Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef48ef375ac2cdef…

MALICIOUS

PDF

78.4 KB Created: 2021-09-21 23:08:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1af12b1824f35bbb1c6114bd2733881b SHA-1: 61336bb664e62f2701bd167be4669dc854f7c150 SHA-256: ef48ef375ac2cdefa0c4043531ddab36c52bf50ebaf4b6a8ad49e17dcd6b23c7
204 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of a 'Clipboard command execution lure' heuristic suggests the document instructs users to copy and paste commands into a shell, a common technique for executing second-stage payloads. Several URLs were extracted, some pointing to potentially compromised CMS uploads, indicating a possible distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://primaneighbors.com/userimages/tufenufolewogoduwalu.pdf In PDF document text
    • http://gpba.ge/admin/ckeditor/ckfinder/userfiles/files/tatejejonavejerimobowisa.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/34146512419.pdfIn PDF document text
    • https://pre-www.bridge-college.com/uploaded/ckeditor/files/59448632489.pdfIn PDF document text
    • http://combatkuntao.com/ckeditor/ckfinder/userfiles/files/93794784907.pdfIn PDF document text
    • https://phr4u.com/files/kenopeditunuvufow.pdfIn PDF document text
    • http://kryotherapie.net/neu/userfiles/file/pewiloxiboxureke.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141f0ec201a4---34337024959.pdfIn PDF document text
    • http://feuerwehr-mittenwalde.de/mediathek/files/40933657741.pdfIn PDF document text
    • http://creativetechno.in/userfiles/file/37777049529.pdfIn PDF document text
    • http://archiprojektai.lt/app/webroot/uploads/userfiles/files/19692062643.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/161345e30d7344---ligudedosomo.pdfIn PDF document text
    • http://xn--e42bt3l.net/upfile/files/biniwozomawidexik.pdfIn PDF document text
    • https://www.piramideidiomas.com/ckfinder/userfiles/files/70559513808.pdfIn PDF document text
    • http://honmamon-s.com/img_seminar/userfiles/file/jigekekanalinujerurom.pdfIn PDF document text
    • https://cuatudongsaigon.net/uploads/files/sologu.pdfIn PDF document text
    • https://seikai.jp/free_images/files/vugarekarizamupifipumivaj.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161472739b2016---74702872872.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=how+to+update+phone+os+androidPDF 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_off0000cd93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e5aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5AA 10620 bytes
SHA-256: de84e3239242bc686a6311fc040101ab8b27b4ce464eb940c68160768f8d9bb3
font_02_sfnt_off0000fde6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE6 18152 bytes
SHA-256: d60b9d101abe41efa8d70cc8338ad04dda83f5e41c169b9735b7038d94444d1a

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