Malicious PDF — malware analysis report

Static analysis result for SHA-256 97dce1dffe2b5a0e…

MALICIOUS

PDF

82.5 KB Created: 2021-09-05 14:02:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d50649b331a581bc900c53a077de54d4 SHA-1: 4148682443463a18068b81117a1ae4d14b842229 SHA-256: 97dce1dffe2b5a0e562847a7edd0c94c5252f05150e8d69ca10871e29f528e14
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, likely to distribute further malicious content or phish for credentials. The PDF structure itself does not contain executable scripts, but the embedded URLs are the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://candientu24h.vn/webroot/img/files/wilexebimokenukuwubawuf.pdf In PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160881f1e22517---wasebowozav.pdfIn PDF document text
    • https://eqonetech.com/upload/userfiles/files/51186676062.pdfIn PDF document text
    • https://www.makathastaliklari.net/wp-content/plugins/formcraft/file-upload/server/content/files/16080ae1c5490d---37773061953.pdfIn PDF document text
    • http://clarasonic.com/upload/file/fobonesinabuj.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160736f18eab4d---mewezexizabixofizibepepab.pdfIn PDF document text
    • https://bocion.com/ckfinder/userfiles/files/91407676317.pdfIn PDF document text
    • http://ttccid.com/userfiles/file/20700804752.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160aa997ea5cff---voxem.pdfIn PDF document text
    • https://xuantruongtech.com/images/ckeditor/files/52549291064.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a83ec969c61---13920176031.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad1f515ea0---vumonavimovanukik.pdfIn PDF document text
    • http://copingconversations.com/userfiles/file/tugojikeg.pdfIn PDF document text
    • https://salubrismd.com/wp-content/plugins/super-forms/uploads/php/files/f8da27883f8871b1cb2fc8285ac9df4f/wuxekogaduki.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/iic47bbeo0gkkmng2kmplr3vp5/nunatibobeteravenevafite.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/e033221b2f85ee1a84927a3a7fc7ec7e/20818491897.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a463ec6a0fd---86295503148.pdfIn PDF document text
    • http://samuiluxurytravel.com/Uploads/file/joxoba.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc741ceb78---47591949422.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/45fa39ad6759886c2e0bd10c1ff47edc/7736465845.pdfIn PDF document text
    • http://amy-tsai.com/images_express/userfiles/files/90873929695.pdfIn PDF document text
    • http://www.deewanalarab.com/up_imgs/96382828747.pdfIn PDF document text
    • https://heks-tech.com/app/webroot/userfiles/files/vazerixi.pdfIn PDF document text
    • http://mawaevents.com/uploads/file/kalonuzoxazobipaluwix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=billie+eilish+i+love+you+piano+sheet+music+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_off0000dac9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2DB 18484 bytes
SHA-256: 2c4ccdcea1efb91d32fe05814f68c469e7807fbfd802589aa8cb9784748bd5d2
font_02_sfnt_off0001228d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1228D 11120 bytes
SHA-256: b71bbbcfa17c63bb27955ddfb1e563605509ddd624e35ba63297e9fa4c27758c

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