Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7665a4bfe3a4d24…

MALICIOUS

PDF

108.0 KB Created: 2021-09-04 05:10:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 703bad3ab99bdaf981738e73ee985c1c SHA-1: 040738d594ddc53807b2808eba9fc06e366fa2ff SHA-256: d7665a4bfe3a4d24781e640b93e6aaffb6b10dbcfb8b01401fb31b9124ac4e66
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external sites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, indicating the PDF's primary function is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://medvor.ru/uplcv?utm_term=speed+of+light+and+energy+of+a+photon+worksheet PDF link annotation
    • http://kuppersbusch.hu/userfiles/files/womigerufo.pdfIn PDF document text
    • http://ladyqueen.it/userfiles/files/63586035397.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/sukifokok.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ac15c1c82d2---pisud.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b03aaf0cf9---34662844596.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/83ba483a1c7819dcf9d11b58d0333e40/gojeke.pdfIn PDF document text
    • http://gaestehaus-am-erlkoenig.de/img/editor/file/vepuzijida.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610091dbd57d0---83916851825.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/6347d146ccd577505bcc5fdbe80346ba/talujowo.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/xasudobowejolas.pdfIn PDF document text
    • http://cukiernia.eu/upload/files/88014247851.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/j88ggvik7rhm8h9uf2eni7u8sh/33762937457.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/1hi24l7vvbkjc90bvd3uujs6sa/89612225950.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/56786400965.pdfIn PDF document text
    • http://chieucoingason.vn/files/65807936882.pdfIn PDF document text
    • http://carbontuning.ru/file/29798452620.pdfIn PDF document text
    • http://onishi-kyosendo.jp/archive/diwilatimosefojigezi.pdfIn PDF document text
    • http://crmrealty360degree.in/ci/userfiles/files/kixodikedavuviba.pdfIn PDF document text
    • http://0965818789.com/CKEdit/upload/files/gegadu.pdfIn PDF document text
    • http://neilreardon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rupojetatumim.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/e5bce455ade99cb7998f5860206be0d7/60895536637.pdfIn PDF document text
    • http://tykhestudiodesigns.com/clients/7/73/7311521ca682816632878891c231d107/File/mevapeposozesidinuzamele.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac85853af26---duwobawokav.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_off00013d32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D32 19516 bytes
SHA-256: 8bedde0ce1ff883752bc850f24ac7a8b45bd4a52e5c9efd6d6ba0c518d73b278
font_01_sfnt_off000170e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x170E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000188fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x188FA 11144 bytes
SHA-256: 9aa010839ce3d9c53a4413f3e9618ef4415d849eae84eced7801af5f4b1ac9e3

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