Malicious PDF — malware analysis report

Static analysis result for SHA-256 77dbbe06837390bd…

MALICIOUS

PDF

76.1 KB Created: 2021-08-19 15:08:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c27fc19af7c7ff0392519b7f4e95aa76 SHA-1: a48eaca736283a72ad618ba4a4845aacfda7d57c SHA-256: 77dbbe06837390bd8fcee2d3e405285acf812f04da6600ccb0e1dc135a3e77dc
156 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple distinct hosts hosting PDF files within form-craft or super-forms plugin upload directories further supports this. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16096c79d81b98---tuderozorokutazeri.pdf In PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/f1c331d00d0d791e9e29366e6e80c7db/71609937780.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/ketcso5gf7cj7hkc73mtl1ir3b/45730231443.pdfIn PDF document text
    • http://beautifulmoda.com/userfiles/files/fuwinosunupow.pdfIn PDF document text
    • http://marmaraisg.com/images_upload/files/nukefimij.pdfIn PDF document text
    • http://dharmapremipariwar.org/userfiles/file/86698439048.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/oebjmmr4p36s6b4abe3ctdikq3/24888870533.pdfIn PDF document text
    • https://emauto.lv/index/images/up/file/79574330733.pdfIn PDF document text
    • https://lochoanggia.com/upload/files/56468736802.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16098c0085bf8c---nipatajufukamabawos.pdfIn PDF document text
    • https://takipcisec.com/calisma2/files/uploads/jazawogu.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ced63c36af---86515843143.pdfIn PDF document text
    • http://abyss.sk/userfiles/file/kexosagixiwawibu.pdfIn PDF document text
    • http://tulsamemorialclass1969.com/clients/8/8b/8b8b36ecbaf17f244e47af75a29dfbe2/File/jufuxakudaligefojeg.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608008e1c0e55---tobidomupaborizerur.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/f8mf909mprqj2fbeda8cjl7800/jodezoxilo.pdfIn PDF document text
    • https://chp-travel.ir/data/file/28355905739.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a355651631f---wolilatukogub.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/voxojetesuwutoz.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/9ea12139128kbfm7juk7rnpd81/83953348773.pdfIn PDF document text
    • https://suprizpin.com/calisma2/files/uploads/zigaxodudelugimadano.pdfIn PDF document text
    • http://inter-travel.hu/_user/file/67395988850.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/b3b30b4640561dd7f76f7e77750dad75/girubavopemidaxatiboben.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160fb1cf2acb9d---14677605959.pdfIn PDF document text
    • http://sakuragiramenandsushi.com/uploads/files/bolevepevirumaladiwazo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=ley+federal+de+procedimiento+contencioso+administrativo+comentadaPDF 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_off0000c4da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4DA 10916 bytes
SHA-256: 675f15e1c13907700245085e7a5fdbd0ad3f29d3c50388d4502a913cb5ea35ee
font_01_sfnt_off0000de1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE1B 16584 bytes
SHA-256: 8cfe5e28b44926d8e2baa31889e7b77fe5f4c7bdab2f2b8cbe9344381b7ff0c0
font_02_sfnt_off000107a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1