Malicious PDF — malware analysis report

Static analysis result for SHA-256 4546d725df7a14db…

MALICIOUS

PDF

98.7 KB Created: 2021-09-04 11:05:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f65f5d2d3225aed930f1af8ae353e482 SHA-1: 63ec506c4a570764226fbf67ac2f85694b6664e9 SHA-256: 4546d725df7a14db2b5d558f5e321cf3d7061d48a13bd211358649594ca87721
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous links pointing to potentially compromised websites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://ajtoablakcentrum.com/_user/file/nuronanuzimumodasika.pdf In PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/de326bc4e7693d064bdc6561445e3a86/rufanak.pdfIn PDF document text
    • http://www.moyekolodin.com/files/80979718869.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608de980da36e---fowiberafasubag.pdfIn PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/d3uu88pdl9gjn7lo3b8avqka7o/34440380113.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e461a394ec---lojatemoresugo.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609cdcb886b47---39850541744.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/suziduxasuxivaves.pdfIn PDF document text
    • http://mariancozma.com/_user/file/34055989629.pdfIn PDF document text
    • http://jorkurojus.com/userfiles/file/fazizuzusi.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/pmhkpihi7a5et928b9soql9ol2/nixuwuganafapa.pdfIn PDF document text
    • http://telmeed.com/web/ckfinder/userfiles/files/6852007273.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fbb8f563c8---27134629279.pdfIn PDF document text
    • http://boeschfamilytravels.com/clients/43210/File/2780009529.pdfIn PDF document text
    • http://wignaccent.com/FCKeditor_2.6.3/userimages/file/20210723161314.pdfIn PDF document text
    • https://www.orthovision-lublin.pl/ckfinder/userfiles/files/67181488162.pdfIn PDF document text
    • http://mayepnuocmia.vn/data/ckfinder/files/suzowijirulefanixe.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/7994d857f573761b0c2af94390914306/jenotasoja.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160720209f13c1---90244749305.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16094b810334c6---pezuwezifamekuboje.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/76c524cfbfa857b826826fe948ae5e85/mumipajedojutuguwoxoro.pdfIn PDF document text
    • http://back2wood.de/userfiles/file/61729282404.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/1b6b636e0eb5511eb97e1dc15a868ca9/zipegalenobetowetunekusuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=laney+ironheart+irt60+manualPDF 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_off0001104e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1104E 22968 bytes
SHA-256: f76a9321ab2a2426026c661f7e9d85215d6e8d8a37f839c9443b994250993372
font_01_sfnt_off00014b4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B4E 10664 bytes
SHA-256: e9e54f9c6cba3f6d93fc037f46d5a28c526c10fb8216382c74017f323585665d
font_02_sfnt_off00016397.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16397 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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