Malicious PDF — malware analysis report

Static analysis result for SHA-256 8215d5f3f5df05ac…

MALICIOUS

PDF

70.8 KB Created: 2021-09-28 14:31:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: ee1fd0cf0a8db00c68a4fee7ae157002 SHA-1: 71e7477fa4c34b1e336e42272fcabe52fd06e920 SHA-256: 8215d5f3f5df05ac06579bfb7fa3a5f7cee7539f14e55545ed8dbed042d9b195
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The 'wkhtmltopdf' authoring application and the nature of the URLs indicate a potential for redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nomylo.ru/uplcv?utm_term=sd+card+and+internal+storage PDF link annotation
    • http://files.ibiza-ferien.de/file/44477595857.pdfIn PDF document text
    • https://drproperty.in/userfiles/file/lilujis.pdfIn PDF document text
    • https://plagij.at/ckfinder/userfiles/files/24291493077.pdfIn PDF document text
    • http://gjbbang.com/userData/board/file/78691968163.pdfIn PDF document text
    • http://enjoybowlramenandpoke.com/uploads/files/medenusizotakafopanezoz.pdfIn PDF document text
    • http://gidaero.com/upload/fckeditor/file/24004071370.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/ovdjmim3mv8eq00kvoejichldh/duzonizapebazofegen.pdfIn PDF document text
    • https://studiopros.com/userfiles/file/In PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ddb0184fbf---kojuriz.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/99619350707.pdfIn PDF document text
    • http://dongsimkindergarten.com/upload/files/73595074763.pdfIn PDF document text
    • https://xtremefitksa.xbodyksa.com/ckfinder/userfiles/files/60078767438.pdfIn PDF document text
    • http://shopcloud.cloud/ckfinder/userfiles/files/67049048681.pdfIn PDF document text
    • http://officinedesign.it/userfiles/files/86437278645.pdfIn PDF document text
    • http://fecirturizm.com/resimler/files/69492465541.pdfIn PDF document text
    • http://ydchem.cn/filespath/files/20210905134406.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16150040371d5b---5028580859.pdfIn PDF document text
    • http://solyaris.pro/admin/ckfinder/userfiles/files/74976100633.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/r733502vrqccig0osfutas4qet/zalupuroravebofukebiseto.pdfIn PDF document text
    • https://partnermind.cz/images/files/23686890732.pdfIn PDF document text
    • https://macintosh-szerviz-javitas.nuttydog.hu/ckfinder/userfiles/files/nisumunisonebezefitakune.pdfIn PDF document text
    • http://arcenevents.nl/site/upload/files/gulekinanebok.pdfIn PDF document text
    • http://sitarofindiamd.com/userfiles/file/45476262952.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_off0000b2ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2EE 10620 bytes
SHA-256: c0dc6c901d868ba5548ccfc9e3b80ccd5319834081f12f96dbd1b9d20faa1e8b
font_01_sfnt_off0000cb10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB10 16744 bytes
SHA-256: f60798218882088bd2587d746596b9e640adbd96210d3b2ae3bf7ce930ba9268
font_02_sfnt_off0000f549.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF549 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1