Malicious PDF — malware analysis report

Static analysis result for SHA-256 6517a8bc98b4dd76…

MALICIOUS

PDF

83.6 KB Created: 2021-08-01 03:53:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 72e264cefb7ba9a8962af2ea79c88dfa SHA-1: 9ceb8a07c86e18bc5a339c09722204d7d0f8d3df SHA-256: 6517a8bc98b4dd7629e952076a3d6de1af059d8c41ac7496fff0fc51906745fe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many pointing to compromised WordPress upload directories, suggesting a link farm or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://clubsecurite.fr/webroot/upload/files/nururesetati.pdf In PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072ac2bcf355---pukakenojidikojixovesufa.pdfIn PDF document text
    • http://donghotam.com/luutru/files/8784941384.pdfIn PDF document text
    • http://biosite.ru/images/news/file/92389689291.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16086adb99cf8e---92269962040.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16079d6be8dc58---rikewowizefafenavapo.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608b390637649---20091418308.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/jtpk2p9ug9ic5lujjtbcl1lvt8/24207140334.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/l3b9tobsd00u8k88lujdvvd3db/sijetizamibuwiwewuzedalos.pdfIn PDF document text
    • http://novosib-sport.ru/ckfinder/userfiles/files/kosofexiparonuwogegun.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/arfv6aaitldjpn45sso16707pb/lubukonixol.pdfIn PDF document text
    • https://x-software.cz/data/file/7150512429.pdfIn PDF document text
    • http://redeyeldn.com/userfiles/file/godinaragudemalufa.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607782c571b7e---zadunifogerijanevejoku.pdfIn PDF document text
    • http://anipetkingdom.com/webroot/img/files/32944842633.pdfIn PDF document text
    • http://biancoacolori.it/userfiles/files/30694831277.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/qm3iugnsopnvto8kif3al5p9ee/39255559718.pdfIn PDF document text
    • http://nutricion-intravenosa.com/wp-content/plugins/super-forms/uploads/php/files/df0f3b13e9cdd4e0f50c4bfe60603cc9/lolipoxanasejo.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021510220527926.pdfIn PDF document text
    • https://study4student.com/cache/fck_files/file/49907180403.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/9ee96bc351b059f6619be19a392b5f49/70345377006.pdfIn PDF document text
    • http://konyaozgunmobilya.com/userfiles/file/72963748887.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f1483567209---1883211514.pdfIn PDF document text
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607296c7bc1ad---48657951694.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=how+to+load+pellets+into+760+pumpmasterPDF 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_off0000df95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A7 17612 bytes
SHA-256: f3a0eba0bb59829d4aef17126c37db5e4c03ce317f8ec918203cea7f611b23c8
font_02_sfnt_off000125d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125D7 11072 bytes
SHA-256: 37bc1940ed63caa33769291da2e9b00a8fd6956490180bfce25894c1eaa2971a