Malicious PDF — malware analysis report

Static analysis result for SHA-256 91f212b18f1923fc…

MALICIOUS

PDF

74.0 KB Created: 2021-09-23 14:29:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ab5038aeffa106dc6bfd7f5f2ec73f01 SHA-1: bcde5550caa8dc0b7381a4e39707569becd870a4 SHA-256: 91f212b18f1923fc33b1efef893244eaea3c210f0331a32a0e882b387eff6f49
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload directories. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicate a deliberate attempt to create a network of links on disposable or compromised hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://pistant.ru/uplcv?utm_term=my+hero+academia+dub+episode+3 PDF link annotation
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613c3421c4a8f---33115661565.pdfIn PDF document text
    • http://ks-system.co.uk/ckfinder/userfiles/files/wekipaxevurapita.pdfIn PDF document text
    • http://floridare.ru/app/webroot/img/uploads/file/291409_62885809956.pdfIn PDF document text
    • https://koratspring.com/upload/file/dolorekow.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613adfea9b625---detegudapiborad.pdfIn PDF document text
    • http://w3-japan.com/js/upload/files/xowofunalupe.pdfIn PDF document text
    • http://faceconnects.com/ci/userfiles/files/sewixajobivipalokil.pdfIn PDF document text
    • http://adfaveo.com/image/files/20210921_205843.pdfIn PDF document text
    • https://www.newhorizonscrisiscenter.org/ckfinder/userfiles/files/vopadorajibobekitove.pdfIn PDF document text
    • http://djk-winkel.de/images/uploads/file/vedoxegebaripimixagufuf.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/472fb276f27a286410734c1c6ecdcbb3/rizanoxumaveziserexa.pdfIn PDF document text
    • http://dioblina.eu/userfiles/file/4664116775.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613d3831d0cbe---jiliputuborupu.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b1450dff0a---dufojukoxuvefunu.pdfIn PDF document text
    • https://htchninc.com/d/files/namejo.pdfIn PDF document text
    • http://poddertradingandindustries.com/userfiles/file/84074158278.pdfIn PDF document text
    • http://jainfarms.com/uploads/22680994329.pdfIn PDF document text
    • http://norilsk.torbay.ru/images/uploads/file/wefavomutifedegop.pdfIn PDF document text
    • http://www.scea.edu.mn/ckfinder/userfiles/files/tarebakamol.pdfIn PDF document text
    • https://alertsecurity.in/ckfinder/userfiles/files/20627587732.pdfIn PDF document text
    • https://fleuriste79.fr/ckfinder/userfiles/files/22041364919.pdfIn PDF document text
    • http://klhl.com/userfiles/file/piwiziruradir.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/52d349b91932b28dfd8e394eacffadd8/24318328476.pdfIn PDF document text
    • http://ulrike-mayer.de/userfiles/files/bemojozutobad.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_off0000bc5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d474.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD474 11052 bytes
SHA-256: 916750a8f8bee5a7cdb08d1ea85255f1da0d11639a1957d0307716b3749a60d6
font_02_sfnt_off0000edf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF7 17048 bytes
SHA-256: bc7c481ae1ffb85397a7fa484ce0b0bbb370ace2326216c962bf9ddc126f16fd

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