Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce962fdb04786ec9…

MALICIOUS

PDF

80.6 KB Created: 2021-09-04 01:20:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a6677212da69b75dcf103bf8ff9bad12 SHA-1: 33df76afdc83c0604f23064ec21d9ca49192cef1 SHA-256: ce962fdb04786ec9a0ed92cb5d89d1482cb93abbf11750e8110e8248433d3800
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 contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable hosting, suggesting a link farm or phishing lure. The PDF structure and embedded links are indicative of a phishing campaign attempting to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/8faad1c1826165f3fac7566b283acb7b/8373297851.pdf In PDF document text
    • https://bustotoronto.com/userfiles/file/13877842388.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/92998584063.pdfIn PDF document text
    • http://www.donboscovizag.org/images/files/95686420791.pdfIn PDF document text
    • https://flexrocksrollovers.com/wp-content/plugins/super-forms/uploads/php/files/m2rmt1ekmos0fagn7miv8b1c2a/virefimitam.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160fc601b955d5---mabufexivipo.pdfIn PDF document text
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/10053695722.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/74391659014.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf5fd53176---59898689026.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ab8452149f5---71183176428.pdfIn PDF document text
    • https://yuanfuconstruction.com/ckfinder/upload/files/74396551419.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/acpkrdgb5hgm4pa51oe7e463c3/jinopemu.pdfIn PDF document text
    • https://abandassociates.com/ckfinder/userfiles/files/29730385812.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16087c28280a53---42732867727.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/sosojapotelidesilugisel.pdfIn PDF document text
    • https://textolinguisticsolutions.com/upload/editor/file/15831793903.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/dolusasimaparirororuj.pdfIn PDF document text
    • http://cjandjunemillerfarm.com/clients/75830/File/dufixuluzixogarati.pdfIn PDF document text
    • http://phukhoabacninh.com/images/files/68452403695.pdfIn PDF document text
    • https://helicopterleasingservices.com/userfiles/files/61722307029.pdfIn PDF document text
    • http://giustizianuova.it/userfiles/file/wemikatilela.pdfIn PDF document text
    • https://123natura.com/stockages/files/26870835447.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/n4te08lrrh0oksktf7cf8mr923/jisaruwukowizulap.pdfIn PDF document text
    • https://riondene.ch/img/uploads/file/nubunagomobejokadapot.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/22473700125.pdfIn PDF document text
    • http://yuqiaohome.com/uploads//files/202107301355359668.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=starting+out+with+python+3rd+edition+solutions+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_off0000d34d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD34D 17860 bytes
SHA-256: 54339d1120ee3b82fc1efb7b9d2528bb067157e73c8bbef6911bd6726b8a7e29
font_01_sfnt_off000101ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A04 11324 bytes
SHA-256: 150574617cd63b8c234bc0d7cbe239a1fa785c89aef1bf4ba1d05618c011a72b

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