Malicious PDF — malware analysis report

Static analysis result for SHA-256 714f4cb7e97100ef…

MALICIOUS

PDF

111.5 KB Created: 2021-09-24 05:23:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: bc14a83648a76e3323f3eb3210fd7587 SHA-1: b964f6371423d04f4895ede839bf79196e6e5df2 SHA-256: 714f4cb7e97100efdc8a4ea5b59abdaef2d91d8368593e6f0f6e791cf7fc4266
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on compromised WordPress sites or disposable domains, indicating a phishing or link-farming scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 7

  • 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.
  • 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://cructi.ru/uplcv?utm_term=a+court+of+frost+and+starlight+free+pdf PDF link annotation
    • http://all4pets.cz/ckfinder/userfiles/files/83005494360.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d181fa68ab---tijip.pdfIn PDF document text
    • http://ingmontagna.com/userfiles/files/75010629800.pdfIn PDF document text
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/89232481245.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/mopadasulosanopufeba.pdfIn PDF document text
    • http://avatars.ru/userfiles/file/36133906915.pdfIn PDF document text
    • https://lekkermooi.nl/userfiles/file/12086578718.pdfIn PDF document text
    • https://apteka-wratislavia.pl/halatecza/userfiles/file/paguzumupaw.pdfIn PDF document text
    • http://tfforming.ru/d/files/kuxefubopav.pdfIn PDF document text
    • http://moonlightmontessori.com/upload/files/kolixodigedalunifag.pdfIn PDF document text
    • http://stsmcc.org/www/js/ckfinder/userfiles/files/basebubalusafopum.pdfIn PDF document text
    • https://wcfkenzi.com/ckfinder/userfiles/files/7252447411.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/759bc2078c8e67c64bfd27cbbf4dd81d/22840965622.pdfIn PDF document text
    • http://netichikawaya.com/userfiles/file/roloxuvixoketufoxezu.pdfIn PDF document text
    • http://china-hold.com/UploadFile/file/20210921103718370.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/zopalot.pdfIn PDF document text
    • https://lotte-ppta.net/beta/assets/file/vofigusin.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614a18a222192---wesogapipijuzirasiv.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/aa6fc7e00f9128ae6c7f9825eefcabd6/tipejid.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133c8f1bbf8c---7345541626.pdfIn PDF document text
    • http://dharmapuridiocese.com/svnprojects/DHD/Source/images/files/lijovuwugefobikejetixo.pdfIn PDF document text
    • http://thaide.org/userfiles/file/38357265608.pdfIn PDF document text
    • http://b-solutions.net/userfiles/file/10195876722.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16147dafdb2013---98500115415.pdfIn PDF document text
    • https://b2cdemo.tickets.com/content/files/daselowuzufezesexas.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_off00014da7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DA7 10980 bytes
SHA-256: 333a6c237748ae2f34683e2065cd51bb2fe2f1162cb8a802326bf85f2aa95a99
font_01_sfnt_off000166e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x166E8 19308 bytes
SHA-256: 1004b2b39655b8f4e29700ecea04823d047fac22eb42f6b7704bb94e01f57228
font_02_sfnt_off000197ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x197EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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