Malicious PDF — malware analysis report

Static analysis result for SHA-256 c02b41976d09c9af…

MALICIOUS

PDF

68.8 KB Created: 2021-06-13 23:36:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 860c31bc932ca0769d128932d60db07f SHA-1: 5978a017ca6f720688f75c6208c654453a88a9f4 SHA-256: c02b41976d09c9af4bdc47bc350054416f29b327ef9a4d1276f7d31062a7149e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, appears to mimic search result content to deceive users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://philabc.ru/uplcv?utm_term=symmetry+worksheets+grade+4+pdf PDF link annotation
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079f68f85081---2294351014.pdfIn PDF document text
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/vafazagofumenomazonatiwo.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/b1711345b8983a5feea09b6cac354613/kivorozevakozapoduw.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160700ff2a1cee---17212565582.pdfIn PDF document text
    • http://laclonghotel.vn/upload/files/fasoj.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae329bdc3c---rakamu.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/nuzagisenasonom.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1f182f260---46583180033.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b5183922c---2177732924.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/6888f8c767d7bc5a514f0bccea873891/wutimunokamisatekodo.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/gevilesemudomotopugubon.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8202614a4---95189736824.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/a1f003e75b3faf4ba565e99e384b9370/zeponifarowomivuke.pdfIn PDF document text
    • https://bikeid.net/ckfinder/userfiles/files/47479934422.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/4j961hngfsre1e0i517hb40n45/17682678857.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/dj2kj5qah29dplu4qbajgac4ng/jojowidukoravogenofevukir.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/4417127174904cb66c5a1da7aa4711be/70889982571.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/gndolcp0s4nb3kij413slj8ot1/74166795473.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cfbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFBB 5872 bytes
SHA-256: f478720239fb068105fde894c2585bb4fae0101c5a8240691513a13c094a1108
font_01_sfnt_off0000e3af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3AF 10128 bytes
SHA-256: 71ba25140d209c1790f5d59ad905d503ec60e0a61db1995ee3cf0a2cc2f40f82