Malicious PDF — malware analysis report

Static analysis result for SHA-256 e31116fad17afed7…

MALICIOUS

PDF

69.5 KB Created: 2021-09-29 14:29:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 6ad4b8641e6f09708619afb30e4188ab SHA-1: 928012827cdbd08330066eed787fb055ebd0f399 SHA-256: e31116fad17afed7965347b67cc1d70d9f3e029732915da3b3cbe84967f6de36
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. Several heuristics indicate the presence of link farms and compromised upload storage, suggesting an attempt to redirect users to malicious content or download additional payloads. ClamAV detection and ML classification strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • 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 http://didaconcept.com/admin/fckeditor/file/89785780212.pdf In PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/pisazijotezuribewovoka.pdfIn PDF document text
    • http://morard-mcf.fr/data/Files/tejuvibon.pdfIn PDF document text
    • http://www.bash.cl/media/file/fozilineteva.pdfIn PDF document text
    • http://hokkaido-love87.com/app/webroot/js/ckfinder/userfiles/files/kukuzixotutopoka.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/34680462143.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/92918791610.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/sinidagusajogogusaz.pdfIn PDF document text
    • http://yavuzselimvakfi.org/resimler/site/files/topexamuled.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/09f404bb05327785c9186da09df18cee/taselo.pdfIn PDF document text
    • http://kiapelhrimov.cz/UserFiles/File/gizaderusujupexagenewe.pdfIn PDF document text
    • https://ceccarmehedinti.ro/userfiles/file/lawobimapawidirudof.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d51c93c6d2---xubajujax.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/b2cc62060576db835e8ee9b350f89cd2/12860049824.pdfIn PDF document text
    • http://achwvs.love-mrt.com/upload/files/bexebopejojuju.pdfIn PDF document text
    • http://globalbando.com/DATA/upload/files/202109210953509684.pdfIn PDF document text
    • http://projecthouse.bg/uploads/CKfinder/files/kesejo.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/g6ubob6h1o5jihtec88rvvd3h3/91121270217.pdfIn PDF document text
    • http://crmloccitanecr.com/campannas/file/xegikesegujirawut.pdfIn PDF document text
    • https://naveenent.com/administrator/imagetemp/file/42966451004.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/ludavulowugaterezolegoz.pdfIn PDF document text
    • https://gionggiacam.com/ckfinder/userfiles/files/xabelufit.pdfIn PDF document text
    • http://myredm.ru/uploads/file/kidogikidenanenofe.pdfIn PDF document text
    • https://divinescience.in/userfiles/file/niliwajowaxesafufuxaliwu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=warrior+cats+a+shadow+in+riverclan+pdfPDF link annotation
    • 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_off0000b1a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1A2 10860 bytes
SHA-256: 7df6afbb85f636cb5ea8f2c73eb5463c8523abb8ef972749c159efd3821339d7
font_01_sfnt_off0000cab8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAB8 14852 bytes
SHA-256: bd4501466c4df0088eb2797a6bd53d28689a1167f6e330ae88be2503c660c939
font_02_sfnt_off0000f01c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF01C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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