Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfe72a05e22f9d4f…

MALICIOUS

PDF

81.8 KB Created: 2021-09-05 18:49:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5b177ac2389cb163bd0ba6653cee1621 SHA-1: 8012fc0291141cdab9a36efa38ae26fbfedad3c2 SHA-256: cfe72a05e22f9d4f5fbf1785c5cd329f8b59dad2f3cb3a3fbcd0c0267d8ddb7a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or malware distribution attempt. It contains numerous links to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest this document is part of a phishing campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16108ccf89d43c---kumevuduwikali.pdf In PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/82e8feeb7269cb8a8d412e6cf4259523/85433211041.pdfIn PDF document text
    • https://hotel-la-licorne.fr/userfiles/file/lonatulaf.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/ktnjv5b0rsus2vavv6erl3gnrf/18962729759.pdfIn PDF document text
    • http://designbyjoseph.com/uploads/File/rokumewuliliporarejizom.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210528221625.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/zamomidovepapo.pdfIn PDF document text
    • https://profitaler.com/UserFiles/file/wojidefi.pdfIn PDF document text
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/didorezojasukumigit.pdfIn PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/pijutofuwetunavi.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ae458ca8c25---91335040376.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/1a88c0156231f03862aaf01164130de5/5752215694.pdfIn PDF document text
    • http://abbuffalowings.com/uploads/files/43276857759.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d759aca1952---fosizevomiporubuwu.pdfIn PDF document text
    • http://mentaplywood.com/images_upload/files/97647314035.pdfIn PDF document text
    • https://h1t-urlaurora1-turbo.com/contents/files/lidarejopemevedegufilumob.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/67469519836.pdfIn PDF document text
    • http://myshopekerala.com/userfiles/file/fazakipagusinam.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/2b9e1ef198536ba7895c1088829a118b/xovuwaxizesaper.pdfIn PDF document text
    • http://attlas.center/userfiles/file/fujupareparatiseja.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/d4102e1c57bb4ec55895dfe1f6241b42/68730237017.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609ea155a512e---notawabajadegefeguvixetoj.pdfIn PDF document text
    • https://digireg.nz/upload/96564553543.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/nawasaxaj.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/0pmv831mq9dcf6q44c40rfo5lv/zowupokiliwobufomodo.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1bd60419a---63778580925.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=bsc+agriculture+study+material+pdfPDF 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_off0000d845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD845 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF057 18312 bytes
SHA-256: 54eca3847d0088c109a3a1c8a2e74e55ecc35568b51a1904be7c1dc6c2846220
font_02_sfnt_off00011fc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC4 11008 bytes
SHA-256: 35cd7023f895c955dbba50045edef4fef1f7e267165522d716ea54eb6ed74bae

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