951.pdfIn PDF document text
    • http://lideparts.com/userfiles/file/1622824620.pdfIn PDF document text
    • http://hrjok.com/uploadfile/file/xekevufidukupojifuvo.pdfIn PDF document text
    • http://www.proyecpapel.es/ckfinder/userfiles/files/guvobiwoxakak.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1608e087d403e4---19608775826.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fdad6ec95f---xizubovas.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ba93fd8dd8f---fotikodedavonulovi.pdfIn PDF document text
    • http://nextgenship.net/upload/file/20210614162368715399.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/41608815585.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/22d405994b0120cdb9ba2467b2f765d6/xinadosowisopukukixixigag.pdfIn PDF document text
    • http://washchienluoc.com/upload/file/17362465113.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/medeverafaxuvije.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607da76077dfb---futunuzojolefesonan.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/a93256060c6fb86748ff1bf745fbc873/nikokeg.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607659b2ac921---10031052526.pdfIn PDF document text
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/8566609840.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/2157dbafc5af761c9c32c0c3308f36fd/fulegatesavepeg.pdfIn PDF document text
    • https://bouwservicewinthagen.nl/userfiles/image/file/5869296724.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b09285b9e3d---25803379563.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/fajeradoregemawetawelapib.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160876a3aae540---bagoxefebororegu.pdfIn PDF document text
    • http://normel.org/files/upload/file/30550735620.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a1437d2e2e8---17756510732.pdfIn PDF document text
    • 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_off0000c427.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC427 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC39 16828 bytes
SHA-256: 24f195c44618a1da6dd23d1409a0e0353650535516d9705e92c665599b56be19
font_02_sfnt_off00010805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10805 11180 bytes
SHA-256: b441157d31a63343c50b0cb1db15a4a7dae51d76aafff8137e4a1992d89471d9

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