Malicious PDF — malware analysis report

Static analysis result for SHA-256 08cf231cfaeea116…

MALICIOUS

PDF

94.6 KB Created: 2021-09-07 20:15:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3c6a8dfe1300fcd829b6333edcb08e15 SHA-1: d0204af51d00e7e1075dc87d1468685514ab1d9a SHA-256: 08cf231cfaeea1169f3b37d6ab56bbea3ef30f33ee9b594651f5448489e64ed3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The presence of multiple URLs pointing to compromised CMS uploads and disposable hosting suggests a link farm designed to obscure the final destination, likely a phishing page or malware download. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://lawtutors.co.uk/js/ckfinder/userfiles/files/monatenikavogawezeko.pdf In PDF document text
    • https://appfacile.it/file/savovutesu.pdfIn PDF document text
    • http://centronegozi.com/public/jawuxanunedago.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/09mtapen8dmg2jeed626rcsbhu/kevovetedobafi.pdfIn PDF document text
    • http://hrzservices.com/uploadfiles/file/valaxupubuwisaruxura.pdfIn PDF document text
    • http://tfforming.ru/d/files/waxosasegan.pdfIn PDF document text
    • https://callmarkinvestments.com/callmark/files/13658861009.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c3d485e4615---buxiwigorobijikewoli.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16107efd17c666---96631484529.pdfIn PDF document text
    • http://daisin1977.com/js/upload/files/vuzuzozowelunejusapibuzu.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ac809c3a253---sanixukerexuxibepujotiz.pdfIn PDF document text
    • http://starlightcelebrates.ca/clients/4/43/43e9139217482d7666ce300faf566241/File/xozubanosirumilavigidiwa.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/b00b7aa2ac9212fd7b211a280c3a86cc/99488294439.pdfIn PDF document text
    • http://yao-cheng.com/uploadfiles/20210722124239.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/fixota.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/d5ef98c27f298a5f9939133b13dae85d/jurivugunogozenajibij.pdfIn PDF document text
    • http://ekonopuntos.com/campannas/file/pevojigepazexurizomen.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/48342702da6a97f452e3c220fce46f4c/27261415482.pdfIn PDF document text
    • http://bekkercoon.ru/ckfinder/userfiles/files/suvesunulurub.pdfIn PDF document text
    • https://elmawadah.com/userfiles/file/34844894282.pdfIn PDF document text
    • http://yakutiaprime.ru/SITE/files/editor/file/ximidip.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160828984cfc00---doxumugunoxemixajepi.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/7e01c4e03a6e0986fc1a11fb7ff50424/27772468801.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/sipiwemifikafufisapagoma.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a5f3e25c8---89660463018.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=saris+solo+bike+rack+manualPDF 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_off00011014.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11014 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001282b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1282B 10700 bytes
SHA-256: a23b22a8470686e38fc8a04841c996eb9acf2e9a9fa27872e47093d282695c29
font_02_sfnt_off0001409c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1409C 17044 bytes
SHA-256: d8a7dae7dda435c8582bdb44a21e9ea25db9e9ab01719f27b59d22ac18414d0e