Malicious PDF — malware analysis report

Static analysis result for SHA-256 3db1873ba0d9f6fd…

MALICIOUS

PDF

89.8 KB Created: 2021-07-06 02:00:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 8259aa921bdb5fd2ac83e1b06ba0f916 SHA-1: 6b18822b0d64e90c8df9391c6023ab5624b7c675 SHA-256: 3db1873ba0d9f6fdb12d5755cb7ca1fc16c78bac1c07e17ccfe4c2fe655626fd
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 installations and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with a phishing lure designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/160821f6753d83---daxawulomipigipusuza.pdf In PDF document text
    • http://polymer-optix.de/userfiles/file/89289474952.pdfIn PDF document text
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/pol35g5i0ajk13i9g3bjqk5ea3/luzogarigerebasefaleke.pdfIn PDF document text
    • http://allycatering.com/userfiles/30784417601.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/41430292351.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b20551665fe---75086336471.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/35239604532.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073069e28aca---jubazajama.pdfIn PDF document text
    • https://vresponse.net/userfiles/file/pujivasuzorepofusizakov.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/runesuvepupegezawozilaro.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/27733228456.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/37223268285.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160d4ecc4e30b6---jebabogaw.pdfIn PDF document text
    • http://rayzerfamilyreunion.com/clients/0/08/08e2d5bcffca37c2e1a82d364f4296c6/File/relubosimejelufor.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9d21033df---38053081857.pdfIn PDF document text
    • http://alkanboya.com/files/file///wurotegebukawojedudo.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160dac2919f54e---kidarogoxezimadezojad.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4beaef23c---gofosuvivitamagow.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/cac5904427f636aa8c0f162b8deee7d6/wemetuxuvejas.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160888c38e1d15---dirawilimowijivifo.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8320b4d2d---64685118191.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/kf1hn4g9c54dmbhaie4d0c8ja4/25865820701.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608c359328072---28460832052.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=my+own+imaginationPDF 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_off0000fd2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD2C 10200 bytes
SHA-256: 46b41481c4d7526dd3e905f395a8a75f68f43321c1b7ad99850f8229c8587914
font_01_sfnt_off00011412.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11412 17960 bytes
SHA-256: 8b500f735bbf0bedc55e69a760608c00ec5d51d01fc1de1c1af322980024537f
font_02_sfnt_off00014221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14221 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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