Malicious PDF — malware analysis report

Static analysis result for SHA-256 19347b80dcd7c638…

MALICIOUS

PDF

72.5 KB Created: 2021-09-16 15:45:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9d2f646c65b8281b7eeb78da63913a67 SHA-1: 1ae8fcf94b796e6ea522f93ce1a44b175f16cd25 SHA-256: 19347b80dcd7c638a6c3188c5f659274e2cb2d6df91f4f12d5f670da13511c97
204 Risk Score

Malware Insights

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

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and multiple external links, some pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to lure users to download malicious content or phishing pages. The embedded JavaScript likely facilitates the execution of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://huntic.ru/uplcv?utm_term=krisp+app+for+android+download PDF link annotation
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1613117766d8af---jukabemu.pdfIn PDF document text
    • http://floralojistik.com/userfiles/file/lugolalisemisitufusabisid.pdfIn PDF document text
    • http://mannadey.in/FCKeditor/file/42652357685.pdfIn PDF document text
    • http://arredamentoambienti.it/img/file/32994315925.pdfIn PDF document text
    • http://veterinariacasettamattei.it/userfiles/files/jiwukixiwakixenizutugow.pdfIn PDF document text
    • http://tencanpowder.com/d/files/65467078307.pdfIn PDF document text
    • http://hajnysport.cz/FCK_userfiles/file/17888506382.pdfIn PDF document text
    • https://okud-istra.hr/userfiles/file/tudadawakutemekura.pdfIn PDF document text
    • http://www.ville-civaux.fr/admin/js/ckfinder/userfiles/files/sezimakusen.pdfIn PDF document text
    • http://avtokapriz42.ru/userfiles/file/favubuj.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/161330442a0fd4---zibudejulamaz.pdfIn PDF document text
    • http://iseveranscopy.com/upload/editor/file/80726416117.pdfIn PDF document text
    • https://groupburuemas1.com/contents/files/nemotu.pdfIn PDF document text
    • http://careerpathrecruitment.com/swapscan/app/webroot/js/ckfinder/userfiles/files/nupaxowedunodojozigot.pdfIn PDF document text
    • https://ruta.hu/ckfinder/userfiles/files/tinom.pdfIn PDF document text
    • https://horkolas-gatlas.hu/ufiles/file/66747671840.pdfIn PDF document text
    • http://marine-inox.com/i/File/kejuxe.pdfIn PDF document text
    • http://chrisnoblelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zapagomelifutaser.pdfIn PDF document text
    • http://hit-air.pro/ckfinder/userfiles/files/94183410019.pdfIn PDF document text
    • http://abwhopewell.com/uploads/files/63088158309.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/542ca7e53bf131b656b463b34a6e93e5/wabukanelinoku.pdfIn PDF document text
    • https://hinaweb.com/upload/file/komemizowoxibijula.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/p33aqkrh9kp5q8gh20ejl2c754/moledejowadokijowuvegake.pdfIn PDF document text
    • http://clinicaveterinariacittadivignola.com/userfiles/files/dalemekugereduzavuwofek.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_off0000bafe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAFE 16472 bytes
SHA-256: 49b6f1203a5fb137f1c9131756c966a16f40fc3d3192565607b1817a21314585
font_01_sfnt_off0000e505.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE505 10340 bytes
SHA-256: 868eae833df6b3d7a42c1542729091077f3c4b53b51f5b8c82efe5b76e1fef82
font_02_sfnt_off0000fc73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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