Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d720dd02ef91958…

MALICIOUS

PDF

89.8 KB Created: 2021-08-12 10:44:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b5a1f8645c4782cbd9a77bde5dfecc25 SHA-1: 4ecd632393a817a9347ba8cce74bd2b11f9ad879 SHA-256: 4d720dd02ef919586dcc5c4adabcdd15e80f4548aabac3cf3d8510fa021f8282
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to potentially compromised WordPress sites or disposable hosting. The PDF structure itself contains numerous embedded URLs, suggesting it's designed to redirect users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://kelvista.lt/images/files/8399769208.pdf In PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac62a4c98d6---pavanevuratisuzonid.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/71436497053.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a24ab80c1---durovenibofiw.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7516840637---pixix.pdfIn PDF document text
    • http://ideviceplus.nl/app/webroot/files/userfiles/files/bizubuzasevigididodejawi.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2e69ebec8---buvazeriv.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/tasejafufesalujenes.pdfIn PDF document text
    • https://cheesykeju.com/contents//files/98672142697.pdfIn PDF document text
    • http://rhondachem.com/d/files/nukezuletogadiriwifef.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/c4e0e4cb3104858754b7e66a8cb2c94b/20758545506.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/tiriwudideto.pdfIn PDF document text
    • http://tianfonmm.com/d/files/25309376139.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/duzenepevibawobezikejit.pdfIn PDF document text
    • http://sevoir.hu/uploads/file/zaserefuwupibilabotewom.pdfIn PDF document text
    • https://ebooksweb.net/files/file/gujovixojiz.pdfIn PDF document text
    • https://ngoctraithaibinhduong.com/uploads/news_file/74073530847.pdfIn PDF document text
    • https://bruceautoservice.com/files/file/risosamulesifowirabo.pdfIn PDF document text
    • https://mogilew.ru/userfiles/file/81971572275.pdfIn PDF document text
    • http://mysistermyfriendministries.org/clients/85776/File/lagan.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16078cffed4dd1---jolulileku.pdfIn PDF document text
    • http://ingpiazza.eu/userfiles/files/fezadi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=breathing+lessons+pdfPDF 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_off0000fa0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA0E 18164 bytes
SHA-256: 9017cb2e51e032dd61de2ef81fe07b4962424068fea77579ed989a698dafa8b5
font_01_sfnt_off000128c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128C8 10828 bytes
SHA-256: 29f871fddf75139b6550e29d669d9b0bc3da4a20c1868356a32ed04fcd22eaf0
font_02_sfnt_off00014180.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14180 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.