Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9b33202b3ec3d28…

MALICIOUS

PDF

71.9 KB Created: 2021-09-05 08:47:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3f51a13dba7692723dcb9f06af891cea SHA-1: 6acd356bd1491ea4d4590af2c88c62b5b5941219 SHA-256: a9b33202b3ec3d28f3080049fb086ec2e98670a511e9384b20305a5407511615
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • 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://pixomot.ru/uplcv?utm_term=butterball+turkey+fryer+professional+series+manual PDF link annotation
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/37him3rjg724vkobq783jsmfbo/jazawumivakakabipejuge.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/miwolimunajajuve.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6d21ed454b---giziwozibilesek.pdfIn PDF document text
    • http://hkalc.com/userfiles/20829267987.pdfIn PDF document text
    • http://ohsongpharm.com/ckfinder/userfiles/files/22855489356.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e04b2efcbe---vinolorifuturemep.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/72b1977ac5c6e621a00b8c2ccedb6c40/rokosun.pdfIn PDF document text
    • http://daieimotors.com/js/upload/files/xapadedapiwasuteromuzevo.pdfIn PDF document text
    • http://casadiriposomarsala.it/userfiles/files/93336321464.pdfIn PDF document text
    • https://promise-land.com/upload/file/88586866712.pdfIn PDF document text
    • http://winhazel.com/indigo/ckfinder/userfiles/files/debumavorur.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/161066f99dde1c---levekepemojulaxixemurup.pdfIn PDF document text
    • https://pachetedeturism.ro/images/files/37177842198.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe4f0ecdfc---86876232747.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076f3dd68236---giwuzorixenevitap.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/samaxekefavixu.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16097c76761bcc---kiwenobimimez.pdfIn PDF document text
    • https://mimpishio2bet.com/contents/files/20367171911.pdfIn PDF document text
    • https://hssanesteban.cl/files/fizinujuwe.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100a4c68cea7---rasezir.pdfIn PDF document text
    • http://poslovniimenik.net/firme_data/files/fowupuxujogafepojojoj.pdfIn PDF document text
    • http://thevelascofamily.com/clients/11614/File/pazuruxunem.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/e0sjoglukmbj7ri5j0g09fp80r/tesasalirepemapixabavodup.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e110343b92---letubiti.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e750f75f782---bumejaxekojogij.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_off0000b93b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB93B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d14d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD14D 15244 bytes
SHA-256: 8a08e7dc130dc0f9a7fd55c0bbeeb9569e793f7d4b123b50de59c93eb3094832
font_02_sfnt_off0000f805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF805 11016 bytes
SHA-256: 254a2e08cc972eb26a59373a4a62a3f94f5a51160a40ca75d105a3b8bcb3e5e7