Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3628a511ab3b8a8…

MALICIOUS

PDF

72.7 KB Created: 2021-09-05 16:54:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 67f63af05a111a074bbad4137af1dbf2 SHA-1: 708c6a424109ecd6d6460eb937bb8fcff6d208b7 SHA-256: e3628a511ab3b8a80224e2c9134694d8c804c6c37da56c2c007952e03af999e3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised CMS upload directories, suggesting a phishing or malware distribution lure. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the overall structure and URL targets strongly suggest a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160d83c0c55462---nodegenonekuvege.pdf In PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bceef8545e3---24752416894.pdfIn PDF document text
    • http://daydreamspin.com/userfiles/file/rudipebanusopuwav.pdfIn PDF document text
    • https://andana.us/files/files/44022557581.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/budonib.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/730g60cgm56lp9i5glpcs8faqv/21625149020.pdfIn PDF document text
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/notulupalodusudivibatu.pdfIn PDF document text
    • http://sdds.be/userfiles/file/nizeferomelabiribupus.pdfIn PDF document text
    • https://casadko.fr/userfiles/file/75584806416.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/4t073vgie3adggndd63to6fto0/632240043.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16092d645d6f1d---63116493396.pdfIn PDF document text
    • http://trustarshida.co/cache/fck_files/file/lokodiz.pdfIn PDF document text
    • http://datev.hu/ckfinder/userfiles/files/megobezijivodovad.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/15515946854.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/0e3e63067b7f67dddf15bf9edae9a270/52489274289.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/k0cpqdms3llfuv7p8vn2ujf4v2/tusufewedigigunenuwukafa.pdfIn PDF document text
    • http://kojeneckezbozi.eu/userfiles/file/jatitigedojifanisebuwo.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/16119d433c12b4---soxulerofizabixoduragat.pdfIn PDF document text
    • http://bjjiffy.com/upload/kidejufiduzukojasixele.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a4eecb1bab7---83916056935.pdfIn PDF document text
    • https://shreenathtechnologies.com/userfiles/file/21300955845.pdfIn PDF document text
    • http://macap.nl/app/webroot/files/userfiles/files/fosipabilugimi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=clarks+table+book+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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b93e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB93E 17344 bytes
SHA-256: 2fce8f0275428441ba9c59c20c921ff4a3ba979f00b9d567fd4a4f716007e62c
font_01_sfnt_off0000e59e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE59E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fdb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB5 10556 bytes
SHA-256: b83bece5e9cb5c8af3a0019f2d1837dc05aba7f9c5018849f5e90a68d31c16ca

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