Malicious PDF — malware analysis report

Static analysis result for SHA-256 966920029cf5855c…

MALICIOUS

PDF

83.1 KB Created: 2021-09-11 09:00:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 884f45c30fde0d1d2cf039ca9183ddd5 SHA-1: 7d55e7c61767ab266c7da0f475927031fc8f899d SHA-256: 966920029cf5855c5f1e9b99a4cf371c3332951771b9fc74a106bd3d55cc91a2
176 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' heuristics, along with the 'SE_ENABLE_LURE' firing, indicate malicious intent. The presence of external URIs and link farms points towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • 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://smidgel.ru/uplcv?utm_term=ad+blocker+for+chrome+phone PDF link annotation
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137757b32edb---2748687732.pdfIn PDF document text
    • http://zae.me/datafiles/file/padobemovufipa.pdfIn PDF document text
    • http://shopabrang.com/images/files/13421573711.pdfIn PDF document text
    • http://highlevel.pl/userfiles/file/79226310090.pdfIn PDF document text
    • https://usssecuritate.ro/userfiles/file/14074449456.pdfIn PDF document text
    • https://certifiedcollisionrepair.com/home/cert/public_html/ckfinder/userfiles/files/3556310945.pdfIn PDF document text
    • http://paradisoseminatrici.it/userfiles/files/jenaminipoposubokifepa.pdfIn PDF document text
    • http://tiendanatacion.com/noticias/files/mowadise.pdfIn PDF document text
    • http://j-club.eu/userfiles/file/5270979546.pdfIn PDF document text
    • https://aromamarketing.md/img/files/rekisof.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/99734153610.pdfIn PDF document text
    • https://gruntbudowa.pl/files/file/71662367785.pdfIn PDF document text
    • https://suativisamsungtaihanoi.net/upload/files/menokekododofiz.pdfIn PDF document text
    • http://studioguagnoni.it/userfiles/files/namirebomavomitixera.pdfIn PDF document text
    • https://recapress.com/ckfinder/userfiles/files/50684631195.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/161320cd605dc5---laferaxalotiro.pdfIn PDF document text
    • http://ohmytour.kr/FileData/ckfinder/files/20210909_16949B9C9186DD13.pdfIn PDF document text
    • https://impulsa.mantareys.net/uploads/plantillas/files/gepogibowiropuwat.pdfIn PDF document text
    • http://dc-42351dc5a6b3.prshots.es/uploads/userfiles/1630590486/files/neviwov.pdfIn PDF document text
    • http://xn--9n2bn9mz3aba29g44r4o0a.kr/fckeditor/userfiles/image/gewuwuviwigofodapuna.pdfIn PDF document text
    • http://decorstore.eu/upload/file/wikifot.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/89812332099.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613207fca7fca---85958242560.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_off0000e1bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1BD 17608 bytes
SHA-256: 4bbb5cf50b23708c22a5eda3d77a01a57c0e48ea99dead16aa57859df539fe14
font_01_sfnt_off00010f35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F35 10580 bytes
SHA-256: 1be1ce8fca57da9fa13ba13f2ad3eb0d202ceeb19a51d7bbf783e09b478a831e
font_02_sfnt_off000126e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1