Malicious PDF — malware analysis report

Static analysis result for SHA-256 e54788774e3a700e…

MALICIOUS

PDF

71.3 KB Created: 2021-09-28 04:02:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b3b5955fdbe914a3c135f66e2aff99a1 SHA-1: 304f53f502c2a2cac64c4c53a033ef7d92d1bd0b SHA-256: e54788774e3a700e30cc9b71ef0ba8074d0a7f41958b5ac8db0b0fe9c5963c86
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the nature of the links and the PDF structure point towards exploitation for client execution, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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 http://thuonghieutoancau.vn/uploads/files/begaxilegexokifinu.pdf In PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/96ff63a5dbe082aa4087b4c75f2ca683/88116209354.pdfIn PDF document text
    • http://www.scea.edu.mn/ckfinder/userfiles/files/79119989374.pdfIn PDF document text
    • http://americandeliorder.com/uploads/files/sefujuwixujijufetam.pdfIn PDF document text
    • http://uran-berlin.com/userfiles/file/pepejuv.pdfIn PDF document text
    • https://truongthanhco.vn/webroot/img/files/pagofe.pdfIn PDF document text
    • https://find-domain.lazy-online-shop.com/app/webroot/userfiles/files/17664740447.pdfIn PDF document text
    • https://www.le-domaine-de-hauterive.fr/ckfinder/userfiles/files/xutaxujepovufate.pdfIn PDF document text
    • https://gikguamerica.com/userfiles/file/1699583235.pdfIn PDF document text
    • http://m-s-g.ru/userfiles/files/10522677272.pdfIn PDF document text
    • http://aalzkj.love-mrt.com/upload/files/sojakukixi.pdfIn PDF document text
    • http://studionegrelli.it/userfiles/files/nikuburi.pdfIn PDF document text
    • https://ourlady-schools2.com/userfiles/files/7979586747.pdfIn PDF document text
    • https://migger.dk/userimages/file/juninadamolamup.pdfIn PDF document text
    • http://grafitym.kz/files/file/bitemiferibasedu.pdfIn PDF document text
    • http://ttworld.hu/uploads/content_files/files/5516943594.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/vozejubotuzivuseramemem.pdfIn PDF document text
    • http://erbamedica.org/userfiles/files/bakovaweteba.pdfIn PDF document text
    • https://inc.pamlskovnik.cz/ckfinder/userfiles/files/riximowu.pdfIn PDF document text
    • https://interativacorretora.com/fotosempresa/files/gapezadozevox.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/eba548053695b37bd9bef6fc35fa9b0f/mudiliw.pdfIn PDF document text
    • https://interstudy.net/userfiles/file/82200034762.pdfIn PDF document text
    • http://haciogullari.com/depo/sayfaresim/file/29180842197.pdfIn PDF document text
    • http://tw-echen.com/uploads/files/202108312057356107.pdfIn PDF document text
    • https://akemi.ro/hirek/file/55535465848.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3f9ad5e7f---75207185240.pdfIn PDF document text
    • http://rc-modeller.se/images/file///keridixe.pdfIn PDF document text
    • http://www.smartusb.info/images/library/File/momelima.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=remove+shadow+from+photo+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_off0000b6e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6E5 10916 bytes
SHA-256: c20e1f791da1bd2e6807d9e3d381aff6fae92332f7eee713efb81b353d11fe10
font_01_sfnt_off0000d00f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD00F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e821.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE821 15428 bytes
SHA-256: 387a65a3f1c70acb63a79f6a565fa35ea0e46bb0e357f7a1087748e28f89a0a0