Malicious PDF — malware analysis report

Static analysis result for SHA-256 839f0f1989b1ff28…

MALICIOUS

PDF

80.1 KB Created: 2021-09-18 20:08:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7e3a8e366f3fe545e2653460e388f895 SHA-1: 13e3564b21e6e7cfb3a9b34cb6a7c1452378b6bb SHA-256: 839f0f1989b1ff28e0b4714c1ce139b731612648f1e5d3d5a9b8600a2457f45f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Several heuristics identified the PDF as a link farm, with many distinct hosts and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The embedded URLs point to various unknown domains, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xorutesimi.pdf In PDF document text
    • http://box8websites.com/ckfinder/userfiles/files/56021658246.pdfIn PDF document text
    • http://fecoil.com/userfiles/file/labegowovuf.pdfIn PDF document text
    • http://acutecardio.ru/sadm_files/77467924034.pdfIn PDF document text
    • http://mobilahomedesign.com/userfiles/files/lolazasaxageba.pdfIn PDF document text
    • http://dokumsuzgec.com/userfiles/files/xozufi.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613adea45f6de---turobugutufivozulejatudi.pdfIn PDF document text
    • https://braus.uz/images/shared/file/79827730325.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/fl219ef8h06bbnt4tsl743d5bi/85034686369.pdfIn PDF document text
    • https://lixtech.com.tw/ckfinder/ckfiles/files/rexogate.pdfIn PDF document text
    • https://mcdelandes.ca/uploads/file/35768373934.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161384288b4caa---22639524361.pdfIn PDF document text
    • https://harmony-lazienka.pl/Upload/file/36421505684.pdfIn PDF document text
    • https://akilanews.com/ckfinder/userfiles/files/debitumuximavinasazapa.pdfIn PDF document text
    • https://sanvexe.vn/webroot/img/files/5464016717.pdfIn PDF document text
    • http://ketphatthinh.vn/upload/files/jaforinofolafinuzowur.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/8d8ceb7b40c41404607588102aa6fc0c/savijisebo.pdfIn PDF document text
    • http://bjqyms.com/filespath/files/20210907105450.pdfIn PDF document text
    • http://chonburi33.com/userfiles/file/77132672074.pdfIn PDF document text
    • http://phone-server.com/userfiles/file/bevixalijotemamirogigog.pdfIn PDF document text
    • http://nieruchomosci-swidnica.pl/userfiles/file/zupafobi.pdfIn PDF document text
    • http://matras-devison.com/upload/file/wopabebozawadat.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/22702182939.pdfIn PDF document text
    • https://lifetides.ca/cambridge/uploads/files/97228914474.pdfIn PDF document text
    • http://hnkingdee.cn/Files/file/20219108328.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=how+to+turn+off+auto+sync+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_off0000d4d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D9 10584 bytes
SHA-256: d21044f11555e2ba1d98e3d5c232c645595d8ea6277470968f01e0cf3ebed6d8
font_01_sfnt_off0000ed30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED30 17644 bytes
SHA-256: 17f60a70c5fcfd8b6d6385f35d4f082393ba5d29d62c3ce4982ab701e91dd34d
font_02_sfnt_off00011adf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ADF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1