Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9044c3223ff750d…

MALICIOUS

PDF

77.8 KB Created: 2021-06-26 11:46:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a009669ad57424910ffaadf4f9b9768a SHA-1: cff7d7f13e4deb5f95da56b9863189632d0a7b91 SHA-256: c9044c3223ff750d8ec8df6904a699b2db70c52456dc6e3521faf9eb619a88e0
156 Risk Score

Malware Insights

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

The PDF contains a large number of external URIs and links pointing to compromised WordPress upload storage, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9829

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://huntic.ru/uplcv?utm_term=relocation+diffusion+ap+human+geography
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/e5bbab500ad7f7104719d13dcfec19c1/dutuvasiva.pdf
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609897d21a040---vikixekudakelunuvutiwu.pdf
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16095b560b9b69---wigabit.pdf
    • https://holocaustresearch.pl/nowy/photo/file/mevukulefubi.pdf
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e98d94f15c---81438553027.pdf
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf5c3675cd---fiduker.pdf
    • http://www.benyowsky.com/resources/files/24103860498.pdf
    • https://egf.tw/test2/images/file/28955642683.pdf
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/3b007a9eb950e667f75d192c0a11c877/91741320925.pdf
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071a3ca9f28e---43912522292.pdf
    • http://55pluscommunityspecialist.com/userfiles/files/54555260678.pdf
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/28278463278.pdf
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7adee26a6---37557363225.pdf
    • https://afayl.com/userfiles/file/71786560957.pdf
    • http://riggi.ru/userfiles/file/namusupagan.pdf
    • http://sewakendragroup.com/userfiles/file/pimovimupoden.pdf
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/4f31eea0e176a42eb51e2fdfe890c924/4888710638.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ce6e7c24b6a---givafopepagajezanifib.pdf
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cec0e1e543---kisupuwupesujufotikuxav.pdf
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/85d3co6j1jnq690tmr8g4mhjpd/1127140593.pdf
    • http://bagumul.com/file_upload/spaw_upload/file/20210506063424.pdf
    • https://prairieroseclothiers.com/FCKeditor/file/luzudaliratidar.pdf
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/8c23d6875f06226f2649dcb7a5194e32/9822074095.pdf
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/7571fc706e5726163249f09b5f6a29d6/falopokakuzewiwil.pdf
    • http://angelcabrera.com/FCKfiles/file/sigadefozakeze.pdf
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3ae9edeca---befesekubaju.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cbbe.bin
2e5d4b9be8534ce28e114f30681b5443c18916d7e245658bc0e0fbd163b17d3e
pdf-font-stream PDF embedded font (sfnt) at offset 0xCBBE 11324 bytes
font_01_sfnt_off0000e5fe.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE5FE 16792 bytes
font_02_sfnt_off0000fe10.bin
c8189d3d36c8950d30df4ec1878a5837133a32997d9aad2c0847940f53ce76bf
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE10 16840 bytes