Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc11c14d2f53d79d…

MALICIOUS

PDF

85.2 KB Created: 2021-09-16 07:49:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e3f77d04fb9dd112c7ddc8d27b1c5559 SHA-1: d61d6be9812555af1554bf8070a61febb94b8ca9 SHA-256: cc11c14d2f53d79d29d8523b6cbdb743303037d3410323a063fe778e52ad4f57
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and numerous external links, many of which are part of a link farm hosted on disposable or compromised domains. The presence of embedded JavaScript and the link farm structure strongly suggest an attempt to redirect users to malicious sites or download further payloads. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://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_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

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