Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8d02e583670bf0a…

MALICIOUS

PDF

87.8 KB Created: 2021-08-07 17:12:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0e8f26c212bf9e466730a3710664a00c SHA-1: 7503e55208f2b9d8223dc62e203f1594615f79bf SHA-256: b8d02e583670bf0a7a1e64b8b3d8c92e303189d70c0eae34a7523543dcb0eb78
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is a PDF identified as malicious by ClamAV and an ML classifier. It contains a link farm with numerous URLs, many pointing to compromised CMS upload directories or disposable hosting. The primary function appears to be directing users to external sites, likely for phishing or malware distribution, rather than containing executable content within the PDF itself.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/6b41bc1b98b6b3659ae5b4d43af35e51/diwejasaxa.pdf In PDF document text
    • https://efficimm.fr/userfiles/files/pibevedodegemodulilifinoj.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/241837333690.pdfIn PDF document text
    • https://derechosenred.org/aym_image/files/jarizaxilofuto.pdfIn PDF document text
    • http://zeguvietnam.com/uploads/ckfinder/files/852852932.pdfIn PDF document text
    • http://mellorymotors.ru/admin/ckfinder/userfiles/files/mesadadunomuwexebedil.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/zadenaruvulajuzoli.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610542d37cdf0---jizabum.pdfIn PDF document text
    • http://stevis.cz/files/file/gedexikutibafolem.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/ee36adc7710499facf5516ceef183fa4/58653660617.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/wizavokapilogegabutorodal.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f4d28d50cac3eddc4645b39ef7d93b22/52231760785.pdfIn PDF document text
    • http://dietaltop.com/userfiles/files/68235699988.pdfIn PDF document text
    • https://tavcam.com/upload/ckfinder/files/babimobijot.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/b85e1eca99719cf5db0c600e05f8ce60/mozuzibidasirasegagixod.pdfIn PDF document text
    • http://e-hane.com/files/56040499160.pdfIn PDF document text
    • http://autoscuolauniversale.it/userfiles/files/99975871677.pdfIn PDF document text
    • http://aranykoronakft.hu/userfiles/file/fuxigurojivuwofiravorirul.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/tokapiginetimepuru.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/a2b8a3e6fb82d17ac43ff7911367fc0d/54429940412.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/sivavujojiwatanobunofosa.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/46a7739c605aadcc6a2ae48e67dda72c/38377591381.pdfIn PDF document text
    • https://aplusadvance.com/naver_editor/data/file/76688669723.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/a151d65505c143ecdc4ffa63e2f70f98/80843878078.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f631d0725---tewibutuxununug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+summarize+a+chapter+in+a+book+examplePDF 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_off0000f2e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E8 16848 bytes
SHA-256: d4e018ada009983e2b522f0199c480994ee2fb25d7a851d7e507e3b8fcbfae84
font_01_sfnt_off00011e71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013688.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13688 11212 bytes
SHA-256: 0d80e0e249f3b7c20f4868c4cdba80ffad3300f5fb5ec20c6a0b4958e60818a6