Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b8748d71b419045…

MALICIOUS

PDF

85.8 KB Created: 2021-09-05 00:14:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3e7822be3bfcd91949623f88ff30873a SHA-1: 92de8d7729262c757995e64ed5a6ebd54e664ca3 SHA-256: 0b8748d71b41904525c7cceb169fb879b374bc8607343a23b54228a71a384229
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan payload. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content or redirect users to phishing pages. The document body is heavily obfuscated and does not provide clear textual lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/161036096f3696---jerajujak.pdf In PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/0c90aee1c7c54be6e020a4e856570dd9/favagubutubuj.pdfIn PDF document text
    • http://gadkowski.pl/repository/filemanager/file/gedaratipemutosuku.pdfIn PDF document text
    • http://studiofranzoni.eu/userfiles/files/86508142775.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/f5fcc1abe785055bbf207cc915e1d817/nesive.pdfIn PDF document text
    • http://radio6deenero.com/uploaded/files/52637336020.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/23a39b855c87beee1cd8c5b4e0a278fb/81143142744.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/1c9dd4c3ba617ed838a04cf910ca1277/temutigadoxa.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f958882e14---8874130523.pdfIn PDF document text
    • http://paraleumarian.ro/app/webroot/files/userfiles/files/dudenenigazilemus.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/53412c2eecb3b6da293f801def228859/fibos.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e02aaa6bbd8---62983507231.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/130306171637.pdfIn PDF document text
    • http://autoservizimensi.it/images/fck/file/tukaf.pdfIn PDF document text
    • http://laserinnsbruck.com/static/sizupowig.pdfIn PDF document text
    • https://theatresaucinema.fr/uploads/file/dutefojaxanijik.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/004cee18014bea7e01e68c312128d28a/tuxufalogadakabisevipiji.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/789bb98874f633fab127bdce72023c52/luzojeg.pdfIn PDF document text
    • https://sokolzgierz.pl/web/uploads/files/34910509001.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/naxaxoxudomufesunile.pdfIn PDF document text
    • http://tg-focus.ru/userfiles/files/35715831383.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160b4a030ef388---dagafiwodopulagixosad.pdfIn PDF document text
    • http://k-sta.kr/FileData/ckfinder/files/20210725_30FC0D0318C3AE6A.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/36bd4e6cfbda8e1dd97b41b7881709a5/rotewaniwona.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=tratamiento+para+ictericia+neonatal+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_off0000e88f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE88F 18584 bytes
SHA-256: e44e513ceefaca68474e62fab3abd6cf156fb44d0a3ee00403ae454bfbb513cf
font_01_sfnt_off00011821.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11821 10576 bytes
SHA-256: 485c09fcb6f612104f48ef0969fb29feb151d428c8d1908d934dd844894c2f00
font_02_sfnt_off00013037.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13037 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1