Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff4945f122aa8fff…

MALICIOUS

PDF

96.3 KB Created: 2021-08-08 05:10:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: eb7fc60ef8349c88c0e7a4e74656e0b0 SHA-1: 914b0cc47daa4cbd28f9ec327dea32ec75eddc0c SHA-256: ff4945f122aa8fff89940b0e18cae6fd74b7937880146484949b6090d73a2735
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with exploitation techniques that could lead to client-side execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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://inwebjor.ru/uplcv?utm_term=brooklyn+nine+nine+characters+zodiac+signs PDF link annotation
    • http://murasakijr.com/uploads/files/63150519510.pdfIn PDF document text
    • http://ersenergy.com/UserFiles/file/66615749774.pdfIn PDF document text
    • http://hoangduy.vn/vn/files/16637418499.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/6560c35396f045163bc399253c02c55b/wimipijenowatoropeti.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093a8ee7e462---48613801146.pdfIn PDF document text
    • https://study4student.com/cache/fck_files/file/momemavonik.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/a88aa01cb2a126f7afd99fa66ad013ac/setemakoleka.pdfIn PDF document text
    • https://clubforeducation.com/FCKeditor/userfiles/file/sawelirelusovikusija.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/wenavevagetax.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/046d4bc254f37b27879e378095962d06/darodomedadovoj.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d556da49f1---18663984511.pdfIn PDF document text
    • https://kitapkapla.com/upload/ckfinder/files/47483447272.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/bd1ee62dbd49c360449c355316a38f1f/temoxezovomuwetadejopi.pdfIn PDF document text
    • https://timjanen.se/anvandarbilder/53/files/fiwokivafotawe.pdfIn PDF document text
    • https://alutat.com/data/file/25641090225.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/976v7d5cukme3nb10a5997l8j7/67018595821.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160fc21717045e---lesafivo.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab4b0adb90---31206334878.pdfIn PDF document text
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608826fd426b3---1422431554.pdfIn PDF document text
    • http://myappartement.de/web/editor/files/54479566849.pdfIn PDF document text
    • http://enidbtwcreunion.com/clients/5/52/52e94d62e82ff66504c7d921fc07bf70/File/ridesitiganupipebe.pdfIn PDF document text
    • http://epmachine.ru/d/files/17200542425.pdfIn PDF document text
    • https://ajansnigde.com/resimler/files/69767987000.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/ckfinder/userfiles/files/73720655070.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_off000113cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113CC 17240 bytes
SHA-256: bbf29507f2d113be50cf156253b5b8d027cbd599fd52e343c7cb982ebc6b154a
font_01_sfnt_off00014089.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14089 10968 bytes
SHA-256: c44a455ec952e49e7ed1877be80a3949f61aacf3e974e790957b220b97e86313
font_02_sfnt_off000159d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.