Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cd3e3296db9865c…

MALICIOUS

PDF

82.9 KB Created: 2021-09-02 07:29:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 946261ee3b53022d2fb36a6a3c29a84e SHA-1: 7b71cc5136958dfacd7982da7002d9ebe61fbed4 SHA-256: 8cd3e3296db9865cfdc210b30c1a0ce6e0c2685138148993b850544aec3bf44a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many pointing to compromised or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery. The embedded JavaScript is a common technique to execute malicious code or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://www.wemservice.com/ckfinder/userfiles/files/koratejogudemigodu.pdf In PDF document text
    • http://bangtaisay.com/uploads/userfiles/file/8407403452.pdfIn PDF document text
    • http://restaurant-lyons.fr/userfiles/file/83440880702.pdfIn PDF document text
    • https://seltec.io/images/uploads/files/61617078655.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/bk0dqqa0ie5ovj2n5f4lb1thph/dusamoxovopimoserofefufa.pdfIn PDF document text
    • https://digireg.si/upload/70313219563.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/227f6606239828ff073fc8bcba8412ea/segapuxowupan.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///pigararojumapemowemulip.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3debf1de7---47008120234.pdfIn PDF document text
    • http://bjjiffy.com/upload/75334719533.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc9e98669e8---jazijon.pdfIn PDF document text
    • http://jmdfhjl.com/fckeditor/userimages/file/miver.pdfIn PDF document text
    • http://www.aunay-sous-auneau.fr/ckfinder/userfiles/files/4456473413.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/wugaka.pdfIn PDF document text
    • http://merwepizza.com/upload/file/94738360480.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160b87c3b1521b---49128054552.pdfIn PDF document text
    • http://woodsfamilypride.org/clients/2/2c/2c83419adcf4927d74d3defe18342386/File/jovoxokenad.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/valebunos.pdfIn PDF document text
    • https://ooobelkom.ru/ckfinder/userfiles/files/40620086189.pdfIn PDF document text
    • http://carnow.jp/js/upload/files/62087815401.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/631102db517d4555badd8b9dd5e25d09/puwufowazokixolipewenovut.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097c7e8487aa---vunufonadijokofipomitoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=definition+of+inculpatePDF 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_off0000d1ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1AD 22804 bytes
SHA-256: bb4876178714a82e4fe351b3842f6c05e1278b56e23e8dc8eab8e1bebd556029
font_01_sfnt_off00010d3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D3B 10308 bytes
SHA-256: 7c181fa580af1fbc9ea30c8ff47574055ad0f6554e3adc36ae98b11e8a4430d6
font_02_sfnt_off00012497.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12497 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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