Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ad6676a882b76d1…

MALICIOUS

PDF

77.5 KB Created: 2021-09-25 12:46:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 6319c058b0ca6ecf29e915d4ab8e8f7b SHA-1: 568f7c33d6a722f47d07d08f20c8ae1e0af05ae6 SHA-256: 5ad6676a882b76d1aa39ea5542be04664eae2fbda49ddfdd3e17ea4096f660c9
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised WordPress sites, suggesting a phishing or credential harvesting attempt. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass security scanners. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to delivering a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://irlanc.ru/uplcv?utm_term=android+youtube+video+a%C3%A7%C4%B1lm%C4%B1yor PDF link annotation
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e5f9ae0d98---67285459808.pdfIn PDF document text
    • https://hamzsabegi60szallo.hu/UserFiles/File/85579256242.pdfIn PDF document text
    • http://atomiccm.com/userfiles/files/miboforotiri.pdfIn PDF document text
    • http://lawyermo.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/9794436470.pdfIn PDF document text
    • http://kronospan-mofa-hungary.hu/editor_up/94974359143.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16133c8969947c---guxavogokazen.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/89119722360.pdfIn PDF document text
    • https://akanaymatbaa.com/calisma2/files/uploads/madowumilovuvolawov.pdfIn PDF document text
    • http://bkht.vn/userfiles/file/mawufifenusojilizozimemu.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/gasapopitewela.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/kijarafubifa.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161411daa0d097---71223965282.pdfIn PDF document text
    • http://fd-health.com/upload/ckeditor/files/rumipiximibojimezapivo.pdfIn PDF document text
    • https://tktravelkorea.com/FileData/ckfinder/files/20210916_A6C71E3D37B101C2.pdfIn PDF document text
    • http://boschvietnam.vn/files/usersfiles/files/zekogugunakawatamoxab.pdfIn PDF document text
    • http://leprofit.ee/cmsfile/contentfiles/27947041588.pdfIn PDF document text
    • http://saharun.org/uploads/ckfinder/userfiles/files/pamezukuw.pdfIn PDF document text
    • http://longarmquiltingacadamy.com/fckeditor/userfiles/file/24657331165.pdfIn PDF document text
    • http://refah4ter.info/basefile/hotelrefah4terir/files/fiwawi.pdfIn PDF document text
    • http://benetworkingpro.com/ckfinder/userfiles/files/93602438808.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614225a4e2611---26394110572.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/66905487027.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_off0000c820.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC820 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e032.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE032 18664 bytes
SHA-256: 63fc55327c42d1cb57b80379392c050f2861cc7668c7a46d4cb37c99e4655481
font_02_sfnt_off00010d85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D85 10884 bytes
SHA-256: 58ac687644d09b11574b2b291274ae13c0daea46fcbcb33d8ef9eebcfc31405d

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