Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbbb2d4bf343affd…

MALICIOUS

PDF

90.3 KB Created: 2021-08-07 09:04:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3eeb80600aa29e378118c97a2868ebdb SHA-1: 3de154e5a4483b86c0b1c881279900a077db921f SHA-256: cbbb2d4bf343affdfe34d677c7bdaec87163239a998953aff64ee904ce4745b0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, hosting numerous URLs pointing to potentially compromised WordPress sites and disposable hosting, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9945

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://bbpartner.cz/userfiles/file/loxirixufasefoputapabana.pdf In PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/014af46228c43035eb92868a21734d82/jamesadipanelup.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608211181e2c2---54246766341.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608397609fa9f---geludowewixibusowopak.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/3c63c9d0324ed317fbf4bbaf3297fedc/19939862418.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/2021528142203114.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609b55ddbc150---tomujunuz.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16092a6586262f---rofifanuzodirowix.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202106281350175975.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/jagagokuxumobuw.pdfIn PDF document text
    • http://waukeganeast1980.com/clients/877304/File/noluwimijotexabomefujiwa.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160f2d9dd38421---5641151284.pdfIn PDF document text
    • http://hotdeals24x7.com/ci/userfiles/files/tubomu.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/nugagalaxuzalanato.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/4423b392113b375abe1575f500e86a16/bizoxiritiji.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021080609152131.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/fa7df335522a9711c0c033f49ac131c8/dofunages.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/c49e4838c556f223c3b815bc28819bc3/wosazorilo.pdfIn PDF document text
    • http://sllight.ru/design/img/upload/file/topagowapunifi.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/rah198lob8robrs0co0c2cdd90/lerifadovizarezaxijafu.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/61d356aff6865382f031e23c265a83e8/rifeterifelevasatuziwet.pdfIn PDF document text
    • http://vmkmsz.hu/userfiles/file/bulobemomepavule.pdfIn PDF document text
    • http://hkalc.com/userfiles/53005910696.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/30570767621.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/4v882d1qv0i5k0k4r1u4vt4si3/fedej.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607070f7c961a---retisutawofe.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0bed9e85f1---24932330830.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=environmental+issues+in+africa+worksheet+answersPDF 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_off0000fce4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE4 10928 bytes
SHA-256: a1bcb3606349c9f9e0158704f5dc9ce13cb29fedceff43cd6bc306df90d71eb1
font_01_sfnt_off0001161a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1161A 17020 bytes
SHA-256: e334760cfb38d739e6b2763afd580835001391da5c18b47fcfc9cb4d2318536c
font_02_sfnt_off00014268.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14268 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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