Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f68141680cfde17…

MALICIOUS

PDF

70.1 KB Created: 2021-09-25 07:57:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e88bdb16b4cf54f79b020bc486669140 SHA-1: 08680b9009819991d500cad534e98348e733fbd5 SHA-256: 8f68141680cfde17aeaec5a1a36703bd0b224bd485999b72b69ed1f18c2cafb2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple links pointing to various domains, many of which appear to be part of a link farm designed to manipulate search engine results or direct users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly indicate a malicious intent to host or link to further malicious content. The ML classifier and ClamAV detection further support the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/wabebaxaji.pdf In PDF document text
    • http://coverybox.box8websites.com/ckfinder/userfiles/files/kedudutonevarulexipazize.pdfIn PDF document text
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/pojalamefasijagadusu.pdfIn PDF document text
    • https://hefcom-hydraulics.com/ckfinder/userfiles/files/vuziturogixixo.pdfIn PDF document text
    • http://shopgraeagle.com/ckeditor/uploads/files/36049107205.pdfIn PDF document text
    • http://hkalc.com/userfiles/56315114212.pdfIn PDF document text
    • http://seanbittinger.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dowiwikutizumiz.pdfIn PDF document text
    • https://mertlakustika.cz/images/pages/file/waxep.pdfIn PDF document text
    • http://jfe.hk/userfiles/wijakewewuzewuvimikokeno.pdfIn PDF document text
    • https://ciela13.leaddeehub.com/userfiles/files/basis.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/votedozelujaxetetamu.pdfIn PDF document text
    • https://qualityroofinnandsuites.com/nbloom/fckuploads/file/40196701794.pdfIn PDF document text
    • https://ispartaprefabrik.com/ckfinder/upload/files/tepegowolisubemasusir.pdfIn PDF document text
    • https://eurouniversal.eu/ckfinder/userfiles/files/bifezamivov.pdfIn PDF document text
    • https://pagodatalk.com/_UploadFile/Images/file/25757899692.pdfIn PDF document text
    • https://biomedchita.ru/imeg_master/file/27304879086.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613712073ce2b---jiditufotafalis.pdfIn PDF document text
    • https://bestcaps99.com/ckfinder/userfiles/files/losufoxetitedolukelew.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614e7771c057d---28075311851.pdfIn PDF document text
    • http://bodemveenweiden.nl/bodem-veenweiden-img/misawubavaseguvu.pdfIn PDF document text
    • http://to-kajihan.net/js/upload/files/dofevegitojixudu.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/f72a6fdf0c2604c1711ef0fb17d19574/sunowaxibikufomojeker.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=hard+reset+your+phonePDF 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_off0000b132.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB132 10556 bytes
SHA-256: 737e8921ac78871c7c72827c9b798782fe4a86091dd3849f0977da43fe724c25
font_01_sfnt_off0000c932.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC932 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE144 16384 bytes
SHA-256: c1581e8f44c7e0f6826fc91c67b421dfea17449aac3bb8661d6b430d04e295d0

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