Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9424b88c4867124…

MALICIOUS

PDF

80.0 KB Created: 2021-09-18 13:28:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 660c9adbb2be1e3cdc81bd0e71bd949f SHA-1: d5040530002211db954c7fc8d9209cbf9afe5998 SHA-256: d9424b88c486712462ba90e2307b888d666b1a872109cb53fa137576806ea71c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to other PDF files hosted on disposable domains or compromised CMS uploads, suggesting a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://garglob.ru/uplcv?utm_term=malware+apk+download PDF link annotation
    • http://andlupa.com/userfiles/file/nuxaxowobape.pdfIn PDF document text
    • http://pol2-simf.ru/userfiles/file/28792168254.pdfIn PDF document text
    • http://likebarcode.com/image/files/20210911_072901.pdfIn PDF document text
    • http://lulanjina.net/upload/files/levupijazunutuwotuzat.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/161444a61eefa0---vagewojixesogideze.pdfIn PDF document text
    • http://roycraft.ca/userfiles/file/56542274206.pdfIn PDF document text
    • http://skidubravy.sk/spravca/ckfinder/userfiles/files/bewiwobekop.pdfIn PDF document text
    • https://bahispesinde.com/gnc/veri/_files/72180227911.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///4105256280.pdfIn PDF document text
    • http://camel-republic.com/media/userfiles/files/zavago.pdfIn PDF document text
    • http://huijingweb.com/upload_fck/file/2021-9-15/20210915145642615642.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/365vol12ajv5srrhmf76io0ock/fubagatetuzer.pdfIn PDF document text
    • http://alphanaturehk.com/userfiles/file/netibiwabiviperogumakox.pdfIn PDF document text
    • https://rentcar888.com/uploads/files/202109090131311460.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140f35da6ec5---64808261820.pdfIn PDF document text
    • http://scea.edu.mn/ckfinder/userfiles/files/daverejuwukusawasumu.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/e0cadd299dd00abaa5c34f9ea450bca9/bumilopuladawigifikexises.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/zegepumos.pdfIn PDF document text
    • http://stellarp.com/userfiles/file/tisubuzujerajenawopaka.pdfIn PDF document text
    • http://dohertylaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/86949117130.pdfIn PDF document text
    • http://amsuatrust.org/survey/userfiles/files/digun.pdfIn PDF document text
    • http://ourconn.com/userfiles/file/202109041009564426.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_off0000d6c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C3 17632 bytes
SHA-256: 0f7fe0fbe64c23c6b0c51e0126b0721441a7e86e20e0ef5a552d5d2a2a580064
font_01_sfnt_off000103f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F8 10196 bytes
SHA-256: b859bb6278b35744b81cb34d01f542cbd1357d4b6878c6760a9cbaddd75496cd
font_02_sfnt_off00011af4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1