Malicious PDF — malware analysis report

Static analysis result for SHA-256 53f7be000cc16ce6…

MALICIOUS

PDF

63.9 KB Created: 2021-05-25 08:00:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 326a3eefd9f773ec8170b76050a4b3c9 SHA-1: c743b0dd8e78de8bccf34d647c8e8e7b56a612d6 SHA-256: 53f7be000cc16ce604cb24e36a7f3077fc939005ac3060dd924ea63b951e59a1
154 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically a phishing or trojan distribution campaign. The document body, though partially garbled, suggests a lure related to file conversion, which is a common tactic to disguise malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9172

Heuristics 5

  • 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.
  • 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://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/33u8dekut2hjq157ene7nvfqi3/25541877887.pdf
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071ef10bb1e3---bebomojozola.pdf
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/458dfc5cdf15efeafa62d1977ce9b18c/3330452561.pdf
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0a55a70b7---bogasupimakigovimixadokap.pdf
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/9d2766b6b5ff8b80fd6f1366c1249162/4734486273.pdf
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/esleces96fk0d74nd9ioj560k6/53530396222.pdf
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609de20fc32a8---rurosorun.pdf
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/gtud2e3rbao8dg67o6c75o69nr/sanaxujaxufipa.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1bitoa84agoqug9t6l83pnlp57/kitoleful.pdf
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/ee9ec7c0d1fd850e819245fdb5372bc7/92475514088.pdf
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/4fcf99ca1e9dc23024ceb46a169ae0ab/44270980323.pdf
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609d1a696c520---73836067432.pdf
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609f8c86e68c4---72055217223.pdf
    • http://ekolojikweb.net/upld/userfiles/file/fapubugoze.pdf
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/d96gsfrnsm4esdnumvs08hjq2r/koxojizimekuwekezofuk.pdf
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/49d3092fddfeca90086fb7afb0b40c3f/7446028565.pdf
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160aa18b5521b9---golagus.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+convert+chinese+pdf+into+english
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf9c.bin
5bc68db44b97bd0d19caea74c1d478b4f5ac4dba1d75637f05c497fff342bead		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF9C 5320 bytes
font_01_sfnt_off0000e1d5.bin
e032df6daec04d67acdc7ae762fb8c4bbe3507f3974f51ef4d6dbcc090942a50		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D5 10708 bytes

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