Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0822180745e7d06…

MALICIOUS

PDF

73.2 KB Created: 2021-07-04 14:45:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 44709ddcafa3f290da273ebb334892db SHA-1: 2cf75121a32be17a92a1973dabbac09f81cd7616 SHA-256: f0822180745e7d06cc44c21e9761b604211ab05660bdf09ed94ec92cdc3035be
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a link farm pointing to multiple compromised WordPress sites, likely intended to host malicious payloads. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically a phishing or trojan distribution scheme. Although no scripts were directly extracted, the structure and URL patterns are consistent with a malicious document designed to lure users to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/g65vaoatrjq6alam54bjf1h51q/didiberudetagupa.pdf In PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607f761474062---58973951317.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/66736422854.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160928c3d7208a---gememurexomojav.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021061500425773499.pdfIn PDF document text
    • http://kiavysocina.cz/UserFiles/File/texuxifem.pdfIn PDF document text
    • https://nevisnews.com/userfiles/77780595700.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/perefurosomakagitofa.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/tq4mg1np5j1ko4j7ote0pbk28o/sejefasiparuramer.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/11319036949.pdfIn PDF document text
    • http://firegallery.ru/img/upload/50073971519.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/0g5fb1fsruaee1aukpqp5cpgc5/puwawijima.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607866747e11f---30171889150.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/7159005102.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b1666b9c27d---99951973105.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/75734ba408030b7d637023398bc47181/92024110160.pdfIn PDF document text
    • https://bnbcostaverde.it/userfiles/file/64743387964.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/26cce29bb86d1e3b3d57942226a79c9d/lopazofixezewosepebomik.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec8ea60db0---xatowuwarupulazutefuwuza.pdfIn PDF document text
    • https://dietacud.eu/upload/file/watesutigijidegesekapofo.pdfIn PDF document text
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/dcc89345eb647c3f37c5387c324659c2/wumisimo.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609d18942cf48---numuwebozonoxatiri.pdfIn PDF document text
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/656fd40565a47ee56873cacd6eca789c/63701467545.pdfIn PDF document text
    • http://gagutp.com/sa_upload/userfiles/file/20210513225536.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=what+word+becomes+shorter+by+adding+2+lettersPDF link annotation
    • 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_off0000bbf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d40d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD40D 11268 bytes
SHA-256: 634ee8ed9cbbcfe8c6cede6b185adc6d55bb0dc64e98832fa26b826c1c7865c3
font_02_sfnt_off0000ee3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3B 16080 bytes
SHA-256: 2c02d7ad2b4e8dfc0b07ea1beb303a53c79087d1637b81f20c0e48f1681fa404

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