Malicious PDF — malware analysis report

Static analysis result for SHA-256 beb7602e8cb228d5…

MALICIOUS

PDF

82.2 KB Created: 2021-09-17 05:20:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 879367e25fc2390d2bc36879230d2942 SHA-1: f31f021baee1aa79b470c4ca0125752c14338a27 SHA-256: beb7602e8cb228d5cbea466c81fd0cc148e5ce8ddc6625fe59f60f6bd86333e3
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple websites, some of which are hosted on compromised CMS uploads. The embedded URLs suggest an attempt to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://myphambambi.com/webroot/img/files/renaxedebomokonom.pdf In PDF document text
    • http://romangruszecki.com/uploaded/file/98826223795.pdfIn PDF document text
    • http://studiodabo.eu/userfiles/files/bikefemazeka.pdfIn PDF document text
    • http://freetds.net/userfiles/file/kebexodijed.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/b7b88ffeacd49f2ee0857089487a7011/wadisabikijamafu.pdfIn PDF document text
    • https://satnamunicipalcorporation.com/admin/ckfinder/userfiles/files/52798935667.pdfIn PDF document text
    • http://ngoinvest.com/uploads/ckfinder/files/puxotadasolo.pdfIn PDF document text
    • http://sushinamu.com/uploads/files/pujogu.pdfIn PDF document text
    • http://sanga.asia/userData/board/file/kixewixabok.pdfIn PDF document text
    • https://anhhuynoithat.com/asset/files/futipez.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138adb4c8883---gawuzaganeziwuden.pdfIn PDF document text
    • http://vrieshorst.nl/images/uploads/file/rameliwunujokogutalu.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135275e29ccd---45587082264.pdfIn PDF document text
    • https://www.barrau-philippe-sedeco.fr/ckfinder/userfiles/files/vudogokenesapi.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/16681613393.pdfIn PDF document text
    • https://medpressa.ru/files/file/79258742240.pdfIn PDF document text
    • https://o2opr.co/userfiles/files/40446192673.pdfIn PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/84115784377.pdfIn PDF document text
    • http://zit-tech.com/userfiles/files/sitelo.pdfIn PDF document text
    • http://0975811252cool.linker.tw/files/8024411619.pdfIn PDF document text
    • https://grancom.by/upload/docs/mepuwuxowavikejevifipo.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/66078596072.pdfIn PDF document text
    • http://energo-market.ru/sadm_files/pudajuxus.pdfIn PDF document text
    • http://aotwresort.info/ckfinder/userfiles/files/33517615423.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=mmorpg+mobile+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_off0000dcdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCDB 18136 bytes
SHA-256: 8e2bcff541556a7b03310a4a5db4ab2f6f1c71ac6b5f970393439674d30737f0
font_01_sfnt_off00010b92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B92 10600 bytes
SHA-256: 4f26e1d48eb019ec90bf5690cb7585fe5e5db49ba5580f1dfc229aa29a18df42
font_02_sfnt_off00012333.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12333 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1