Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba892930f65eb293…

MALICIOUS

PDF

95.0 KB Created: 2021-08-10 17:16:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a67aaac2b6f0eac8e918d1cb7d16b350 SHA-1: e26c22745c26cbc4a2cd09b85b9f090a662a1cca SHA-256: ba892930f65eb2934b4b842cdf5e1d96f754cb8fc7cef49d96741416881cbdcc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised WordPress sites, which in turn host other PDF files. This structure suggests a link farm designed to redirect users to malicious content, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160824dc6338a2---rawagi.pdf In PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ab2745ab38b---68096941350.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/f5ed089d9c848752262402858f0d370c/beviboge.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ad168884c---noxirezepodaxadis.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bf5c2fdb999---12197796419.pdfIn PDF document text
    • http://novosib-sport.ru/ckfinder/userfiles/files/kedaka.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16089688561f88---jewuxes.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/wufavavuwinilal.pdfIn PDF document text
    • https://couvreur-hautdoubs.fr/internet_new/images_et_fichiers//file/bixavixarosotidigopuno.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a153a08522e---87567581974.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160851b81e31e4---nebasupefowufum.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/zomiwodojatakilutojovawe.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16074d1ddaf02f---15417741293.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/tavabe.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/85313639633.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/6dc1faa31600bab5d064cf110696e475/876099748.pdfIn PDF document text
    • http://scheidenschiedam.nl/uploads//file/lekedixax.pdfIn PDF document text
    • http://helloshoppingnepal.com/userfiles/file/38144193039.pdfIn PDF document text
    • http://heyibnb.com/CKEdit/upload/files/84101272463.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607584056e166---lebopenepewutizovisit.pdfIn PDF document text
    • http://ristoranteibucanieri.it/userfiles/files/88246138754.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/4cf823423821575eac5ae6e41c5724cf/74269071710.pdfIn PDF document text
    • https://jamurgoreng.net/contents//files/47490585176.pdfIn PDF document text
    • http://thanhtindesign.vn/uploads/image/files/veluteza.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607917ed671cb---20850880194.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=at+nal%C4%B1+el+sanatlar%C4%B1+zanaat+malzemeleriPDF 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_off00010f99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F99 18528 bytes
SHA-256: 858c5546fe13db3182ec8b7ec44f0447a4a7252e561147c67261320734ea4429
font_01_sfnt_off00013c5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015475.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15475 10236 bytes
SHA-256: 08e912e975c2714511bfefda21e5f5e2bcf3c541e75fa81861cb6a1fd7415a65