Malicious PDF — malware analysis report

Static analysis result for SHA-256 787639a82c958027…

MALICIOUS

PDF

88.5 KB Created: 2021-06-29 04:33:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 267c230fdaa63bdfa8bed741fddb0edb SHA-1: 0be41042e549b5ef2dcc78d414a2918bf6d5025d SHA-256: 787639a82c9580274a28f7584a40bc52941eac4d23a6906a525675d5cc1a37f4
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The file's structure and the presence of multiple external URIs indicate it is likely a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/8r81v5kbqu8bt05mu5nr2p0t44/botapevogajibaf.pdf In PDF document text
    • http://ecolservizinettuno.com/userfiles/files/loduvowevux.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf801a48bb---91165442574.pdfIn PDF document text
    • http://maekuangudomthara.com/ckfinder/userfiles/files/89196431622.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae6918d155e---59711687625.pdfIn PDF document text
    • http://meandnetworking.com/ckfinder/userfiles/files/679288867.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/t01tmccb2orrb9oj6kihjiuoce/dofelad.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/a207876ac9baa555e3bb29c95f2e9026/11118451971.pdfIn PDF document text
    • http://nenkin-t.com/upload_img/ck/files/84244619790.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606c825501fb9---ketudasizoporizuwigisilex.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/sernr1ncsejo4t35of1l5t3ria/30407725647.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/60426243478.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/jajokozusatukadepowik.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a86659ad1b2---40764113838.pdfIn PDF document text
    • https://clinicscrm.com/img/files/93771164079.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/4d6a997b3d2901ca6dfa0c167563a256/rulereriregixez.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e13055596---rexiserinewalefojana.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd87a517690---movajaperajotofavav.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6b7b3b32d---vuwidugowo.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a584a736bb5---45900487623.pdfIn PDF document text
    • http://cuanhomkinhtoanthang.com/media/file/44189294232.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/9l09s99qecpo301sifki5137m0/61618704092.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160965aac064ad---11433661535.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/5e3qqbe9laqi8hotl550daqkt6/11711157763.pdfIn PDF document text
    • https://dolmalatrek.com/userfiles/file/54924767567.pdfIn PDF document text
    • http://the-bom.kr/upfile/files/fuxituzeki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=convert+multiple+files+to+one+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_off0000f6c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C2 10692 bytes
SHA-256: 52c8d774f3b5daade96fd4a53f36a1e7c60b32235a7ea1c1fd3a4a5728ed2a5f
font_01_sfnt_off00010f46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F46 17280 bytes
SHA-256: 9946dc9babf714780e05bcc4ef3dce22b87f67da24d24e937a4e9176bec183af
font_02_sfnt_off00013c4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1