Malicious PDF — malware analysis report

Static analysis result for SHA-256 67bb544b5a25df5d…

MALICIOUS

PDF

154.0 KB Created: 2021-07-22 16:59:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: a83674e33fa5399f9c6e18d0d5ea86e4 SHA-1: 8443705cffc3a8d8363a9459d6acdf5f6268e791 SHA-256: 67bb544b5a25df5d30e169dca9be722cbd5cfa790d8b5f19bcdc5a304318c372
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The 'SE_CLIPBOARD_COMMAND_LURE' heuristic suggests the document instructs the user to copy and paste content into a command-line interface, a common tactic to trick users into executing malicious commands. The presence of numerous links to compromised CMS upload directories and disposable hosting further supports a malicious intent, likely to facilitate the download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://ehomeforeclosure.org/images/file/28270270617.pdf In PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/c0r4irt5jgl9eing2plqt79iv5/96360082031.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/7385cce0858ea2cbf0d75f4544f19c83/86304095235.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a4e6073d829---19491464256.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070238b5d8fe---46777809603.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/b7c1e0c0f67f3f75f09624012f3f3919/15790075807.pdfIn PDF document text
    • https://edebmachine.com/images/media/files/butubemejilofe.pdfIn PDF document text
    • https://securitegenerale.tn/userfiles/file/tuxedikasezoxelitukona.pdfIn PDF document text
    • http://volkshilfe-vlbg.at/images/content/files/77540956696.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083f8737431d---95918042032.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f65453689---megabasiriweke.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/e71jemtubrovb8ra5i356p8ipt/gokesepatog.pdfIn PDF document text
    • http://biomisszio.hu/tmp/kadebakunaliwuzupizupoget.pdfIn PDF document text
    • http://forresterfamilyreunion.com/clients/c/cc/cc72bfd2512333311cc1ef5a4fdef90f/File/29251506521.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/18818ff9d0e6de68da0ce58685dc5f77/xanajonamewiruxi.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/vovadujiledavijulovubop.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/16097fa51887a7---24548254473.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202107031036.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/08a2e1729e100b0780bb814c53b51a23/89611698952.pdfIn PDF document text
    • http://dytac.hk/userfiles/zukapedaradekizovekiwaj.pdfIn PDF document text
    • https://stgeorgedentalcare.in/ckfinder/userfiles/files/xasima.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/9je03h5buqkvvrsd5tnfj3dth7/jutofikewavatal.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/86115960233.pdfIn PDF document text
    • https://icbacademy.com/upload/files/vifupex.pdfIn PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/wupilekurusajamefexib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=solo+male+jacking+offPDF 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_off0001f435.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F435 21188 bytes
SHA-256: fba133a093c5db2f067125e1a0b17026e618ee929837d66d21b73f04c4b27cc1
font_01_sfnt_off000229b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x229B5 10608 bytes
SHA-256: ba325350620ea3731ed5159e6200ae16fea2d68d0b0c04b010f99cb3b506d8fe
font_02_sfnt_off000241e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x241E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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