Malicious PDF — malware analysis report

Static analysis result for SHA-256 390e68051baceb42…

MALICIOUS

PDF

97.3 KB Created: 2021-08-14 13:07:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 16f45c687800b498f2336444ee143544 SHA-1: b0300802247107a6b2660d03fdaa9da6c2b5465d SHA-256: 390e68051baceb42b52b6ca11630989229c1b12d639075413c756b3b75fb1235
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the structure and URL patterns suggest the PDF is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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://akicgiyim.com/userfiles/file/tedawoxubugupe.pdf In PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611460cf7a8b8---26030157005.pdfIn PDF document text
    • https://carcable-bg.com/uploads/pictures/files/41276917626.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-4-29/20210429032535969586.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b9789af01d7---poforejuweluzir.pdfIn PDF document text
    • https://mirrorlink.com/public/files/files/badamifaw.pdfIn PDF document text
    • http://ducnhua.com/upload/files/zikojukalapunijeje.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/d3d2e195b007c90b3cd15f978ec32496/losapix.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/b12da71a6e0bc6495813f4372e2849dd/71054423956.pdfIn PDF document text
    • http://starcity-vinhomes.vn/app/webroot/img/files/ziwazisutovunarapa.pdfIn PDF document text
    • http://viquadro.com/userfiles/files/28926681050.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5cd0be7836---18019840262.pdfIn PDF document text
    • https://tezerwatch.com/file/upload/files/07-26-05-00-14-27.pdfIn PDF document text
    • http://gianphoiduyloimodel.com/Images_upload/files/rulejefutajujasoretor.pdfIn PDF document text
    • https://pacie.vn/web/uploads/files/79171793338.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607a35135387d---45026648461.pdfIn PDF document text
    • https://clumba-indoor.ru/files/files/8708475395.pdfIn PDF document text
    • http://carrozzeriardue.it/userfiles/files/26799865068.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/i3v8t1su7uhpj1il476p6219oe/60215054719.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c488772fac9---48980497604.pdfIn PDF document text
    • http://staropolski.net/Upload/file/fakabenilawiteva.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aecd456e9bf---saxegejapivonemivexir.pdfIn PDF document text
    • http://pulsarvn.com/media/ftp/file/gidezebafukudod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=divertida+mente+filme+completo+dublado+download+megaPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e97a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE97A 20396 bytes
SHA-256: 40057088bd66d3301126b1e3858d58c26ec8dd81a4410813d2248bcbb522cf90
font_01_sfnt_off00011ad8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD8 13384 bytes
SHA-256: 01d3d3d652b25edf4c1f5b58cd75eeb9e6df9bccc1a70279a559ba22ab6709fc
font_02_sfnt_off000142da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142DA 11188 bytes
SHA-256: 8614fe9cbe08121070ae8617d89f54dc93890c9276ca3ec281153e5106f98c64
font_03_sfnt_off00015ca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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