Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d62127d4b22fe4e…

MALICIOUS

PDF

81.9 KB Created: 2021-09-20 17:10:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b14a7e5b8a2e9eeec60b25a307da1ca0 SHA-1: 71419a68fe7c5accd392e3d0c9a72485974b5068 SHA-256: 1d62127d4b22fe4e28e0414a5d0e60d66075b1938ec28504dd1de048dc11d219
156 Risk Score

Malware Insights

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

The file is a PDF that contains numerous links to other PDF files hosted on various domains, many of which appear to be compromised or disposable. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of using these links for SEO manipulation or to host malicious content. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature, suggesting it's used in phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://postelezmasivu-liberec.cz/ckfinder/userfiles/files/ruzabafapuxuzimid.pdf In PDF document text
    • http://5thaveseniors.org/userfiles/file/wekozewezazunigaz.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16137b93ca1465---molaxu.pdfIn PDF document text
    • https://ciiinnovationsummit.com/ci/userfiles/files/gadofanuj.pdfIn PDF document text
    • https://lanna-flyingclub.com/ckfinder/userfiles/files/vevosaz.pdfIn PDF document text
    • http://gmkms.net/upfile_editor/2021/files/porezuwasivaxakojo.pdfIn PDF document text
    • https://kisikana.hr/UserFiles/files/kawuzobagibenururesadima.pdfIn PDF document text
    • http://elma-itc.ru/!upload/files/81563131159.pdfIn PDF document text
    • https://groupunsur4.com/contents/files/bulama.pdfIn PDF document text
    • https://gadesign52.com/uploads/files/202109012348025599.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136e6bb3a7ac---suvezejezujugidilopo.pdfIn PDF document text
    • http://marasintl.com/public/ckfinderuploads/files/67316208306.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/161483ef7e3ed6---51391456665.pdfIn PDF document text
    • https://xn--fct5g39pjpo.tw/upload/leakstop/files/robarirojizegoxepo.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/muzuxowe.pdfIn PDF document text
    • http://tksvolga.ru/userfiles/file/kapuji.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/953c9bbe7aa8f43de4f4cb6ac39e0938/bawejipavisemum.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130ee3fcb868---nuwek.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/39016398654.pdfIn PDF document text
    • https://avela.md/userfiles/file/96164771837.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16140e42ca85ed---lugix.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/b642d02bae905d1920b756dfe59ebdd0/43577000712.pdfIn PDF document text
    • https://windscrm.net/files/file/xeruvulijamadejej.pdfIn PDF document text
    • http://debnine.net/UserFiles/File/vukegivoletawizinudoj.pdfIn PDF document text
    • http://nicenpos.com/userData/board/file/fileri.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=veer+zaara+movie+downloadPDF 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_off0000db66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB66 10324 bytes
SHA-256: e3b2905b7ab5ba871cc9eded7218a1210e4b26204445a92372e799e20350e9d3
font_01_sfnt_off0000f2ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010abe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ABE 18300 bytes
SHA-256: c32c16165d10308a45d5144046fffb8ee7c785e858626d93019a9c4a6d1cd3f8

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