Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8dd87d0d37d059b…

MALICIOUS

PDF

73.2 KB Created: 2021-09-10 19:22:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b6b2193121cf15d9f8c1c4e31b113a66 SHA-1: 5cfec5a5ac8a7435112a39e1e18e44bf1e6af73c SHA-256: b8dd87d0d37d059b0f01880810067494d725f8333016d9fd918b3ec1c3f684c5
164 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories and disposable hosting, suggesting a link farm designed to obscure malicious destinations. ClamAV detection and ML classification strongly indicate malicious intent. The presence of a 'download' button lure further supports a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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.
  • 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 http://www.yevres.fr/ckfinder/userfiles/files/36721556904.pdf In PDF document text
    • http://sweet-sugar.de/images/uploadedimages/file/84119941692.pdfIn PDF document text
    • http://www.salac.cz/ckfinder/userfiles/files/gitanoded.pdfIn PDF document text
    • http://sushimura1.com/uploads/files/90664710359.pdfIn PDF document text
    • http://spy-military-labs.com/userfiles/file/gijuxu.pdfIn PDF document text
    • https://barrier.exma.cl/ckfinder/userfiles/files/fiwuvija.pdfIn PDF document text
    • https://diphong.com/uploads/norivifuzoliredaro.pdfIn PDF document text
    • https://ntct-dz.com/ckfinder/userfiles/files/keduzuzul.pdfIn PDF document text
    • http://ed-union05.ru/files/file/39836344032.pdfIn PDF document text
    • http://ck-buhgalter.ru/userfiles/file/rekem.pdfIn PDF document text
    • https://varbackaforskola.se/ckfinder/userfiles/files/37810287949.pdfIn PDF document text
    • https://euronuts2009.ge/files/files/fosometuduvolanoxixifi.pdfIn PDF document text
    • http://stavebnevyrobky.sk/www/upload/files/48488351601.pdfIn PDF document text
    • http://allier-genealogie.org/File:/vexabida.pdfIn PDF document text
    • http://turhantur.com/turhantur/files/zimoba.pdfIn PDF document text
    • https://gkscam.com/userfiles/file/78944993409.pdfIn PDF document text
    • http://jcnjl.com/userfiles/files/85877991714.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef47d86afd---94038602431.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b12f81679c---18187021098.pdfIn PDF document text
    • https://sysyanginguvenlik.com/uploads/files/dakeporoda.pdfIn PDF document text
    • http://chinhlytailieuluutru.com/media/ftp/file/64261362958.pdfIn PDF document text
    • http://slovbau.sk/test/userfiles/file/miwed.pdfIn PDF document text
    • http://thedreams.cz/files/77115166964.pdfIn PDF document text
    • http://dokumsuzgec.com/userfiles/files/jobulugusi.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/161353de080ee5---xepijimukijap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=garena+contra+modPDF 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_off0000bbec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d403.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD403 10264 bytes
SHA-256: e762af4bb21c969925f440fc274d0d8fc994211efc8d3213f6f99782745e6c0f
font_02_sfnt_off0000eb17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB17 17080 bytes
SHA-256: 3a8b9b672f4707189bea81d43542314cc2895ec6f59774888bdcea7045c20e56

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