Malicious PDF — malware analysis report

Static analysis result for SHA-256 94544a9f997bd22c…

MALICIOUS

PDF

83.6 KB Created: 2021-09-19 11:25:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c94ae65b9efefb63ff74ba1fc6987d87 SHA-1: 9358a64eb459a89eeeffbfcfbd849a67070f34d8 SHA-256: 94544a9f997bd22c97ffcb799b113c70e85c54d9e60de8f7db360a2ef39f3d5f
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The presence of these links suggests an attempt to lure victims to external sites for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/992af071df2dec244741301b31007b47/tilobuvativadexosas.pdf In PDF document text
    • https://pmfegypt.com/userfiles/files/69103266703.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/63462740920.pdfIn PDF document text
    • https://khachsan295doson.vn/namthuan/images/news/files/zimazeporufopuluna.pdfIn PDF document text
    • http://bienbao.org/uploads/files/dajujavozawabofetulujesiw.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132ccf2193bc---3302477554.pdfIn PDF document text
    • http://tccsrl.org/userfiles/files/76814369855.pdfIn PDF document text
    • http://criminisiepartners.it/userfiles/files/fukewixululuv.pdfIn PDF document text
    • https://avflash.nl/upload/files/zajufizubuvowopibiwu.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/xasogixukad.pdfIn PDF document text
    • http://cristal-in.fr/userfiles/file/82058590264.pdfIn PDF document text
    • http://thenext.pk/userfiles/files/gupagezitiz.pdfIn PDF document text
    • https://charming-dc.com/uploads/files/202109090732299360.pdfIn PDF document text
    • http://emiem.pl/public/upload/ckfinder/userfiles/files/vamuwid.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/161453a3b9838a---57032038076.pdfIn PDF document text
    • http://top1np.com/ckfinder/userfiles/files/wemenadolalofokewotap.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/161348b770f71f---towonetefugizofiwi.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/25cb0822a7b845fd77a20efdbf08b1da/zinawovuralogukekifa.pdfIn PDF document text
    • http://bapassamarinda.id/assets/ckfinder/core/connector/php/uploads/files/30328833217.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/161356ade1d1fd---79556781268.pdfIn PDF document text
    • http://superfasttv.com/uploads/files/42969355720.pdfIn PDF document text
    • http://ikkosushi.com/uploads/files/17863117384.pdfIn PDF document text
    • http://foto-recepty.sk/images/fotky/wolami.pdfIn PDF document text
    • http://www.bash.cl/media/file/8886218481.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=android+open+permission+settings+programmaticallyPDF 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_off0000de46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE46 18688 bytes
SHA-256: c6f8716e9df211996bd92169418d86c5423e362ecf4704af15388af19d042e63
font_01_sfnt_off00010f2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012745.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12745 10952 bytes
SHA-256: 241d165388ce151867cd0443c1234e0378e0f6e481826d049b290fac2d71d1e0