Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fd6a95d94796777…

MALICIOUS

PDF

84.8 KB Created: 2021-09-11 09:44:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: acbe8f8a0dfca9a5cbea5fac9e89f21b SHA-1: e7d960e1b970254b453a60e951e787b8d4b88115 SHA-256: 6fd6a95d947967771667ad13cbbbfb7bbb01d21de1e49ece29cc4eb026d01807
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous external URLs, many of which point to compromised CMS upload directories or are structured as link farms on disposable hosting. The presence of these links suggests an attempt to redirect users to malicious sites, likely for phishing or to download further malware. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://ketchas.ru/uplcv?utm_term=how+to+show+screen+time+on+android PDF link annotation
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16136f4c251de5---74074974487.pdfIn PDF document text
    • https://hattoco.vn/images/ckeditor/files/jepunudijiwowunomajavenu.pdfIn PDF document text
    • http://udaybharat.in/ckfinder/userfiles/files/fabizugebulefejuvobaduvo.pdfIn PDF document text
    • http://mobilni-kadernictvi.cz/files/file/23319628029.pdfIn PDF document text
    • http://positiveforce.in/uploads/files/37919663922.pdfIn PDF document text
    • http://bangdientunhk.com/upload/files/wirefabew.pdfIn PDF document text
    • http://smingames.com/ckfinder/files/nimawuvikakaxi.pdfIn PDF document text
    • https://anukulagrotech.com/ci/userfiles/files/34313144281.pdfIn PDF document text
    • http://acupunctuuryao.nl/ckfinder/userfiles/files/5666781590.pdfIn PDF document text
    • https://vwb.mrv-educationservices.com/content_file/files/90168747494.pdfIn PDF document text
    • http://architettipassarinmarzotto.com/userfiles/files/jukidulinerabilebofopi.pdfIn PDF document text
    • http://nhadatv.com/webroot/img/files/fazuruda.pdfIn PDF document text
    • http://gleb777.com/fck_upload/file/59723975901.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/tquvds5d03p8q6n4gv6rbtkdn3/xodejavumupowu.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/hb115pi9rdkui5ck82nv0h1582/24382217806.pdfIn PDF document text
    • http://lafiestadelmoto.cz/files/file/mumebiwi.pdfIn PDF document text
    • https://coffotea.com/uploads/files/202109032155056405.pdfIn PDF document text
    • http://hosungtour.com/FileData/ckfinder/files/20210902_D523104DBB0E1623.pdfIn PDF document text
    • http://artattack-concerts.de/files/file/jalisajabok.pdfIn PDF document text
    • https://cfaegaianascente.pt/portal/userfiles/files/kaforabaje.pdfIn PDF document text
    • https://dawnraytech.985.tw/data/file/userfiles/files/88563932322.pdfIn PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/31158964930.pdfIn PDF document text
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/13304519410.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/cdcb9631d14b28d4baa667b831dd5fe9/wonuboguserulagufojotos.pdfIn PDF document text
    • http://upoart.com/ckfinder/userfiles/files/lagepobinofuf.pdfIn PDF document text
    • https://anandamsanyal.com/userfiles/file/xovowabegoxotonubep.pdfIn PDF document text
    • https://dukeofmarshall.com/ckfinder/userfiles/files/56192037279.pdfIn PDF document text
    • 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_off0000e775.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE775 17828 bytes
SHA-256: cb9c44ec4a7fb35b6040cc70251981de155203e8d0dcb0ea4adbe1bf3793bdcc
font_01_sfnt_off00011532.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11532 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D49 10668 bytes
SHA-256: 76f26f3d83a779e56a140dc86046479e6a97d48eba600fe67d126af01c69c44d

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