Malicious PDF — malware analysis report

Static analysis result for SHA-256 804fb0d74a366980…

MALICIOUS

PDF

70.6 KB Created: 2021-09-28 06:14:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c2827b05826d6f7ad765ef08219424da SHA-1: cbe893835c447d5d7a7550a8baff648d82cf31c2 SHA-256: 804fb0d74a3669808d86e5b52767eb2c5a00e0f3fd210cfb2a95aa8f341a03f5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity, likely leveraging embedded JavaScript for redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://allytemp.ru/uplcv?utm_term=how+to+recover+my+phone+contacts PDF link annotation
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613332c2ccb38---72794944733.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d08734ec2a---54523048954.pdfIn PDF document text
    • http://tensoinox.com/userfiles/files/kugaworofib.pdfIn PDF document text
    • https://rajaunited.com/contents/files/lakeju.pdfIn PDF document text
    • http://ksiclubbiz.ksiclub.org/svnprojects/DHD/Source/images/files/15100012671.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134af744c200---nasimabowup.pdfIn PDF document text
    • https://cungcapthitdetuoi.com/app/webroot/files/images/pages/files/35392071225.pdfIn PDF document text
    • http://air-separation-supplier.com/d/files/varivunevezegogodukobag.pdfIn PDF document text
    • http://22vek-omsk.ru/fck_editor_files/files/30788346279.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/qooq515imkcgofirn0caf1qa7c/22409501975.pdfIn PDF document text
    • https://gitteszoneklinik.dk/ckfinder/userfiles/files/navenusetid.pdfIn PDF document text
    • http://ipmarketing.net/FCKeditor/editor/filemanager/connectors/userfiles/file/bezifusidenalaxiveku.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/f4ee7d851ca1dadec20e287319d26b5c/93307099368.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/pewidilixem.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/317953e55ef703cfdb849101c4abb02e/rekaboxaronovadogewa.pdfIn PDF document text
    • http://furniture83.com/upload/files/xejivuwep.pdfIn PDF document text
    • https://faktxeber.ru/resimler/files/67118773412.pdfIn PDF document text
    • https://chambres-hotes-aube-bleue.fr/userfiles/file/89175137706.pdfIn PDF document text
    • https://tezerwatch.com/file/upload/files/09-25-01-53-06-40.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/feccc8f35d91bc260c737df9f7d6cbc3/88464274751.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad7c42615b---gekowixakofudesumusisanan.pdfIn PDF document text
    • http://avanti.pl/userfiles/file/mosunes.pdfIn PDF document text
    • https://strongpointmarketing.net/userfiles/file/40461580590.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_off0000b38b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB38B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB9D 15208 bytes
SHA-256: db52ae65c6e964d222767f431df0fbc526632431a26bde52d0652c346bd3239b
font_02_sfnt_off0000f23c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF23C 10756 bytes
SHA-256: 270c97b802962c16de23fc151378b0358156fc8392720142f5bced8e63458ea8

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