Malicious PDF — malware analysis report

Static analysis result for SHA-256 26571200ed62821b…

MALICIOUS

PDF

79.0 KB Created: 2021-04-28 03:03:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0001e792be87e67cc88a8d0b2a884017 SHA-1: 891501e2477fda7e93d6fd07780efa995c58d2d6 SHA-256: 26571200ed62821be674b2c96dfe0183b9bda8d74e3ce1e51a99ba90f01a1b51
154 Risk Score

Malware Insights

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

The PDF document contains multiple links pointing to compromised WordPress sites, indicating a link farm designed to obscure the final destination. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The presence of numerous links on potentially compromised infrastructure points to an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8211

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 https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16084e82ae5538---tasanonemutoz.pdf
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606efb06e3a8b---xidegixikakagim.pdf
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/ffc61409066a4e854044983644abea96/64238844913.pdf
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/dpq553otnq4a3gt4qniu7n0q2q/darexavojesigepikipok.pdf
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/5c6112d8ba36988df52213d84ede1440/14900241694.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/i2ed50tofmbd772p62idvnemr0/rorizejerod.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/47cb98kcvkl4dqfso3050dp312/37573998311.pdf
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/3gj7p7qrnfpn1no81ii7n9na0b/nomomuvajirevokolife.pdf
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607cab7577996---34858284411.pdf
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607433d447ea1---tepavurupoxalad.pdf
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084939ca6dbe---budadasefifusogoj.pdf
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607a267669235---81536361108.pdf
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/g65vaoatrjq6alam54bjf1h51q/didiberudetagupa.pdf
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607788d201947---80393152989.pdf
    • https://pensiuneavlasin.ro/wp-content/plugins/super-forms/uploads/php/files/4lf9b16s7409lu58df7tuut2ui/16515288794.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=compound+subject+and+predicate+worksheets+answers

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012bf6.bin
b2bdb25d444498b9eac69dd75984c0cd0b37288b77f0ccbbef0f13a65445a2a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12BF6 4276 bytes

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