Malicious PDF — malware analysis report

Static analysis result for SHA-256 7639b40d106f8028…

MALICIOUS

PDF

63.6 KB Created: 2021-05-16 19:00:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bda62da1af5209b9d3357d207b85a94a SHA-1: 93981bf7d71219385317c2ff77127a7a32c02dae SHA-256: 7639b40d106f8028929df8cd2fa0d9253032e432e3960bfb60441a955ad6187a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF contains numerous links pointing to compromised WordPress upload directories, indicating a link farm designed to host and distribute malicious files. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL findings are sufficient to infer the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8201

Heuristics 5

  • 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
  • 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://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16082cf195df90---33525180260.pdf
    • https://harkakotony.hu/UserFiles/file/libuvarosumanupojugunojo.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e0fa05349c---6198984994.pdf
    • http://kursadowicz.pl/Upload/file/wegirunakisado.pdf
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/fc7270eb7be375204c4e703402cf7267/zapimetagokufalokazubo.pdf
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16084e4162f7d7---razizilujokifakopetig.pdf
    • https://loctra.net/userfiles/file/baxofanan.pdf
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/e2a42920qrsv4r797uh39igeq8/zugajo.pdf
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad87a45374---72589326602.pdf
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609913901a3ae---salexujupukakiwaxupat.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8ce9204ce---79680784192.pdf
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/98d8337310d2abb46cf274bc5f822c90/47487379642.pdf
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16075c70713fce---46425600261.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/8a1h4d4kf02kc69ab9mu9o1cuj/59748506539.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=boomkin+pve+guide+3.+3.+5
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d505.bin
95c2f9f8cf007842b05eaced0faa3faaa2cf8bc2b528fa6ba73c3a5031e8f09d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD505 5256 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.