Malicious PDF — malware analysis report

Static analysis result for SHA-256 c05290f9520e5e61…

MALICIOUS

PDF

73.0 KB Created: 2021-09-08 03:58:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0e5ccb08a238d4ad97560c8b3f50c111 SHA-1: 42185001ea9d740e5405e130e7013dfd2662b819 SHA-256: c05290f9520e5e61b979f6462e0410fb1b82494b106256a2a5f048e96335638c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The presence of embedded JavaScript, flagged by heuristics, suggests potential malicious scripting to facilitate these redirects or further payload delivery. ClamAV detection and ML classification strongly support the malicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://oniceh.ru/uplcv?utm_term=garden+city+movement+pdf PDF link annotation
    • http://valeneighbors.com/userimages/folepewalatokipisulopaz.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/70b70cd3644fcf43b31688ce1d98f250/13864264287.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d798715324---xanosebisitoruto.pdfIn PDF document text
    • http://conservativista.com/js/ckfinder/userfiles/files/45986535088.pdfIn PDF document text
    • http://computer-rudolstadt.de/upload/file/86283612621.pdfIn PDF document text
    • https://angkaganjil.com/contents//files/guforexibukebugij.pdfIn PDF document text
    • https://m-astar.com/UserFiles/files/pavefuzalozisomatavix.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/16078b978454b9---vexazaberogatalelatapo.pdfIn PDF document text
    • http://gwardiajuvenia.pl/zdjecia/fck/file/20417469284.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaeb3d72bea---luporepotozilifudiva.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609b52fe207d2---83032979971.pdfIn PDF document text
    • http://ebrinteractive.com/userfiles/file/95277387491.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/vexelulusarefuxinipikerug.pdfIn PDF document text
    • http://vividconcept.in/userfiles/file/94976563557.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16100ef09f39d9---jigalo.pdfIn PDF document text
    • http://surmounttravel.com/userfiles/files/4399533156.pdfIn PDF document text
    • https://clubsportedinburgh.org/userfiles/files/54530406388.pdfIn PDF document text
    • http://uitetenindex.nl/images/uploads/fekewesufelekorujijasozu.pdfIn PDF document text
    • https://discovercefalu.it/_data/images/file/84351091039.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a37e59b09ac---madegiseluzekakivozonij.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/870fve40917o8fcjbvro8201n7/77741151829.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/83auef672vb4ksu432ol081o08/93287840550.pdfIn PDF document text
    • http://khonggianmang.com/upload/files/wogudaz.pdfIn PDF document text
    • http://cableesmaltado.com/d/files/64459962483.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_off0000b990.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB990 10784 bytes
SHA-256: 7afd14c3630672aa4e5982779c4c156d922001f3bd5de7cf0253d2402105ca80
font_01_sfnt_off0000d270.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD270 17520 bytes
SHA-256: 75fe7683340c0e3005d98791995367dbb86df59f1ac74f4c5f14ccae5da951d0
font_02_sfnt_off0000fec4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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