Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf624e8ff4899735…

MALICIOUS

PDF

88.6 KB Created: 2021-08-02 05:50:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 1c380c184293ab193a481fc91b5e2fb5 SHA-1: 7252d7d0e1835c05a452c318b991945d073a14fe SHA-256: cf624e8ff4899735ecc0d11da327cd30cb9b178c57010f66fbc7d22d01108fef
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF sample was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. The primary purpose appears to be directing users to phishing or potentially malicious content via these embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://nomylo.ru/uplcv?utm_term=bluestacks+2+1gb+ram+download PDF link annotation
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160926d2ad8310---83217273551.pdfIn PDF document text
    • http://ghrnightinwhite.com/clients/7/72/721f26fb9237119891afe8d29dbdfc29/File/51354156759.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/jiitbr7oiuhivggda181hdlkii/puwivizilizafetivoferego.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0868b8ae7a---27587596009.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c093668c736---faxel.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16081d42aa4c26---vosojezusorimuxezij.pdfIn PDF document text
    • http://accronline.com/userfiles/file/22911938693.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bda56c3a20---26650844897.pdfIn PDF document text
    • http://merwepizza.com/upload/file/geluvovegimuverodoguva.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/f62de136b0a8524a0bcb58efb9f27d74/62474633808.pdfIn PDF document text
    • http://dekogard.net/deko/veri/_files/88224713737.pdfIn PDF document text
    • http://kingsauto-bar.com/js/upload/files/23415936503.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/xugokutimomutom.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a6aa9998608---47945169323.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/3ff4511df17e1597baeddd9013d9eeee/difepeduma.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0fae867d19---18562064885.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/18530993209.pdfIn PDF document text
    • https://institut-arabe.org/ckfinder/userfiles/files/90648190359.pdfIn PDF document text
    • http://cityhigh78.com/clients/2/2d/2ddbae4fb74c169819b3574d76e4e264/File/55673160196.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/s2r6r7n8ts3jpkg59ptjm8c168/31053593911.pdfIn PDF document text
    • http://chiron-ventures.com/chiron/home/img/upload/files/2107151517379138512pmc2.pdfIn PDF document text
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/ef895ff5009faf62e21cdf625da94f83/97760361008.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010237.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10237 11264 bytes
SHA-256: 6483800afe6dfd48220c8676a71023f6642a9511f6b3e60b9508c887e3efdd86
font_02_sfnt_off00011cb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CB4 22508 bytes
SHA-256: 07825be80b9a4d63381bf1b24f5cc6e16e3f9c65182cf550e87382ab89213eb1

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