Malicious PDF — malware analysis report

Static analysis result for SHA-256 63c39b00ee5bbca4…

MALICIOUS

PDF

80.6 KB Created: 2021-09-11 11:03:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3cb0a187405a6f440e82f4bc1d40bb6c SHA-1: a93d7ff864391b0cdb6546c39594720bad4ea912 SHA-256: 63c39b00ee5bbca47edb80505f70921665d57afc7f21d2176c532969e0cc5915
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple distinct hosts, some of which are 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 0.9833

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://magyar-logyogyasz.hu/fileok/file/semojuritixisemozadodaz.pdf In PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16130dc17ce78e---vazudaluwufoparukopamowan.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613bea6a13716---20560221194.pdfIn PDF document text
    • http://trivio.it/userfiles/files/zukotitapatobujojiveku.pdfIn PDF document text
    • http://affordableadobe.com/ckfinder/userfiles/files/23105482093.pdfIn PDF document text
    • http://emploi.nat.tn/ckeditor/ckfinder/userfiles/files/rewizigiraxituwalijag.pdfIn PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/laguxidefifuvexaxojowinuk.pdfIn PDF document text
    • https://vgi-vn.vn/app/webroot/img/files/mudonelegopisikub.pdfIn PDF document text
    • http://mynotary.ca/sites/all/sites/mynotary.ca/files/56869914851.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/misogojamanaverox.pdfIn PDF document text
    • http://kondicionery-domodedovo.ru/upload_picture/file/seponifegulifitogu.pdfIn PDF document text
    • http://go-pxl.com/uploads/files/53864481104.pdfIn PDF document text
    • http://cachnhietwin.com/luutru/files/zapino.pdfIn PDF document text
    • http://hoteldanang.com/uploads/images/files/35082318125.pdfIn PDF document text
    • http://timnhanhonline.vn/upload/files/bofor.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613a80ee38330---47292351725.pdfIn PDF document text
    • https://deepex.hu/hirek/files/rukokibipobotixamu.pdfIn PDF document text
    • https://ddtoyz.com/ckfinder/userfiles/files/zetove.pdfIn PDF document text
    • http://nage-z.com/ckfinder/userfiles/files/69024673791.pdfIn PDF document text
    • https://heks-tech.com/app/webroot/userfiles/files/muratabenijaxulo.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161308d1905f6e---44591254141.pdfIn PDF document text
    • http://olivetheater.com/userData/board/file/28386213164.pdfIn PDF document text
    • https://bomnuocebara.com/quangbasanpham/app/webroot/upload/image/files/ravunuwosijurob.pdfIn PDF document text
    • http://bekkercoon.ru/ckfinder/userfiles/files/75660637759.pdfIn PDF document text
    • http://giaphatmed.com/upload/file/wemokejarasisagamepuji.pdfIn PDF document text
    • http://okvin.org/userfiles/file/84562324489.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+transfer+itunes+library+to+androidPDF link annotation
    • http://louisiana-arts.org.s150269.gridserver.com/siteuploads/editorimg/file/74028093820.pdfIn PDF document text
    • 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_off0000d777.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD777 10780 bytes
SHA-256: 779b0678b7ffe042185fa27218129f166fa7ead286de019ce1a4c83c5e272df5
font_01_sfnt_off0000f070.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF070 17008 bytes
SHA-256: 956d4eee0c3b15a8b56c81e4494447ce7f2caf81ffbb90116c76b05e16d94994
font_02_sfnt_off00011c8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1