Malicious PDF — malware analysis report

Static analysis result for SHA-256 63dd31be11806d56…

MALICIOUS

PDF

233.9 KB Created: 2021-07-05 02:58:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f1f2d2a65650ff9e38759074320afa8d SHA-1: b2980c075f755307002cc1bb676a4c3379aeca2a SHA-256: 63dd31be11806d56ad2fc9c8aca2104cad21aedbfef16173c41b7e4641cfebc1
166 Risk Score

Malware Insights

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

The sample is a PDF document that employs a social-engineering lure to prompt the user to install a browser extension or update. This heuristic, combined with ML classification and ClamAV detection, strongly suggests a phishing or malware distribution attempt. While no scripts were directly extracted, the PDF structure and embedded URLs indicate a malicious intent to redirect users to potentially compromised sites for further payload delivery or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9777

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • 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://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/t6jk688uop3j13rsvsvda7nt8i/vemuvufasep.pdf
    • https://webmenuplus.com/images/file/netulu.pdf
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16081aadddddab---73332780883.pdf
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089c24d3030f---xinuri.pdf
    • http://komputerzagrosze.pl/userfiles/file/76320106744.pdf
    • http://firanywiktoria.pl/uploads/editor/file/rolenuzazavenatuvobofa.pdf
    • http://dilimkebab.com/userfiles/file/37146181468.pdf
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/mss0k1fphk04aqemluh571m26j/15799773939.pdf
    • http://crystalsteakandstogie.com/clients/1/1d/1dbb6d5698303b6304ae84622e226a19/File/lopujujubi.pdf
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/54841228040.pdf
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160accbb7ee50e---jakolejorikuwebusogexekab.pdf
    • https://matrainagycsalados.hu/userfiles/file/mitalugorigam.pdf
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/c7cbcf17e9094058cb524ccfce0d452a/wunomezurolonabogotu.pdf
    • https://bitree.com/ckfinder/userfiles/files/sajivumapoxivota.pdf
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bac91c865e7---83169125807.pdf
    • http://mwflower.com/upimagesfile///39155398778.pdf
    • http://funagamex.vn/PhuongNamGroup/userfiles/files/gigalerireza.pdf
    • http://karpatskiles.ru/store/files/jikofakexizodimeg.pdf
    • http://kkpump.com/FileData/ckfinder/files/20210616_D446A1B18723FA15.pdf
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16097f8b95967b---zavuluduxolagikizo.pdf
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/75870c551627e4e19072eaa183bbd33d/zonilanobelewurelobo.pdf
    • https://healthmatters.me/userfiles/file/sabor.pdf
    • http://wildpflanzen-planung.de/file/rukejuvavavufox.pdf
    • http://indianaquesters.org/clients/9/95/9573c8d6e108c9729a37356986dd5b5e/File/gamejofumetisafa.pdf
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/c6c6ac86865068de215153b5318e278e/3508324499.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=customer+focus+performance+review+phrases
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0003235b.bin
fdc3f250e16d4eeaac0151c08e1678493ac6cc67090af3137bc700c4cd553891
pdf-font-stream PDF embedded font (sfnt) at offset 0x3235B 16348 bytes
font_01_sfnt_off000339b2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x339B2 16792 bytes
font_02_sfnt_off000351c9.bin
d6387d74bc277316c59a9afefecbb3bd64fb6ce4dcfb8d994cf44c69a455c9c7
pdf-font-stream PDF embedded font (sfnt) at offset 0x351C9 10980 bytes
font_03_sfnt_off00036b3b.bin
13e49b90a99fb1d56b6f08e9d0de1723deff52551c42c7180970ac06a9a45593
pdf-font-stream PDF embedded font (sfnt) at offset 0x36B3B 17560 bytes