Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9aa8cd402fd2409…

MALICIOUS

PDF

69.6 KB Created: 2021-09-26 03:15:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: af12f1e3f4ce51fdd986363e6db5993a SHA-1: d3c07490df1acaac1cb555672043f994bb286ce3 SHA-256: b9aa8cd402fd2409a3896a24b235069c4c6eeba04497ceef75a4b104f5109a30
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 websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these link farms and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://publicbridge.pl/userfiles/file/6520895636.pdf In PDF document text
    • http://jlicentral.com/images/authors/file/89362813112.pdfIn PDF document text
    • https://prettygreekvillas.com/admin/fckeditor/editor/filemanager/connectofile/vovajugovenepu.pdfIn PDF document text
    • http://ji-tien.com/userfiles/file/mogurekewinetekaro.pdfIn PDF document text
    • http://ticketsperiodico.com/galeria/files/piwanunudilerukavidure.pdfIn PDF document text
    • http://billagelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/27737030571.pdfIn PDF document text
    • https://aiwcecckolkata.org/FCKeditor/file/mamijijesivero.pdfIn PDF document text
    • http://alanaf.ru/userfiles/files/83434686321.pdfIn PDF document text
    • http://kcpsystem.com/userData/board/file/24267894552.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144b52c7da28---tomajobafigejifowaf.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210903123610.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/othohblvf363l4rpo273jlt9v6/93048732338.pdfIn PDF document text
    • http://www.520amis.com/upload/files/47860617782.pdfIn PDF document text
    • https://docommerce.co/calisma2/files/uploads/9642345306.pdfIn PDF document text
    • http://mitcostruttori.it/userfiles/files/26087340838.pdfIn PDF document text
    • http://gmtshipping.com/attachment/file/lovaxa.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/fa239613ff44e49bfe4bbf229c9f5cc6/xiwanek.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/10966776241.pdfIn PDF document text
    • http://fs-select.com/images/blog/file/fuwugu.pdfIn PDF document text
    • https://wendi101.com/userfiles/file/delatumutonipoja.pdfIn PDF document text
    • http://ozdesignhouse.com/app/webroot/uploads/files/58371517626.pdfIn PDF document text
    • http://balogmihaly.hu/UserFiles/file/36124377411.pdfIn PDF document text
    • https://5udua.com/contents/files/sozakuse.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=how+to+see+wifi+password+of+saved+network+in+androidPDF 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_off0000aed2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAED2 16296 bytes
SHA-256: 6c7af33b50727a5edb6db5adfab5218ae73a10fa2569bb5a289f5bef78044b83
font_01_sfnt_off0000d7a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A0 10680 bytes
SHA-256: d26ccc8b45bb9bcea0ddb6c509783eb70ab648847bad08b209f6e480b22812f2
font_02_sfnt_off0000f052.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF052 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1