Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ebd6119de9c1c98…

MALICIOUS

PDF

87.2 KB Created: 2021-07-14 04:02:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 363cc5aec6224e9d5f745ccf22f0735f SHA-1: 03eca0d590ee54dafa90e298fc4c072e0b3a4c4d SHA-256: 3ebd6119de9c1c986a16cf11757c6e04fc5910937b618bc5ce6e8ac062c720c3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Numerous heuristics indicate the document functions as a link farm, with many embedded URLs pointing to potentially compromised WordPress sites and disposable hosting. These links are likely intended to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://philabc.ru/uplcv?utm_term=how+do+you+craft+a+trapped+chest+in+minecraft PDF link annotation
    • https://scanclean.bg/upload/ckfinder/files/60708541864.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb7ac28c4e---xusolepuvakisopidabuw.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160746c55bd327---42049741334.pdfIn PDF document text
    • https://fullprotec.com/ckfinder/userfiles/files/povixelemaxafekozukakogej.pdfIn PDF document text
    • https://energooptima.hu/upload/File/62651625890.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1608d23f384cc4---puwakozipel.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a56048eb2b---napagajaxolikodefar.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/bexudin.pdfIn PDF document text
    • http://mobiliteit.nu/files/zesabubibirefitogotuk.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/9f137ff64ec23a523beb50afa1bb11f9/tojiliku.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac687747c95---30511719230.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/62b147b40147a4b9fbed57c9f9743429/sikapukeruk.pdfIn PDF document text
    • http://computergramm.com/userfiles/file/wawejokuku.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607163079be84---wozokezenudibe.pdfIn PDF document text
    • http://notarbrazda.cz/userfiles/file/8397003039.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/da96de98cfa895fbea42b54de33fd59e/gurikemoropupobe.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/a190f73bd17cc77b35948953ca8187ff/9461513584.pdfIn PDF document text
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/kmvnum2qb35nvljr0ahv2t3l83/99414313542.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/42361598661.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098ea0d5ed41---kokopefifisuz.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/rf6v89dkk7509ipna2a72hobef/40454039803.pdfIn PDF document text
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/97095105995.pdfIn PDF document text
    • https://marigabung.com/contents//files/70667056051.pdfIn PDF document text
    • http://www.tramag.pl/upload/file/liduzadapolodulames.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_off0000ee6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010685.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10685 11132 bytes
SHA-256: 04f9f9f8d12d97c4aee60511bc887de6713393dce110e11fc10a8405ac6825b6
font_02_sfnt_off00012057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12057 17724 bytes
SHA-256: d44285737e6e59541198c0ebe4b0cf12b64b035784848a0ed85853b6d77890eb

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