Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3ad8ab2829c254f…

MALICIOUS

PDF

84.6 KB Created: 2021-09-17 13:48:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 78716fe1693a8072000ffd9cc9ddc30e SHA-1: e248672919b068eff78e9c3e123bbd3a815bca2d SHA-256: c3ad8ab2829c254f529d029a706b5b06e16268929864896ed6da62c8e30893ba
164 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous links to compromised websites and disposable hosting, suggesting it is part of a link farm designed to distribute malware or lead users to phishing sites. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crysiq.ru/uplcv?utm_term=ishaqzaade+movie+free+download+for+mobile PDF link annotation
    • http://khlongtoei-nfe.com/library/userfiles/file/6274240025.pdfIn PDF document text
    • https://h1t-urlaurora1-turbo.com/contents/files/25921270726.pdfIn PDF document text
    • https://xn--23-6kci4asohe8k.xn--p1ai/userfiles/file/dibabixejixiforoto.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/161344cfb30180---gadutexizazekotu.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/wizikokejivu.pdfIn PDF document text
    • https://priscar.com/documents/files/99897949344.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613603ad970a9---gevujugiwusilid.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/e856e870e5bff9f5c527ec795d788601/jiwaduzoniwilavud.pdfIn PDF document text
    • http://anais.terminarz.online/kosmetyczka/krakow/files/boxofuxeziva.pdfIn PDF document text
    • https://wisestudentz.com/userfiles/file/bezato.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/gudukubosejipiragenasuv.pdfIn PDF document text
    • https://mariapolis.net/ckfinder/userfiles/files/gozaje.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/wugumuzuzopudog.pdfIn PDF document text
    • http://microsolder.hu/userfiles/files/javedelatenite.pdfIn PDF document text
    • http://reopen911.info/media/file/67427801544.pdfIn PDF document text
    • http://acupunctuuryao.nl/ckfinder/userfiles/files/90079264699.pdfIn PDF document text
    • https://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/2972213500.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/c9d75d1a0ed55b2987f3beff45e355c5/65266344535.pdfIn PDF document text
    • http://dc-a0dcf319a153.breakthroughsport.com/userfiles/files/kefuwemapowopoko.pdfIn PDF document text
    • http://boden.boj.se/uploads/userfiles/files/62453054576.pdfIn PDF document text
    • https://tonymusic.se/UserFiles/files/65873506639.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138dd92687ec---63686803421.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/5dcba020c8131bdd45883b7114bff616/fitaseri.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_off0000e6ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6EC 17224 bytes
SHA-256: 9eb61d2d265e6b8df26d924a882a17d28cacd042f00e202835c9104d4988c3f7
font_01_sfnt_off000113a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012bbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BBC 10972 bytes
SHA-256: d4946197aacb90afae4f1d665953ee152e48e862e55ec761e68a1dabb8378575

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