Malicious PDF — malware analysis report

Static analysis result for SHA-256 d56ca7c6b88cac03…

MALICIOUS

PDF

82.4 KB Created: 2021-09-08 06:45:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4489835af58e1caa25ae3279fb7ee71a SHA-1: b426d12dc0100bce911046e6a79a32909fce2eff SHA-256: d56ca7c6b88cac03467f25a1cfd92acfd17991c86923ea2646749e9e5a9cbbbc
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised websites and disposable hosting, indicating an attempt to redirect users to malicious content. The presence of these links suggests the document's primary purpose is to facilitate initial access via spearphishing, leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • 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
  • 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 http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af859cceee7---sogeda.pdf In PDF document text
    • https://iringmalaysia.com/ckfinder/userfiles/files/zuzuluneji.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070b2e9348ff---gumibixosi.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/5f05a36f5f0072692bc39d36d239b8c0/musowilubip.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/gukebusejoxonuj.pdfIn PDF document text
    • https://www.gurkhasfinance.com.np/ckfinder/userfiles/files/nejifipapigudobedizef.pdfIn PDF document text
    • http://z-him.ru/userfiles/file/xugijan.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/0a25971a02f38c14500e2c49a09f89b3/zowirujo.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/52949821245.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/hidl84g3scehc40ucvl312q530/46802375645.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/44636560964.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/wibesadinakevarilexin.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/cdbe7334786471cd38a7ef3566be8541/zowelimexisigi.pdfIn PDF document text
    • http://ash-graphy.com/userfiles/file/10025100309.pdfIn PDF document text
    • http://movitecnic.fr/ressource/site-image/files/57718670020.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f781b4d3bb---xiweno.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16111f765d10e7---rowepafojarepukaj.pdfIn PDF document text
    • http://marasintl.com/public/ckfinderuploads/files/zixunasivi.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/sukonekupasixew.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612d001add4ff---35759066285.pdfIn PDF document text
    • https://lentes123.com/aym_image/files/34793841347.pdfIn PDF document text
    • http://nova-auto.com/upload/37625895365.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612059e154a35---kidajuvixale.pdfIn PDF document text
    • http://qiuyutv.com/userfiles/files/20210528054631.pdfIn PDF document text
    • https://www.cylinder96.ru/admin/ckfinder/userfiles/files/sefajowinegugejile.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=protocol+oriented+programming+swift+pdfPDF link annotation
    • http://e1pl2.nazwa.pl/busy/fotki/file/25394349961.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_off0000db6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f37f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF37F 18156 bytes
SHA-256: fa4836d8b20a3437201aea3a51ade6d947dee79a5b392f0581b1e85991c9b612
font_02_sfnt_off000121ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121EF 11048 bytes
SHA-256: f9ccd592db1682a756cc2cc442a57ffd98db3ebbbc9d18a9db546bd1930f352a

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