Malicious PDF — malware analysis report

Static analysis result for SHA-256 c679a97f9038a468…

MALICIOUS

PDF

84.5 KB Created: 2021-09-16 07:49:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 362095da2e456e3625d8ab713fdd0fbb SHA-1: df6fe402b09a7243c3818b14d24548a92f3232ae SHA-256: c679a97f9038a468666f53ed32a3541a78c5e6e13bb511663c795304cc8730db
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised CMS uploads or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support its malicious nature. The embedded JavaScript likely facilitates the redirection to malicious sites or the download of further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://oniceh.ru/uplcv?utm_term=best+android+app+hider PDF link annotation
    • http://opsir.eu/files/file/80194890924.pdfIn PDF document text
    • http://abdon.madteam.net/ckfinder/userfiles/files/pifati.pdfIn PDF document text
    • https://netiko.ge/img/Data/file/jenonimajalagidivos.pdfIn PDF document text
    • https://phunhai.net/upload/files/tazuze.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/dobuzav.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/jqn3ti9u8pb8aq8bd2pohatou0/somovojejivawoxinula.pdfIn PDF document text
    • http://vipnovini.bg/root/f/uploads/files/sebexeluxurokijune.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/91ve57dviosdeg41222hjg5f0c/zuparonopagixa.pdfIn PDF document text
    • https://propactionvehiclesuk.tv/userfiles/files/depisesamutu.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141b6293ca9d---fadimiduzi.pdfIn PDF document text
    • https://i-intelli.com/ckfinder/userfiles/files/47988084517.pdfIn PDF document text
    • http://lianbang123.com/uploads/files/202109061650388617.pdfIn PDF document text
    • http://xn--76-6kca8aqc6c.xn--p1ai/pic/userfile/72546715502.pdfIn PDF document text
    • http://kangshi-you.com/uploads/files/202109161025422356.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161401cfebbb40---kegeriruduxojafi.pdfIn PDF document text
    • https://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/75549607542.pdfIn PDF document text
    • http://opgzvh.hr/upload/file/46375306386.pdfIn PDF document text
    • http://worldnaturalfood.com/image/upload/File/75682497735.pdfIn PDF document text
    • http://moonlightmontessori.com/upload/files/81963021769.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/161335908d4e57---22579074318.pdfIn PDF document text
    • https://reaga.net/js/ckfinder/userfiles/files/zikenuripisow.pdfIn PDF document text
    • http://springgalleryng.com/Images_upload/files/woraxogojoz.pdfIn PDF document text
    • https://zebcom.in/userfiles/file/53284635315.pdfIn PDF document text
    • http://www.azurwelcomeservices.com/userfiles/file/42563919286.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/7057344650.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://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_off0000e845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE845 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001005c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1005C 10496 bytes
SHA-256: 3b67a9eab312fc087ff7aa5a85e7294bacc1bdbd42ff21919ab054df41e6de8d
font_02_sfnt_off0001182b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1182B 18140 bytes
SHA-256: 9a4d82d4b07a85c63331306ca5c8c9a85b9e27fc792a5799957c00fbc315fcdc