Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3601c5a1ebac92f…

MALICIOUS

PDF

83.3 KB Created: 2021-09-02 02:18:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 051d6faae8b375bc65a54d1e542b022f SHA-1: f94d8c26ab2564a877bdfc825a7afe5d8807dc68 SHA-256: c3601c5a1ebac92f374434f78a17242ffea35761892aed4e9d398ae6c0d519c5
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many pointing to compromised CMS upload directories, suggesting it functions as a link farm. The presence of these links indicates an attempt to redirect users to potentially malicious content or phishing sites. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e08e323abb---3204068449.pdf In PDF document text
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/30151903985.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608146aec1cd3---76188241656.pdfIn PDF document text
    • https://noursportevents.com/wheelmarine/userfiles/file/8710038110.pdfIn PDF document text
    • http://sanarina-coaching.de/ckfinder/userfiles/files/49016082627.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093f77651e89---57299037004.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/qjso1dg6cmudiov2p7jq0eqb0v/61489492790.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/wagope.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d553c20d507---kudodedipunejebututa.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/a636d702e4244e6dc82d8709060d46c6/88794247934.pdfIn PDF document text
    • http://koyomisushi.com/uploads/files/87508162506.pdfIn PDF document text
    • http://pro-group.ru/userfiles/file/61813689252.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abf8d5e41be---48934831291.pdfPDF link annotation
    • http://xn--2-140-swe8h.xn--p1ai/files/nugutejixutebaka.pdfIn PDF document text
    • https://mbzl-pro.xyz/web/img/podborky/files/sagovonorumetawojeluju.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/c473e41342900e6aaf2ae07fdb054a2f/wuxerolutidumosiwanipi.pdfIn PDF document text
    • http://alltechsro.cz/files/futuzigajurafowoda.pdfIn PDF document text
    • http://aldobini.it/userfiles/files/tunadepabu.pdfIn PDF document text
    • http://xiaohecollege.com/d/files/bukewepiborejubewonole.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16082740530442---joribawediwog.pdfIn PDF document text
    • http://business-baltic.com/myfiles/dok/32631560822.pdfIn PDF document text
    • https://datawire.gr/files/files/jolupegetetoritebitiri.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/78aaac3d5ef97b8b80746f127745af2c/fenobigutezugotaf.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609c4f9a9a840---getifazusepetowijon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=watch+before+sunrise+online+freePDF 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_off0000dfb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB7 10664 bytes
SHA-256: 0c0c5a987d7ea822e556492728f8dae37e464cec504188c5fa9adefb0e66a8a3
font_01_sfnt_off0000f824.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF824 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11036 18068 bytes
SHA-256: 669f57ffa1969f32c6f1e3cc47c7ba44b2abb8b9c252aa062c460d1b30c468b6