Malicious PDF — malware analysis report

Static analysis result for SHA-256 c00fe78ed4a8fed3…

MALICIOUS

PDF

69.5 KB Created: 2021-09-21 00:57:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: a09a3799954d5a9b1ccbdca5215a07c6 SHA-1: 675aa2d200c129ca96c786d674f49606acd86e06 SHA-256: c00fe78ed4a8fed3db4e5afaaf4426632c9cf2ef0654dd228505ffbd9f9ea42d
156 Risk Score

Malware Insights

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

The file is a PDF that contains a link farm, directing users to multiple external URLs. Several of these URLs point to compromised WordPress sites or disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to lure users into downloading further malicious content or visiting phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://www.drivingschool-brno.cz/files/files/tosekuxati.pdf In PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16139f546533e0---xomelu.pdfIn PDF document text
    • http://aibrpjoaae2.specialty-match.com/upload/files/muvomoditamoxa.pdfIn PDF document text
    • https://locoffice.ru/userfiles/file/kisinagulumexowomenaxaret.pdfIn PDF document text
    • http://erodiertechnik-wenzel.de/userfiles/file/kiniz.pdfIn PDF document text
    • https://giaynangchieucao.com/userfiles/file/30893930702.pdfIn PDF document text
    • https://mb-classic-service.de/userfiles/file/99907041290.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137288ed5ec6---85251855963.pdfIn PDF document text
    • http://rnralpha.cz/res/file/71769023565.pdfIn PDF document text
    • http://xn--9w3b11kh5l.com/ckupload/files/tuxipirevoxojofipilul.pdfIn PDF document text
    • https://nls.vn/upload/files/10360588314.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614265cbd78dd---gasexanajebodemixekik.pdfIn PDF document text
    • http://formel1vermietung.de/userfiles/file/99622728938.pdfIn PDF document text
    • http://wlpp.net/images/blog/file/musenupelanasusa.pdfIn PDF document text
    • http://hydrogears.com/survey/userfiles/files/jaromewaxadiduribopapuf.pdfIn PDF document text
    • https://suadienlanhhanoi.net/upload/files/31601139989.pdfIn PDF document text
    • https://edubox.mn/uploads/users/0/files/durobuwalerabaweta.pdfIn PDF document text
    • https://888nv.ru/userfiles/file/tisoxibepifemedemotuwake.pdfIn PDF document text
    • https://viettincapital.vn/upload/files/poferexajiwumirazudabe.pdfIn PDF document text
    • http://craftland.de/res/wysiwyg/file/ketisivevuwobolusukut.pdfIn PDF document text
    • http://villacappuccina.com/userfiles/files/mukemapupa.pdfIn PDF document text
    • http://mamnonsaokhue.vn/app/webroot/files/ckfinder/files/lolenur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=download+game+gundam+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_off0000b2d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2D6 15112 bytes
SHA-256: 9a7e403851e95c60214964fa220a8c973740188f289ee1995a5d9b45d62099ca
font_01_sfnt_off0000d92c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD92C 10512 bytes
SHA-256: 2ed57a92aeae6338031a7c906341693a7db414f2f758b8c5f32a7f227e16ca8c
font_02_sfnt_off0000f0d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1