Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8693ef30d500c79…

MALICIOUS

PDF

66.7 KB Created: 2021-04-29 07:53:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 58731aa62ac05cd58d7bf63bf87e1e55 SHA-1: 074fc8dcf5b87617190495bb3f3066412cd735f6 SHA-256: b8693ef30d500c79cad15da92e9dd44b3ae34f896a0f235adb11ab617cea40e8
154 Risk Score

Malware Insights

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

The PDF contains multiple links to external websites, many hosted on compromised CMS platforms, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The presence of multiple compromised upload links points to a coordinated effort to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9751

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 https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/f1533ff08100653606bea96ba395f807/28052163985.pdf
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/72e3e416edc6aebe5d4c91beea57c1dd/dudinoginavemexo.pdf
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081c17998271---jifageki.pdf
    • https://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072e2376295e---20257135822.pdf
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16082738b2970c---vujeliseja.pdf
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/6224fa524e60927c6d053572355d53fc/38845214185.pdf
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086c24c60012---kigivosowik.pdf
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607037c119d9a---54583072559.pdf
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/8702eda9c154583b3f0a563958deaea0/wagesijobekikop.pdf
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f487b622b6---9980058200.pdf
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16083d39e6f430---gegilusonitex.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/b0bd5ca9ff66b86428b7e587524991be/bofosewewetamo.pdf
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/bfc8fd46aee540f659b6ab57f69d4b1c/18810083985.pdf
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/230d72d227138dfcaea8f78b57f29f67/37464044396.pdf
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081662cebf3a---12965265441.pdf
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607216c5c590c---22134164654.pdf
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bbd54d7262---noxupelone.pdf
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/6jfo2s5qbum9e12f31366rnlps/55326386074.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=boerse.+to+filme+en
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef14.bin
3ee037e91503d2900c3217226845f67e0bbf079ae7f9ba09e4fccbffd51011a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF14 4572 bytes

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