Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a2dcf4641ac62bd…

MALICIOUS

PDF

85.5 KB Created: 2021-09-14 04:24:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 23cb74521921275793d767978e345f60 SHA-1: 25e340fdf82024e7f40a05aaaf7d6217fcf0e1d8 SHA-256: 3a2dcf4641ac62bd20e83c97c0fcd0263699b2d97f2ca227f0ad5de8fd57f3ed
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains a link farm with numerous URLs pointing to disposable hosting and compromised CMS uploads, suggesting an attempt to lure users to malicious sites. The document body is heavily obfuscated and unreadable, providing no direct content clues but reinforcing the suspicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://purefeeling8.com/data/file/74977548674.pdf In PDF document text
    • http://exms.fr/sites/default/files/file/josikujires.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/5871703460.pdfIn PDF document text
    • http://isotope3.pm-ural.com/uploads/files/16147143662.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a82bbcc4a7---ledogagejizonutogup.pdfIn PDF document text
    • http://gaudi.tw/upload/files/wejemavoj.pdfIn PDF document text
    • http://savoie-outils-coupants.com/ckfinder/userfiles/files/9190440488.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/gd38lsba8gbhebob8rs42m2lgr/kibepegirenan.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/rtiv2r033677l0kr2molg3creh/puzateb.pdfIn PDF document text
    • http://hcstonetw.com/uploads/files/202109050420472938.pdfIn PDF document text
    • https://bisleriwheel.genefied.co/ckfinder/userfiles/files/merasujora.pdfIn PDF document text
    • http://myslizdrave.com/soubory/18870542398.pdfIn PDF document text
    • https://paardenwelzijnscheck.nl/app/webroot/files/ckeditor_files/files/rowozavodadusadago.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d89c5f421f---34678315205.pdfIn PDF document text
    • https://vntdc.com/upload/fck/file/19975502984.pdfIn PDF document text
    • https://francois-daulte.com/ckfinder/userfiles/files/vinisop.pdfIn PDF document text
    • http://seto.cz/uploads/154513540.pdfIn PDF document text
    • http://jowinbio.com/upload/files/202109020513534871.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd85286b5e---garetejuruvofadafat.pdfIn PDF document text
    • http://xn----dtbhwhggdaoqfh3d.xn--p1ai/media/file/xugoj.pdfIn PDF document text
    • https://djennebeads.com/nbloom/fckuploads/file/pajatesupelagagazovigime.pdfIn PDF document text
    • https://portalbime.com/UploadedFiles/New/file/6600041117.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/ca005f5bc15fdbcfa313cc0f6b8841cc/meduvodamujaxovijedefugox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=best+hacking+tools+for+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_off0000e8ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8ED 10900 bytes
SHA-256: 7500ae764be53e94fc6e2588b738e1b1a8a85d8febfab100e52fb19660b77dac
font_01_sfnt_off000101eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119FD 17308 bytes
SHA-256: 7e889a6c43c2716133459546de3da6413981a3c6c4c08f55d129c4a4d77f5526