Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0a10a4cba7c8912…

MALICIOUS

PDF

82.0 KB Created: 2021-09-02 17:16:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6883f2f98ceb9b98584a88e82bd67bed SHA-1: 89f46df2b36f69e6e85487d704efeb585772e5f0 SHA-256: c0a10a4cba7c8912a91c3d26c5a6d11abe268a453215f70aa4a9ceb7e431f25b
156 Risk Score

Malware Insights

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

The PDF file contains a link farm directing users to numerous external URLs, with several pointing to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://akicgiyim.com/userfiles/file/difekamutog.pdf In PDF document text
    • https://swagath.co/new/ckfinder/userfiles/files/tijalunutosorisik.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be969124851---40877695195.pdfIn PDF document text
    • https://ayurvedaemart.com/uploads/file/92621762027.pdfIn PDF document text
    • https://seedomoretravel.com/files/files/9612050510.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/k9elhhkioob12mqed7kuir850n/bedomoxubar.pdfIn PDF document text
    • http://poslovniimenik.net/firme_data/files/feveguzatovenanevesajel.pdfIn PDF document text
    • http://bmsorganica.com/userfiles/file/73201574812.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1609c391b14c18---mojuf.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/675c78c4881970fbcb017408bfb7c8e1/25448812652.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc148a6f68e---filufezojekutufavukuga.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d00b05ac3ea---79862924155.pdfIn PDF document text
    • http://kup-vino.cz/web/ckfinder/userfiles/files/97417699009.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a0867477f66---matawijepolaxeduzewitori.pdfIn PDF document text
    • http://thienthaopc.com/upload/FCK/file/xasibarisogawove.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16091fb7aa8091---12860853514.pdfIn PDF document text
    • http://airmon.hu/images/files/86482866236.pdfIn PDF document text
    • http://gandolfiarchitetti.com/userfiles/files/dozukazepebuxasiki.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/05f81ab6140efc53173ece02c7478265/48134096821.pdfIn PDF document text
    • http://kozelskadm.ru/files/uploads/files/74156191872.pdfIn PDF document text
    • https://betenagro.com/sites/default/files/file/67191376477.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/c777b46ce247d0ca459f8a76783483a6/senanajagokiretivag.pdfIn PDF document text
    • https://adikkeempat.com/contents/files/tajalazijatuwanevobo.pdfIn PDF document text
    • http://skolky.info/foto/images/file/82850186557.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/4aujgc7q1noknts76ir4hm3vga/31763670028.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=tercer+par+craneal+pdfPDF 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_off0000dec2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC2 10100 bytes
SHA-256: 62eccd4f1edaf818da2c342ac05c1c38611a041924ad95ff9c8097a4d298536b
font_01_sfnt_off0000f555.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF555 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D67 17828 bytes
SHA-256: b1a2929fc9feb48895721b6e5fde19af0e9e6aead97dc6089c93af8863ae0ed5

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