Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8f05dbf2e99c642…

MALICIOUS

PDF

128.1 KB Created: 2021-07-27 17:43:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 27ee2725cc192b752b96ac3bed7bdf66 SHA-1: 6caaea994d8359eb3b0c0e37731db98e4a99a292 SHA-256: d8f05dbf2e99c6421a3a4b6e921bfe4516c828cc9c09808dc679acc3eaac6d71
196 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a 'clipboard command execution lure' which instructs the user to copy and paste content into a shell, a common technique for downloading and executing secondary payloads. The document also hosts numerous links on compromised WordPress sites, suggesting a link farm used for distributing malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/f2b7d8c7c217c4b0601eb35f6b93bab6/29406299171.pdf In PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/f1cbb6e4c48a8119c8b98fdfab2ec53e/fevozuzubal.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/ada803a0bb5a41c7c60145b4ae86e9f7/52805649898.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b84dd9c3503---vejefokafumexi.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608335659c21f---birivamojepuxuse.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16081f5788e870---vuzupirawamuw.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608eb74c9305a---liwonefotelesus.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/882328ccf542cc89ef652b44f21e61e9/22409243306.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/dejonuzatugotegibono.pdfIn PDF document text
    • http://allnatureint.com/userfiles/file/ravux.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/fuzaden.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160772d2fc0554---21409541776.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/tegulamivoxixamisadak.pdfIn PDF document text
    • http://cuacuontoanthang.com/media/file/dazalazalamibowazovitivob.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0e4f946ce---bivixezevewufe.pdfIn PDF document text
    • https://xigmatek.com/upload/files/xelubegozijo.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/7161208796.pdfIn PDF document text
    • https://indikino.com/ckfinder/userfiles/files/retomabatexipimuxawixol.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608f1eb63625d---nakadixesusiluw.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b35e5b7163c---92161871751.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd7b258804b---zegokuvom.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607af7cf92eb1---44622017432.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=pokemon+fire+red+extreme+randomizer+nuzlocke+downloadPDF 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_off00018e97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18E97 18776 bytes
SHA-256: aa1dfb757d9d6623e8bdc6b77812efc5556f3e3f2ee1df826b402acf98866b62
font_01_sfnt_off0001c03c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C03C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001d853.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D853 10912 bytes
SHA-256: ca7c49ebed56dc246d58cbb47d2bd66fd41127351fe675f0732750cc8a30efc7

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