Malicious PDF — malware analysis report

Static analysis result for SHA-256 11cf845f426b64df…

MALICIOUS

PDF

63.8 KB Created: 2021-05-01 15:54:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 29c1a8a16d919ecd9826998500e49b2a SHA-1: 88a0a02a676d3cc4c85b408c567223fcb18fef5d SHA-256: 11cf845f426b64dfbe9ac30fcf03692396f3d3a6fca4680837295fe4d88c0bd7
154 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, a common technique for distributing malicious content or phishing lures. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classifiers also flagged it as malicious. The embedded URLs suggest an attempt to redirect users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9147

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://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160886ed05a79a---nopetaxe.pdf
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/o2cc71g5mhrlklhdsrbkgn54qc/1673240222.pdf
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/16070e291823dc---rimosomufeg.pdf
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/8dd414e01f518f8f1769175faac85caf/76063708886.pdf
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4d66bbe6c---96861707126.pdf
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d379b7cc98---kepalo.pdf
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/c897ee7fb7d23d803c25e6ca7f9e72c6/vixotexo.pdf
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/scc8ab9mlvq2d8odemk5nctjfo/62364694601.pdf
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/92b2f99bda53a04bd94220872a88cf47/bevixifab.pdf
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070ee33ac14b---40669336372.pdf
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607e09159213d---tibitituzek.pdf
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9099ecdff---wirepelidi.pdf
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160831659d5922---fapemirujojezefi.pdf
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16079018f8cfe5---17866058281.pdf
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16088787450df1---pojoviwu.pdf
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca16f6b260---52741349178.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=best+songs.+pk+apkpure
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df3a.bin
627e6d375f92fa7fb8e4889f1cff82bbe98accc4fb1b0ee17c90c6c825924ccc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF3A 4452 bytes
font_01_sfnt_off0000ef03.bin
8cacd4392ac3cb737ba676c69f111039cb4a4cca51827c2ba55c123850dfa752		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF03 5100 bytes

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