Malicious PDF — malware analysis report

Static analysis result for SHA-256 75b26f985c30ba34…

MALICIOUS

PDF

85.3 KB Created: 2021-09-18 23:49:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 28dd49bd50aa9daafb285530a17950f4 SHA-1: 6284334d4733776b9e4d19d5a48297edef965e91 SHA-256: 75b26f985c30ba34da8be9e1bd9b0c597894ce849e72cde50d85ac9d9f8cd604
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm used for phishing or malware distribution. The presence of these links and the overall structure align with techniques used to lure users into clicking malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613f084c79806---86952248902.pdf In PDF document text
    • http://saothienemb.com/uploads/images/files/14378613164.pdfIn PDF document text
    • https://www.marjojaspers.nl/ckfinder/userfiles/files/tufisasomabo.pdfIn PDF document text
    • https://manage4.realtourvision.com/rtv/ckfinder/userfiles/images/files/dugepaxud.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/47821794534.pdfIn PDF document text
    • http://xutricolor.com/uploadfile/files/buvijukudisodavew.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16135e29e31175---wotape.pdfIn PDF document text
    • http://kleinschadenexperte.de/userfiles/file/28804976076.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/3d56068c19f0fb06ade10680d7cbdb86/xavogumaxatusazez.pdfIn PDF document text
    • https://a-1commercialkitchenservices.com/ckfinder/userfiles/files/suzerirefexutibawogelig.pdfIn PDF document text
    • https://szpital-sulecin.pl/images/fckfiles/file/pupoverinis.pdfIn PDF document text
    • http://vinhhangvien.com/upload/files/99753393168.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/files/45741255979.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/pukusimapixedo.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614620147b589---14096123256.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135ad202d9a0---85778350338.pdfIn PDF document text
    • http://holmeslawfirm-iowa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/28052728554.pdfIn PDF document text
    • https://esterkins.de/ckfinder/userfiles/files/lebobulujudalaj.pdfIn PDF document text
    • http://www.chubsorn.com/file/files/75987053858.pdfIn PDF document text
    • http://blevy.com/ckfinder/userfiles/files/vunakirivojapapafonov.pdfIn PDF document text
    • https://rotterdampools.com/contents/files/22709458259.pdfIn PDF document text
    • http://steelbo.com/uploads/admins/u0/files/20210914103144.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/sasuzideka.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/24439739350.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/ghm11n06vgtdh6rg6c48up0i0n/kizawojevewazopex.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ce261aed4f---zewetewebifu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=descargar+app+android+para+pcPDF 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_off0000eadb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEADB 10548 bytes
SHA-256: 7299dac6aa3dff1f931e62beb91ee063fbca0e1adc6ad07c72ebaa7b75d2fd89
font_01_sfnt_off000102c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C8 17276 bytes
SHA-256: d1ee34cba081609ebd59845247105486d681e2719067a9235fd4a269b1091d4b
font_02_sfnt_off00012f8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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