Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e3c724013cc882d…

MALICIOUS

PDF

81.0 KB Created: 2021-09-05 04:46:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 97bb84d3e20ef517370b709771599cb1 SHA-1: e409470a1c3862877eeb744af5035f8a0e072c82 SHA-256: 6e3c724013cc882d8cecac24d6bca82745c59076bfccb51a0a0b4f9c7e547259
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm to distribute further malicious content or phish users. The embedded JavaScript is likely used to facilitate the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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.
  • 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://eurekaelearning.com/upload/news/file/bejuperoda.pdf In PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c967e995d97---zuvesupuzogonanakew.pdfIn PDF document text
    • http://vwtint.com/userData/board/file/xomomiva.pdfIn PDF document text
    • http://mebco.ru/images/file/3972399773.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/ece29c6f86846fa59ab78335bce9ae61/50265010637.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160a376d9682d2---19498952398.pdfIn PDF document text
    • http://computergramm.com/userfiles/file/13717094122.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a3698acb67c---68753054448.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607831e0cf879---risizofenow.pdfIn PDF document text
    • https://birudongker.com/contents/files/derozegibura.pdfIn PDF document text
    • http://mariamozharova.ru/uploads/files/56576176214.pdfIn PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/gibuvagoperatirid.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b96e0c0423b---beref.pdfIn PDF document text
    • http://autoscuolapezzano.it/userfiles/files/resugawesedososevitinuted.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/jilakunuzegidezakid.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/s4rru0p227aud64feanoov4je3/8229125431.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/40954b428d5eefd157f6b0f369d093ae/watofexixadusu.pdfIn PDF document text
    • http://jeansresource.com/js/ckfinder/userfiles/files/kumodaxujerate.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/jevokabe.pdfIn PDF document text
    • https://bloomeng.com/uploads/72282184336.pdfIn PDF document text
    • https://smartmedia.ro/app/webroot/files/userfiles/files/ribinipi.pdfIn PDF document text
    • http://ncabhsa.com/clients/875427/File/lefozizu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=feudalismo+historia+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_off0000d630.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD630 10736 bytes
SHA-256: 30de08227536484fae8a36662f0ca24559dd1ee6437a3759130b084fcea5b758
font_01_sfnt_off0000eed2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED2 18744 bytes
SHA-256: 91051ba4f7bad3c02e3177658d5ef9eef47cc790fbbc17a5fde55d29fce99ff7
font_02_sfnt_off00011e93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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