Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9af5b8f91bf8e26…

MALICIOUS

PDF

78.5 KB Created: 2021-09-12 09:11:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2756074455a5c0f9d68dbd5473b58de4 SHA-1: c9821530930548bf25afda0e5511262b59cd8f88 SHA-256: b9af5b8f91bf8e26c7c6343a99a2a12fbad64b59840e894e3c7f6db14aaded2b
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous links pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or initiating malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • 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://houstoncoinclub.org/FCKeditor/file/xuwolizodoxizet.pdf In PDF document text
    • http://reclameindex.nl/images/uploads/tefiworamejezok.pdfIn PDF document text
    • https://devcons.org/uploads/userfiles/files/86952827002.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/73ddef542f8de49e7b363b6dcbbdd9c7/xuvepoduvorakufavijuk.pdfIn PDF document text
    • http://istihdamhaberleri.com/upload/ckfinder/files/84313864933.pdfIn PDF document text
    • http://makesrealsense.com/ckfinder/userfiles/files/zamumuxedinutoniv.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613c647e2aa19---pimevunusojepukolav.pdfIn PDF document text
    • https://www.nstoplana.rs/ckfinder/userfiles/files/wadaledirigesuwudeg.pdfIn PDF document text
    • http://ewtch.com/upload/files/kagiwudujakazekozusupuge.pdfIn PDF document text
    • http://diagnosticaedilizia.com/userfiles/files/guvejaxo.pdfIn PDF document text
    • https://amadesafar.ir/basefile/amadesafarir/files/kafojubigawizemavi.pdfIn PDF document text
    • http://ipayon.com/root/FCKeditor/file/68882500094.pdfIn PDF document text
    • http://gongotour.com/FileData/ckfinder/files/20210905_A6DFA9EFA8EEFA37.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16132c4bb03900---12568079891.pdfIn PDF document text
    • http://dirpub.org/editor/ckfinder/userfiles/files/rovaso.pdfIn PDF document text
    • https://cambodiaangkorhomestay.com/userfiles/file/71743589103.pdfIn PDF document text
    • https://dabanbep.tanglehadong.com/upload/files/fajubetip.pdfIn PDF document text
    • http://vinczeandlaszlo.com/upload/82543777849.pdfIn PDF document text
    • https://www.greenlakecruises.com/ckfinder/userfiles/files/bezurufogotava.pdfIn PDF document text
    • http://1137.jp/app/webroot/js/ckfinder/userfiles/files/jogivasemawedap.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/luwavafasojevovuzowov.pdfIn PDF document text
    • http://presssimayeshahr.ir/pic/file/6405285495.pdfIn PDF document text
    • http://evergreendentistryva.com/app/webroot/js/ckfinder/userfiles/files/64926432930.pdfIn PDF document text
    • https://shriayurvednagpur.org/public/ckfinder/userfiles/files/30178320745.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=kirby+ds+romsPDF 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_off0000cdcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDCD 18496 bytes
SHA-256: fcfc48b2a1f8e457160fdda6913ff9faab79d7926883f7fba6c8cdd40f8a2e8b
font_01_sfnt_off0000fdf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011608.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11608 10112 bytes
SHA-256: d0c16b37d55f3d27d004f4acfa4ebf1a87bf44dca3deb610a36bf757056a0ddd

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