Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a180ef110dbcdfd…

MALICIOUS

PDF

77.7 KB Created: 2021-09-06 23:54:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ff346b46246a006f042e97edd3b29c6d SHA-1: f1f221f7b1f422bead50bc44bd882eb3da6445e2 SHA-256: 9a180ef110dbcdfd3a62fcc1f79051f834e5639e655c3d06a6ab6ba294f096a5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF contains a link farm directing to multiple URLs, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links. The file's structure and URL patterns are consistent with SEO poisoning and link farm techniques used to lure victims.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b86a09d0840---rijadesal.pdf In PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/16731871a32aba1dcdbeffdb2caa3073/lutatabitelol.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c00503194f8---16237113214.pdfIn PDF document text
    • http://fu-xin.tw/uploads/files/202109040347028547.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b61bb12386d---77348017424.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/vexukizepumukowe.pdfIn PDF document text
    • https://pima-alarms.net/slicice/file/96058057505.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/dikaso.pdfIn PDF document text
    • https://detmers-kontejner.hr/files/4373760508.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/b44c646d6089b82d587f5425a73fa3aa/97334480166.pdfIn PDF document text
    • http://ccspatti.org/userfiles/file/vekavatunovupuxuzexip.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/b53ff7549204f378e5926b86f25c4f2d/29390770552.pdfIn PDF document text
    • http://manisafar.com/basefile/marcosafarir/files/81991152023.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bca8c53fe4b---72832486178.pdfIn PDF document text
    • http://makaroma.fr/upload/file/40302892463.pdfIn PDF document text
    • http://ymjgolf.com/file_media/file_image/file/kadobusobejav.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/qljkdk2dcn6j0053jbis1dq1o3/25497434430.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160851c5eda924---lakimivaviwazomep.pdfIn PDF document text
    • http://eastcity.hu/ufiles/file/bijefed.pdfIn PDF document text
    • http://tfforming.ru/d/files/waxowipamofegusunewo.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/50332031037.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/79c1eafc405b70ddf695f0e2e2b7196f/4120165253.pdfIn PDF document text
    • http://smitheaster.org/clients/861344/File/foloxidurawolusewusebab.pdfIn PDF document text
    • http://parcroyale.hk/userfiles/bipulosutiberopobexelu.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/sojolenaxosejixeduwuniviv.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/23c2ca90b560afd37d67cf776e148b95/nerupuzutif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=tostadora+kitchenaid+manualPDF 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_off0000cbac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBAC 10792 bytes
SHA-256: 3f4e60e915441eb5da4927dd7196df63be95b6b51200fd000d9c27a3d3ef8028
font_01_sfnt_off0000e459.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE459 17168 bytes
SHA-256: f08e680db12b2cd617348deb1eb1cc3a8dbff3ee328e8e2b220900669f50e875
font_02_sfnt_off000110a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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