Malicious PDF — malware analysis report

Static analysis result for SHA-256 a32854dd4eb3af9f…

MALICIOUS

PDF

85.6 KB Created: 2021-09-02 15:25:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c8ee9d94db483ad9cd29acbd01f14340 SHA-1: bde86bd70ce762614c6d75774d9c2ce71d8b2317 SHA-256: a32854dd4eb3af9fb410abc4d4c25d23cf58268e33b9feae805a7e60f7025297
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091ced9e7a86---jigubokev.pdf In PDF document text
    • http://canvangdientu.com/images/file/97314004370.pdfIn PDF document text
    • http://stoewebdesign.no/userfiles/file/jesemigop.pdfIn PDF document text
    • https://firsatoyun.com/calisma2/files/uploads/39012470506.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b18c3a3b078---3588972177.pdfIn PDF document text
    • https://menu2uplus.com/images/file/mozuxafevu.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c95acf8c0ef---10659738114.pdfIn PDF document text
    • https://mfdesign.hu/files/file/10041965626.pdfIn PDF document text
    • http://medtravel.lv/images/hand_uploaded/files/xuzakitiforulako.pdfIn PDF document text
    • https://livredart.com/ckfinder/userfiles/files/kulovawuvonudunep.pdfIn PDF document text
    • http://ehsclassof64.com/clients/b/bf/bfa5c4411462ceee4a19e543862d902c/File/wuxatipe.pdfIn PDF document text
    • http://morethancars.nl/uploads/edytor/file/vokasagekakuxeloj.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/xaziwemejanilabiket.pdfIn PDF document text
    • http://brmxn.com/userfiles/file/20210621050654_jgcord.pdfIn PDF document text
    • http://fritz-fahrlaender.ch/download/20332514704.pdfIn PDF document text
    • http://quesnelbusinessnetwork.ca/userfiles/file/vosodobitusub.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2467bc0fd---rilebosedad.pdfIn PDF document text
    • http://chronocertif.com/userfiles/file/28921405018.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609212095fee5---punawomovoraladimok.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/fexonojoburepiwe.pdfIn PDF document text
    • http://kemenyseprosiklos.hu/upload/file/45669924831.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/2ec202e1a925c28ec32a38456845790f/69522602258.pdfIn PDF document text
    • http://zatoodesign.com/userfiles/files/mameza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=warrior+shredding+program+nutrition+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_off0000e6a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000feb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB9 10992 bytes
SHA-256: 8c05cf7fdf1796dc609ff828b6345e8ce97c5fa92c3195bada8cca8a77629cb9
font_02_sfnt_off000117de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117DE 18620 bytes
SHA-256: ea322c8be80d5e42cbab8fd5e5d2a637849b6cf39c6898dd4f45792bd571d35d