Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7d833956c5ccd98…

MALICIOUS

PDF

82.2 KB Created: 2021-07-07 12:14:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 456242ba0035adb39f564b5f097d0fc5 SHA-1: a836c27e2d555b9273ca21da81b4477b00871bcb SHA-256: b7d833956c5ccd9854648d9f9fc4937d9b78fccbae8731fc9b51dc6366d874cf
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF structure and the presence of external URIs are consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://espaciocultivarte.com/ckfinder/userfiles/files/kopekozog.pdf In PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/15604c9c03c3584e56dc8f8132f7fa0e/kujasapurazowalaf.pdfIn PDF document text
    • http://beepost.vn/upload/userfiles/files/71852209345.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/dce9645a374ff2ef20fcb71bbb4310e0/jofuviwewomolerabu.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160752340d5255---niveleguniva.pdfIn PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/20830306978.pdfIn PDF document text
    • https://addsfly.com/userfiles/file/48126540245.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/dutosiruvaxefomax.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/d17129f3d7c54ed5858fa9dc2c4fe150/48493893820.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd4721745b---senapepive.pdfIn PDF document text
    • http://epoxidice.ro/mm/file/76172606905.pdfIn PDF document text
    • https://autotronics.vn/userfiles/file/sobux.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/27071873547.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1426891a5c---batikenutajatuposimaku.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/17068689321.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/c8a3a45903d7b5ac5a54acfd308e222a/vugasokifoduzunigugupanik.pdfIn PDF document text
    • http://nutranghongngoc.com/media/ftp/file/faduropoz.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/9fc989e292da1ff78af7a0f426aa6c6f/93945308540.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c6963a7a54b---3710873090.pdfIn PDF document text
    • http://maynenkhipuma.vn/quangbasanpham/app/webroot/upload/image/files/duzajalaf.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/56088a8c22a27c2d2aec53f156828a25/watufan.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/5c1b25e3414923d5b8324f1eb9053568/98116366857.pdfIn PDF document text
    • http://spearsyounglegacy.com/clients/b/b2/b2c23f164518415ec8f3c1c8d0af542d/File/kugupus.pdfIn PDF document text
    • http://dermalab.pl/userfiles/file/93638063312.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd7490508d1---sozevogulelizurobedepo.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c47a20c60ca---87813614161.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/marawajugaro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=colposcopy+biopsy+after+carePDF 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_off0000e008.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE008 16596 bytes
SHA-256: 3112ba7a9ceec8c70475774bf5a47c40d26c80bb69756ddce82b187353e99e1b
font_01_sfnt_off00010b05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B05 10656 bytes
SHA-256: 2d5d4c50022636b4d9a7ec616176659bcc02fedbb71b9b36737715ab8d65fe61
font_02_sfnt_off00012369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12369 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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