Malicious PDF — malware analysis report

Static analysis result for SHA-256 9784482f7e45edcd…

MALICIOUS

PDF

86.7 KB Created: 2021-09-24 09:57:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: db8460a3f3e44d54da8f3fa3390d1c1f SHA-1: 81a28a06bd6316b3f02c1282d2291dd3a79ad920 SHA-256: 9784482f7e45edcd5beeb876257105489fdaa46da5a05bbc1bd4de1d254ad750
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure suggests a link farm designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://smidgel.ru/uplcv?utm_term=manga+free+pdf+download PDF link annotation
    • http://fantacyhandicraft.com/userfiles/file/topidivavedajadaxuxipufu.pdfIn PDF document text
    • https://888nv.ru/userfiles/file/rujaduruzut.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/16141bb1e450ca---97986339686.pdfIn PDF document text
    • http://talentfuturesservices.com/sharpinstitute/images/files/kujemuluj.pdfIn PDF document text
    • http://xn--22cjbbm2eyae3ehabdb4kqdtae3dxnnc1fhf.com/user_img/files/rabuwiziwesanes.pdfIn PDF document text
    • http://medicalproduct.hu/images/files/mosilodifujorabenuvas.pdfIn PDF document text
    • https://www.edmcenter.xyz/ckfinder/userfiles/files/basugodirekiv.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161403485e874e---51239611029.pdfIn PDF document text
    • http://gzcaifeilai.com/ckfinder/userfiles/files/202109021918141027.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/f4baca4863d8a0e9150123137877e67d/wamalofutajafo.pdfIn PDF document text
    • http://corising.info/sa_upload/userfiles/file/20210917211316.pdfIn PDF document text
    • http://z-him.ru/userfiles/file/25978985183.pdfIn PDF document text
    • http://camonetinternational.com/files/file/soxuwosupapu.pdfIn PDF document text
    • http://vuadiemtayninh.com/hinhanh_fckeditor/file/94880086787.pdfIn PDF document text
    • http://autowagon.it/userfiles/files/17480236306.pdfIn PDF document text
    • https://joinvita.com/neu/userfiles/file/gofurilegilesozaforasofuz.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16143fbee5c71f---govadunetasevakel.pdfIn PDF document text
    • http://amicalelaique-guyancourt.fr/ckfinder/userfiles/files/11410993777.pdfIn PDF document text
    • https://keralatemples.info/ckfinder/userfiles/files/vozobonugi.pdfIn PDF document text
    • http://massarentearchitettura.com/userfiles/files/tazikumado.pdfIn PDF document text
    • http://yourhealthyanswer.com/ckfinder/userfiles/files/11258931843.pdfIn PDF document text
    • https://franciscojaviermoreno.com/DocsCKeditor/files/telediwuv.pdfIn PDF document text
    • https://underworldgear.com/admin/images/fckImg/file/94842330653.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/538777450.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_off0000f0ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0ED 10396 bytes
SHA-256: 22ed850d99037a804faeabf46b115a59b1748127d23eee625b27999126405b82
font_01_sfnt_off0001085d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1085D 17428 bytes
SHA-256: 9d6541f090cc167029bd0f1fe7c1a80feff7735e6c8ce040e4d2d20ea4b2e42d
font_02_sfnt_off0001351f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1351F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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