Malicious PDF — malware analysis report

Static analysis result for SHA-256 45c6c2643ad3aef7…

MALICIOUS

PDF

83.6 KB Created: 2021-08-02 17:35:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7c68ce4b7990b056f0f2d7054639df64 SHA-1: 199a034e27869bf3d8fd9830e8b2f83705459098 SHA-256: 45c6c2643ad3aef7d0568eb44764cd64249fab1de58889b19064b4bcf859e606
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, likely intended to redirect users to malicious content. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's part of a phishing campaign, potentially delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • 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://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/rk57h4e2rn7f2hud0rnrqg1d05/62704839438.pdf In PDF document text
    • http://driver-jazda.pl/upload/file/62109412457.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/f05bf4aa03e7a25abccc7d5decd54ceb/12841873706.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/fd0212ee9e08da650a078ea53df9107c/97190640166.pdfIn PDF document text
    • http://dominopark.pl/public/upload/ckfinder//userfiles/files/sokem.pdfIn PDF document text
    • http://rsst77.ru/upload/files/nefawaxegizizazuwogud.pdfIn PDF document text
    • https://elearning-chemistry.ro/userfiles/file/51531416124.pdfIn PDF document text
    • http://portalkucharski.pl/app/webroot/media/files/70904188815.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/edc136251fe18b73a98170266c1c62a1/falujavimoxakigobogoj.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085f1c38fa5e---ruxorokexipovikinezalezi.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160be0f865a56a---sebeporesadaxomabadiv.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160e7c4bef2bf2---84585252844.pdfIn PDF document text
    • http://exima.kr/userData/board/file/6750150936.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/vifovidorugemijepo.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fad2fe0dc04---zusafexaxazew.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6981bcf2b9---93862410917.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/b5f77a50cd6b962f14a1498b5369cab5/74478810989.pdfIn PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/29884062b34a2b7c8edcb3e1981a6331/74126669662.pdfIn PDF document text
    • http://linker-apps.com/files/74180813158.pdfIn PDF document text
    • https://thic.net/plugin/ce1/ckfinder/userfiles/files/sibuwerowegoxemibosezezo.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/8jrn57va2eui3sjdgpself4hic/suwupefodazukilozunila.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=manuel+numerique+sesamath+5emePDF 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_off0000df75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF75 18404 bytes
SHA-256: de28aa0fecdf9b67132e64210bc39b21af78e63abff8b5316dd85eb652e3351e
font_01_sfnt_off00010ddc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DDC 10628 bytes
SHA-256: a93948dcc994d4f0fda62c122331e427c21ee7ad5be45c0cda2739ca3f1d1f92
font_02_sfnt_off000125f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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