Malicious PDF — malware analysis report

Static analysis result for SHA-256 90df64fbc787d067…

MALICIOUS

PDF

73.4 KB Created: 2021-09-03 07:46:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: db19a02b5333fd212580c561f2941c33 SHA-1: 6f1d49198f6846ba3f392ce893b9d0d051d373d7 SHA-256: 90df64fbc787d067a6e5a2c425501bec57eb8c64362de7e92a6075f3a2c6b208
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF file contains a link farm with numerous URLs pointing to websites hosted on compromised CMS platforms, suggesting a phishing or redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or download further payloads. No scripts were extracted, and the document body was unreadable, limiting the analysis of specific user interaction pretexts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/7022cca522ce53a3b127a51d9bce9a75/zasekuxaru.pdf In PDF document text
    • http://benrassam.com/uploads/files/54749631753.pdfIn PDF document text
    • http://www.sun-green.eu/ckfinder/userfiles/files/57345771203.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/1324rnaupmlttm5h801dvq4483/19752985470.pdfIn PDF document text
    • https://toyotaautobody.com/ckfinder/userfiles/files/pepesotabipududole.pdfIn PDF document text
    • http://campbellelectronics.com/uploads/gonutokawelelobafesat.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4bc5c61d9---garezebufozobuv.pdfIn PDF document text
    • http://ongxoanhdpe.vn/upload/files/rubugafefafudiwu.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160bb374ecb61f---tifagazedegiwiregozonixif.pdfIn PDF document text
    • http://didopack.com/files/nefegazo.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/69267837585.pdfIn PDF document text
    • https://radio-aurea.eu/files/file/fanowusiravepanazin.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/le3sd79kk4r4n0ecokinh2t6po/99278610705.pdfIn PDF document text
    • http://movitecnic.com/ressource/site-image/files/58473584692.pdfIn PDF document text
    • https://inverpalmas.com/aym_image/files/42652494988.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161077f114690a---savaw.pdfIn PDF document text
    • https://uleiuri.ro/userfiles/file/23069227073.pdfIn PDF document text
    • https://learnrkbin.jugalbandiresearch.com/ckfinder/userfiles/files/19117458293.pdfIn PDF document text
    • https://aquatrustfina.com/userfiles/file/zitaforugojegu.pdfIn PDF document text
    • http://wxhsbl.com/ckfinder/userfiles/files/20210809_181957.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607a01e56f10c---vefosejozulodotupap.pdfIn PDF document text
    • http://studiotecnicodama.it/userfiles/files/14366302809.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=plankton+definition+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_off0000bc13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC13 10316 bytes
SHA-256: 0cc04876cfc386e16572640d408023c85d11f46c4f8b6f90c5749baa9aa56618
font_01_sfnt_off0000d36c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD36C 17020 bytes
SHA-256: 82411c6cba404a0f3f3ef3c5c2165504e12fa121995212aa56cbd994071e9e88
font_02_sfnt_off0000ffc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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