Malicious PDF — malware analysis report

Static analysis result for SHA-256 3819d41fc337b2d2…

MALICIOUS

PDF

98.3 KB Created: 2021-06-25 09:50:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 50decab56272348e56cdc8fe0c126ac8 SHA-1: 454ae63e6d031095a91535ac19d8e3ac6a6ee0b8 SHA-256: 3819d41fc337b2d2b2d7bf5231e272b9a813d07178f057f6db79f5419b659556
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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.
  • 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://inwebjor.ru/uplcv?utm_term=czochralski+process+pdf PDF link annotation
    • http://ray-king67reunion.com/clients/41562/File/79177557573.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080c80df2bd2---fuwojatetofomirerirebatot.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c91b0470ec---filubanonisemivogipoku.pdfIn PDF document text
    • http://mpti.ru/userfiles/file/90740469524.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16084970d0aae1---482223613.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/a3301d9268f42912fa130e2abf235dd1/93701203158.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4a31c4b7c---vadezozadagupunasuje.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef4cb8ce07---56975134870.pdfIn PDF document text
    • http://rainbowcaterers.in/userfiles/file/14777532561.pdfIn PDF document text
    • http://jvcc.cn/ckfinder/userfiles/files/210619231825719970158a9.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/6b56ce46857828bdca09fa1787aad7bb/4823474707.pdfIn PDF document text
    • http://topas.lt/userfiles/file/pevabana.pdfIn PDF document text
    • http://rhondachem.com/d/files/63294677667.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/87da5e49d9c48ff69eba9fffc8484846/72031177238.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f323.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF323 20452 bytes
SHA-256: 9e6ea6e5525e19b0e0f065cf53dda5e4c0b07f3aef627632362f808e2148abbf
font_01_sfnt_off00012e2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E2B 5264 bytes
SHA-256: 539ae51d570812561201f9b9ab02988af31c91bd8cd0ef29104d573628b2983b
font_02_sfnt_off00014012.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14012 11620 bytes
SHA-256: 1dc1afdd79a5ede7cecef9e672794c70dac8734399b2c3c53706f246b843af2a
font_03_sfnt_off00016766.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16766 16036 bytes
SHA-256: 9559dd1bd908241551916101fda3d445a26f5c4b506a1423f23393456f9d5940