Malicious PDF — malware analysis report

Static analysis result for SHA-256 8abab8bda1b6dcdb…

MALICIOUS

PDF

101.2 KB Created: 2021-09-03 07:22:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 244f93b53454f4b5c00024574424285e SHA-1: 73b25531179e8d1d894e0371129d9932d539585d SHA-256: 8abab8bda1b6dcdb1cd18ffd8d7ba3b89e31981c982594f98515faa9940e0790
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or SEO abuse. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://bandai-k.com/userfiles/file/sujivezirekuz.pdf In PDF document text
    • http://www.cenlafilm.com/siteuploads/editorimg/file/xuteribelexebufexogirufuj.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/36803763843.pdfIn PDF document text
    • http://chongros.com/userData/board/file/zetugotupumawilawesa.pdfIn PDF document text
    • https://ngoctraithaibinhduong.com/uploads/news_file/futaromidoduxino.pdfIn PDF document text
    • https://cmoretv.com/userfiles/nerudaduvebogedixowumamav.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4649e07eef---nelukamewoliwesol.pdfIn PDF document text
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/zijigepakovij.pdfIn PDF document text
    • https://clubelsendero.com/img_pag/file/farusegumenewukux.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/7fb006df0af8e70800b52ad4f00f088d/zerarovulusuvimikuxuzoz.pdfIn PDF document text
    • http://hyundaihungthinh.com/uploads/images/files/72579193926.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608108babee01---67769245311.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/mmg6oqfkoa8s7n7hfev6oic340/63276141797.pdfIn PDF document text
    • http://lokalizacja-gps.pl/userfiles/file/xixagekenoma.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16101281a77f36---6713869692.pdfIn PDF document text
    • https://dichvuketoanvn.org/uploads/files/selunekakizafuju.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/15388229548.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3bbc74203e---8072762558.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/89f3bfb7288010ed428137bce40c7da9/32753040780.pdfIn PDF document text
    • https://faceless.me/userfiles/files/59812490134.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-6-17/20210617094219102997.pdfIn PDF document text
    • https://ntct.dz/ckfinder/userfiles/files/56065410661.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=qualities+of+a+good+christian+husband+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_off000124a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124A7 11200 bytes
SHA-256: f6fcecb66568b9ec84985e347ed5664d3be68e3be0dc291a0921494e869711ff
font_01_sfnt_off00013e77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E77 18936 bytes
SHA-256: 0679debc7d8917a065415301cb5d0466b270eff1255dc5c1fb2e1507a55fd9e2
font_02_sfnt_off00016f13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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