Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd3d8ca18d65bc09…

MALICIOUS

PDF

80.7 KB Created: 2021-09-08 12:05:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 75cc95101a0045ed40b6e9c0acbd6d7c SHA-1: 8451573d3d938ae2a1e70470112b1e2689ba5f4b SHA-256: bd3d8ca18d65bc09e2d1e8ad1d7dfae46e3badd5122e5b720c005cfe32f4343a
156 Risk Score

Malware Insights

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

The PDF file contains a link farm that directs users to multiple URLs, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of numerous links on disposable or compromised hosting suggests an attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://leesman.com/wp-content/plugins/super-forms/uploads/php/files/fecd6e5587dc8d29a1001ebdec0ce03d/valeja.pdf In PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/697ed9a5e87627b3d7f312e870dea0c2/lobofuvajajejazexafog.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/8331f9c99e358b9301e6cdcba2b7d571/titigapijokutim.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/aeafb511b62312eeb6a844a7fb7d0c23/52447035744.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160853df0bd27b---tanuteramipewanoxomut.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/09223ca13fc16789be35a58803efb99b/93375631486.pdfIn PDF document text
    • https://erdemlerkoleji.com/resimler/files/vubosub.pdfIn PDF document text
    • http://murphysbeads.com/clients/54316/File/rutowob.pdfIn PDF document text
    • http://topoint.cc/userfiles/fckFile/20210707190034.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b068f1e4695---95130059476.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/189723069760c872ac4e3c1.pdfIn PDF document text
    • http://eau-msu.ru/ckfinder/userfiles/files/50921613091.pdfIn PDF document text
    • http://aotwresort.org/ckfinder/userfiles/files/60992564136.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1607fcf6779162---mepuzupodis.pdfIn PDF document text
    • http://zonweringbelgie.nl/ckfinder/userfiles/files/guwunoteka.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/1225710093.pdfIn PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/psqufos5pth0lqo29brerhgmcm/12763232028.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/334a483df6967389422e05835ffe01b9/91836875035.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608056d6aed77---jorekanilojatasapatewite.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1607cfdf777271---kujazamole.pdfIn PDF document text
    • http://artc-polymers.com/upload/images/files/noravilak.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b02f1504bb7---71080615208.pdfIn PDF document text
    • http://kiapelhrimov.cz/UserFiles/File/15321205520.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=molecular+cloning+a+laboratory+manual+2nd+edition+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_off0000d269.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD269 18512 bytes
SHA-256: 8efd1f2b9143552093c91c78b1a84d8ac20278db4bc65eebfc378cb50bb231e9
font_01_sfnt_off00010266.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10266 11260 bytes
SHA-256: bf89990170ec221f12fb2ac644a44256449c17b2a328391bece1ba5c47bbf23d
font_02_sfnt_off00011c75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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