Malicious PDF — malware analysis report

Static analysis result for SHA-256 3873d642ca3a3ff6…

MALICIOUS

PDF

89.8 KB Created: 2021-07-29 22:56:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c3b9939eccc9351e4a13589cd6d9f025 SHA-1: 9d459d4bfb70b73a59bfa539c1a3855e8f9f177c SHA-256: 3873d642ca3a3ff689dc6c5f307c15b133b761b5702e5ab171df95c8874f7b68
172 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript and numerous external links, some pointing to compromised WordPress sites, suggesting it's part of a phishing or malware distribution campaign. The presence of a 'download button' lure further supports this, indicating an attempt to trick users into downloading a malicious payload. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://krisoc.ru/uplcv?utm_term=handwriting+calligraphy+font+practice+sheet PDF link annotation
    • https://daleel.global/wp-content/plugins/super-forms/uploads/php/files/uklsl0e59muguntiko64eg3lsj/luderiridivinitifi.pdfIn PDF document text
    • https://footballsod.com/images/ck-uploads/files/80173694075.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/88b943a87131de39bab1a504f8bfb1eb/bubujawuxuveteduwolo.pdfIn PDF document text
    • https://mszukam.pl/dat//file/voterapojibunewiza.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/46740112686.pdfIn PDF document text
    • http://sonnenheizungen.ch/fckeditor/editor/images/file/28369227265.pdfIn PDF document text
    • https://annekienlen.fr/imagesfile/dotononogotetawukakenen.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160984532839c6---5322545159.pdfIn PDF document text
    • http://cathyourhair.nl/js/ckfinder/userfiles/files/15559704640.pdfIn PDF document text
    • http://studiolauramoschini.it/userfiles/files/vixewibuxologejunafudovi.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16091fdc19af9d---30921884041.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/ghv0celeejavmm534346cb0i76/19754061174.pdfIn PDF document text
    • http://dorp.pl/userfiles/files/lofojoneripuju.pdfIn PDF document text
    • https://onelineservice.it/file/mesinanutibibis.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/1nr5t2stillbnc1dujsqg6q47j/26245038005.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ce0284cc60a---14982875920.pdfIn PDF document text
    • https://bdaudit.ro/userfiles/file/vusixadavadiziw.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/7577d94fce45e06290932fe5f1b6a3f2/fukiberevok.pdfIn PDF document text
    • http://worthingtonpark101.com/userimages/17180157135.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607368f169b05---boden.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160acb76deea39---68686027022.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f313fa157fc---mofabupidibinezalasigo.pdfIn PDF document text
    • http://landia-print.com/pdir/file/88540011264.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/42126710687.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_off0000f7a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A8 11092 bytes
SHA-256: 0fa322c862563583962668e04e970e54778ab88cb684bd5b57016d7ce2e39bca
font_01_sfnt_off00011142.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11142 17864 bytes
SHA-256: 28704f913104f82ff5265a39270f99c2ea63f2875275d5ee6ce1c2b6912a6507
font_02_sfnt_off0001406a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1406A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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