Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cb051cfd9dceff2…

MALICIOUS

PDF

70.1 KB Created: 2021-09-03 04:13:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ba0ce8d1bfd8f32d515772f3c800b576 SHA-1: 24f146ef882c83988a7c1e1314ebd01129cd000d SHA-256: 6cb051cfd9dceff28fa2ebc6191593b5745a35e6aa12ca3f4349a62643b555cd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous embedded URLs that point to compromised websites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of multiple compromised CMS upload links further supports the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/kkp3ak0r5d8lth6mmsmik1b1tk/domakerukiro.pdf In PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6c8b41c265---58492993591.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1686f4c39f---giwolavobewejinivevuwuw.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/4736461450045de4f8134b98fc3d3315/96628456761.pdfIn PDF document text
    • http://hanboo.cn/Uploads/file/2021070305381870554.pdfIn PDF document text
    • https://familienbilstrup.dk/userfiles/file/59181001921.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d9f2fc9fdd---69796645235.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609b9825729ee---4234253403.pdfIn PDF document text
    • http://hangquangauto.com/files/fujamotututurozupugabis.pdfIn PDF document text
    • https://purefeeling8.com/data/file/jibogileta.pdfIn PDF document text
    • http://handinks.com/ckfinder/images_store/files/96995926649.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/498b312c523114a0e07c9ae24ac21972/66287034540.pdfIn PDF document text
    • http://dragoniresorts.com/userfiles/27555539790.pdfIn PDF document text
    • http://nebovsem.ru/app/webroot/files/files/funaxosipupijutojidag.pdfIn PDF document text
    • http://huerural.com/uploads/image/files/84965753432.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/31969833084.pdfIn PDF document text
    • https://kingdomdatesuae.com/userfiles/files/44389768666.pdfIn PDF document text
    • http://omatsuri.kr/data/userfiles/files/minude.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/rifevepar.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/urq63alhfvkjs3vngsrsbc0sv2/34820568615.pdfIn PDF document text
    • http://wenyanchem.com/upload/files/2926404168.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=differentiation+of+e%5Ex+pdfPDF 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_off0000b58c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB58C 10428 bytes
SHA-256: ccd850c20253a2c834500241ebff5d9e9213d92260313021aa86703daa1d5ec5
font_01_sfnt_off0000cd57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD57 14896 bytes
SHA-256: 1d422ce494f2974c5b808fcd7519f00bc9ece864a49ab5783d576a02eb6ee4ed
font_02_sfnt_off0000f2eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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