Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5af99b40932b486…

MALICIOUS

PDF

73.4 KB Created: 2021-07-03 09:37:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f54439a99f9535f907ce3339b2cf12e2 SHA-1: 39374fda75e13db05f0f00f1f88c777342c191a3 SHA-256: c5af99b40932b4861ec685ca4f5c3eefd23ccccddeef01dbcd00b4487a71c578
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised websites or disposable hosting, designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://sgo-bage.com/public/files/files/zinikozerede.pdf
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/f48754a3d0385933eda14ca22336e049/woxeletitevimetigakaripe.pdf
    • https://abeess.com/userfiles/file/vodixevixojurokapuzo.pdf
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dfebd9d3f9a---73582739945.pdf
    • http://www.alexgis.com/siteuploads/editorimg/file/57231223227.pdf
    • http://componentcnc.hu/uploads/ckfinder/userfiles/files/xopuvejizi.pdf
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/87cb1aa527b829f29bbb0ec6e50cb4a0/lijimitomow.pdf
    • http://martonelektro.hu/files/file/10919028052.pdf
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160acb8d21ce17---rifefiwizukozutiso.pdf
    • http://familiehollander.nl/images/uploadedimages/file/zogoboxe.pdf
    • http://kmkonsult.cz/userfiles/file/75894474635.pdf
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/vovulokaro.pdf
    • http://schokobrunnen.com/idata/jozomovowasogigepotezup.pdf
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/9cff4dee561f20237f52427b08b93eae/49016501989.pdf
    • https://alrashed-alsaleh.com/userfiles/files/44214250510.pdf
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/01s4pa6v06r8vuv421vq43o4vi/wimuzalonabina.pdf
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c96c1bcca93---20509457484.pdf
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/96033754950f72c2f9776848996b476a/66806629794.pdf
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/49a801321d3efe4287c5b7eb010edf84/lovevewojarobodixedi.pdf
    • http://csc010.com/userfiles/file/20210630175312_2u8av3.pdf
    • http://jhferry.com/data/fckeditor/file///fijipuxemenageju.pdf
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094fa1b98ed8---51228016697.pdf
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/96c8328eca233f2fe40ed200f1801835/vumepisisigisakafawusal.pdf
    • http://www.allatpatikapecs.hu/images/file/73840705852.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=iti+first+year+question+paper
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bd65.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBD65 16792 bytes
font_01_sfnt_off0000d577.bin
bee98aa78925ea3dac1118ec01a160af39718cb8e99a9d91323c7b8719a8bd1a
pdf-font-stream PDF embedded font (sfnt) at offset 0xD577 16236 bytes
font_02_sfnt_off0000ffed.bin
6b02abce399edb11632b03c9dde345f8f74b3220a46337e6b32fdde25735e8dd
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFED 10616 bytes