Malicious PDF — malware analysis report

Static analysis result for SHA-256 35f8e5e2cdc0f25c…

MALICIOUS

PDF

73.7 KB Created: 2021-09-05 00:57:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 7d845dc2eb4eac7917254fd11f8cb7d2 SHA-1: d99e0e1a25a141052a6379b62f4d03516d029bab SHA-256: 35f8e5e2cdc0f25c48ecb528efbbad331216f3b351793deb4985b9acd1796d7d
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 0.9985

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 http://lighthouseofworship.com/clients/44803/File/89695289557.pdf In PDF document text
    • https://moto-trend.cz/public/files/fck/file/xuzivudipemawik.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9b4143e37---18915484523.pdfIn PDF document text
    • http://kanstm.com/ckupload/files/faximanewefezonekekix.pdfIn PDF document text
    • http://mariancozma.com/_user/file/guzibaraxi.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/84087312006.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/sakidaba.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eda88a1157---fipunobavivinuxagom.pdfPDF link annotation
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/24f76f140b7470744398a5a2f7e3ceed/26205023773.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160884bddc20bf---wawufifi.pdfIn PDF document text
    • http://tomaszfilipczak.pl/userfiles/file/94500440928.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16099b11038cc6---34225448421.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/1431627342.pdfIn PDF document text
    • http://www.clc-engineering.com/siteuploads/editorimg/file/88215634745.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf379592476---dosuseduluzemexegejamesad.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/tetovamelifuxi.pdfIn PDF document text
    • http://dnepropress.net/files/file/73295812761.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608139c808751---vuvalutogupip.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/11373480870.pdfIn PDF document text
    • http://thermogroup.ru/uploads/files/50439873061.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a0006b28f51---82327487442.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=house+rent+receipt+format+download+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_off0000beea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEEA 16048 bytes
SHA-256: 4524d97fc4ed13b13bc2ca2794181e1cc002524a548f1dbc328e0aab3cf6410b
font_01_sfnt_off0000e76f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE76F 10956 bytes
SHA-256: d8e589ebd2e03e697ee433f3fae1171a9e5b6a2d2689032bff0a0941e638593b
font_02_sfnt_off000100e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1