Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce10ddd7d4647a54…

MALICIOUS

PDF

69.2 KB Created: 2021-09-08 18:31:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: 54bffc682d8894a60ef5fa9de8d01507 SHA-1: 1468828b814465e21d0c0c15d1b97c455fd52a5c SHA-256: ce10ddd7d4647a5483f2916cfe9614934358d1a8109f83356534b8feb7bac0c6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution scheme. The presence of external URI heuristics and link farm patterns further supports this attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://huntic.ru/uplcv?utm_term=insanity+meal+plan+pdf PDF link annotation
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136206fbeb87---maruzefonezerufigegibe.pdfIn PDF document text
    • http://lamexmarket.com/uploads/files/39899443476.pdfIn PDF document text
    • http://tasteofruraleurope.eu/upload/File/38844293715.pdfIn PDF document text
    • http://sbstroy53.ru/img/files/xetipodabu.pdfIn PDF document text
    • http://studioturina.com/userfiles/files/wajapolutaxelexovoz.pdfIn PDF document text
    • https://jesssmithtri.com/jesssmith/ckfinder/userfiles/files/joxogemosi.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/161349b8ed4339---90132376097.pdfIn PDF document text
    • https://omprintandpack.com/userfiles/file/zuduni.pdfIn PDF document text
    • https://produktybhp.pl/pliki_user/File/tevonanaz.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/26599368896.pdfIn PDF document text
    • https://matagujrischool.com/admin/imagetemp1/file/31909396126.pdfIn PDF document text
    • http://xn--brneneskontor-landsforening-b0c.dk/userfiles/file/65108133558.pdfIn PDF document text
    • http://flairpens.ru/uploads/file/84654334343.pdfIn PDF document text
    • https://alebusph.centralcms.cloud/galeria/files/25182785129.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613184c07cf8c---14486731123.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/tesetamapuk.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/d0065acef071d78299e197a8e1e892fd/57952558938.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16132460c05db7---bigufefekarofobiwagiso.pdfIn PDF document text
    • https://ever-progress.com/upload/files/wolomatetefudutixeb.pdfIn PDF document text
    • http://indcms.testingmachines.com/images/file/74800750418.pdfIn PDF document text
    • http://sarkar.ie/userfiles/file/movezusuzarejozubaxoso.pdfIn PDF document text
    • http://www.detskaoptika.cz/ckfinder/userfiles/files/28370481001.pdfIn PDF document text
    • http://gdgom.com/upload/file/210906112238200159yt0uhnn09kpt.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_off0000b37c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB37C 14316 bytes
SHA-256: 36db6623e99e778beadda44c0bbc0bca475bff50c1a21ee2af664a81eb129b09
font_01_sfnt_off0000d741.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD741 10504 bytes
SHA-256: 6236395d584f8190ff29e9ef3c993cbe0354a8dc050f96345ea903d31a04f7ad
font_02_sfnt_off0000ef24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1