Malicious PDF — malware analysis report

Static analysis result for SHA-256 cee750eb9f354fef…

MALICIOUS

PDF

93.0 KB Created: 2021-08-12 06:26:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a1c90e856132ebe3b7e08472f148abeb SHA-1: 6b507c081e289851cf9dfab67589e4674d0df531 SHA-256: cee750eb9f354fef307cbb999bfd106c6bf819ea7cacf72e7ac0c531ae2ddf14
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm or SEO poisoning tactic. ClamAV detected this as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The embedded URLs are likely used to distribute further malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160740910dc4df---71135945668.pdf In PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/f42ff2a3afb2f85590e344e634062201/nubid.pdfIn PDF document text
    • http://musthighschool.mn/ckfinder/userfiles/files/goxazibimerusirimabiruz.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/99f8cd92dbe7b309d4d93749b791d3a6/4416077400.pdfIn PDF document text
    • http://centonze-vini.com/userfiles/files/xevumetonuxe.pdfIn PDF document text
    • https://xigmatek.com/upload/files/lapatekubizunosepew.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073807f84f21---beroxumux.pdfIn PDF document text
    • http://bogema.by/content/Files/15895291930.pdfIn PDF document text
    • http://nhasachthunam.com/upload/files/funapanolabidivezatovoza.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1609432f9b3255---32867050671.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/40ac765823e8314feb5a8e3109f45aa6/66726323033.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/90418258786.pdfIn PDF document text
    • http://geoodwierty.pl/files/file/2322577249.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079db6cb54d6---tefatojijumuwibedoremo.pdfIn PDF document text
    • http://phatnang.com/media/ftp/file/90424681363.pdfIn PDF document text
    • https://study4student.com/cache/fck_files/file/61265457901.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/0d8c4d7cc6bbab59d9091a8c71f45859/firok.pdfIn PDF document text
    • http://arcenevents.nl/site/upload/files/4993193819.pdfIn PDF document text
    • http://fw-simple.com/uploads/files/riwedeniwateg.pdfIn PDF document text
    • http://tomnhenryanderson.com/clients/8/8a/8a1068334c160bb49438aafe8043afff/File/jetopejemogozuzozixo.pdfIn PDF document text
    • https://cam-ceeds.org/ckfinder/userfiles/files/61494332190.pdfIn PDF document text
    • http://abwalabamaave.com/uploads/files/69548729758.pdfIn PDF document text
    • http://rymwid-training.com/userfiles/file/78126962511.pdfIn PDF document text
    • https://llsindia.in/FCKeditor/file/vosadexexuderu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=dragon+ball+z+shin+budokai+2+iso+file+free+downloadPDF 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_off0000f670.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF670 23296 bytes
SHA-256: cd015a4f4909d3fbab9961cc5b31f2a6fc146ea148d35795b3e05b4f050b0ddd
font_01_sfnt_off00013067.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13067 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001487e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1487E 11132 bytes
SHA-256: d883bb0c20cef8ec5c26410c24fe905dfe6aedf62ee17a4f3b986d5762f9af2c