Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ad09bc64c6b7a5e…

MALICIOUS

PDF

73.0 KB Created: 2021-09-19 01:33:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2569a0123bff334713ca00e3c737e5ea SHA-1: dfa443c8a7cf5c14ab442706f84cb8bc3d9b890e SHA-256: 0ad09bc64c6b7a5e3131d6df334f880ab294179b59e25c03d69cb3974723278d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://otevrel.eu/ckfinder/userfiles/files/57969701006.pdf In PDF document text
    • http://fernandopelosini.it/userfiles/files/93617098141.pdfIn PDF document text
    • http://polipadel.com/userfiles/file/julojizababekij.pdfIn PDF document text
    • https://longhoang.vn/upload/files/88725500492.pdfIn PDF document text
    • https://myagenda.myagenda.cz/pictures/editor/files/fasifotogote.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16139387961d98---24591246571.pdfIn PDF document text
    • http://madveras.com/ckfinder/userfiles/files/lubuxukubozafegose.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/f8be6631817537f6266debb28f7e9630/nagulijaxe.pdfIn PDF document text
    • http://metalzilembo.it/userfiles/files/mizuvuvuwogojovojukes.pdfIn PDF document text
    • https://ispartaorganizasyon.com/ckfinder/upload/files/63718060246.pdfIn PDF document text
    • https://angelsolutions.ro/ckeditor/ckfinder/userfiles/files/47823415464.pdfIn PDF document text
    • http://violetstudio.in/userfiles/file/jasadejubopuladepuji.pdfIn PDF document text
    • http://chia4kids.ru/ckfinder/userfiles/files/85394987586.pdfIn PDF document text
    • http://www.armstrongre.com/files/files/pukigowoz.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1613174d14415d---80105065858.pdfIn PDF document text
    • https://mayphotocopydogia.com/upload/files/37320002393.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/lemiguvowikabofakisik.pdfIn PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/25040666519.pdfIn PDF document text
    • http://urotunisia.com/uploads/FCK_files/file/pozujekoxajujinobenuwope.pdfIn PDF document text
    • http://nenkin-t.com/upload_img/ck/files/kimonipanomugabafut.pdfIn PDF document text
    • http://xn--80aer5aza.xn---42-5cdakyymnnb9ake1az.xn--p1ai/ckfinder/userfiles/files/zetamapulawaso.pdfIn PDF document text
    • https://jgranit.pl/userfiles/file/taban.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=comparative+and+superlative+exercises+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_off0000b51f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB51F 18340 bytes
SHA-256: 202dc64d725e6dab0ff5aabd8fa4cc3391329d57e532db07b88c5ff217807c07
font_01_sfnt_off0000e436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE436 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC4D 11080 bytes
SHA-256: 3ff0b0ca44b984380ee2a1ea3c5d27f6ba87bad1999d1bf825ee3b9b46b9fd55