Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5668e6d0670ab4b…

MALICIOUS

PDF

84.7 KB Created: 2021-07-17 09:11:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 4775972fc28ed108c78d05d3614979ac SHA-1: 4d282481eb42705da12ece92760d1d945e417de1 SHA-256: c5668e6d0670ab4b8b8b2bb2838088e79a37933c7f493414f550b25bd0ef0d1b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a9c03e5bd1f---sajosofixujazegafi.pdf In PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/beditesopesuk.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/43b2cef7c9b702f15e876d9cf4bb2447/20910692370.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c77d1b5f534---zivuxo.pdfIn PDF document text
    • http://designklasse.de/ckfinder/userfiles/files/gupekudu.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/2699e5aad49113d355f5ca22e62e9317/58713949981.pdfIn PDF document text
    • https://havanic.com/cache/fck_files/file/fumidililikesuwutiwinina.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/nezanapisuxizitumotoka.pdfIn PDF document text
    • http://qiangka.com/ckfinder/userfiles/files/xotogagime.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607e40dd78602---78576101372.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/d63c8ca5bc77999889f57b837ae96bf7/12606499790.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/5491870130.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/fvjap2co0nl06nfi1880hef7p2/63641909248.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16097a13798675---neduduwomosivirimexa.pdfIn PDF document text
    • https://michelbarbot.com/upload/files/7786573182.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9956b9da72---vodokupoxulito.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/zozajunuwekike.pdfIn PDF document text
    • https://roeveragri.ac.in/wp-content/plugins/super-forms/uploads/php/files/b14c5d8c2ee7832ae38e4f190e1b3d94/nunibiwepizosikoga.pdfIn PDF document text
    • http://atek-ent.com/upload/file/10778835979.pdfIn PDF document text
    • http://gialtour.it/themes/userfiles//files/leketokozemiwogelutuzav.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/945fba76096dde55a540deec3189ee6e/sakewomukefukewepawu.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b370ec9f8ff---rirebafo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=distributed+file+system+architecture+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_off0000e73b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE73B 11016 bytes
SHA-256: 7a9b228ac500a8ada3d533bbd1562bf8d3869e28f38f8c8da09c82fed7cf7176
font_01_sfnt_off000100af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100AF 17328 bytes
SHA-256: 7077b65c57ee1b4a152e8e9a488201454705f32adcd43d8e05f03fe7f6f84087
font_02_sfnt_off00012da9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.