Malicious PDF — malware analysis report

Static analysis result for SHA-256 37174325aed6c2d6…

MALICIOUS

PDF

87.6 KB Created: 2021-09-13 08:02:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ea590e4ba25444a8d25cf39c37174644 SHA-1: adb7b5462568ce8cf8388c23687769c884525b5a SHA-256: 37174325aed6c2d60165c9a8f00b18e0d9a6e1f3d07550d2df7f748e9cae6be7
196 Risk Score

Malware Insights

MITRE ATT&CK
T1059 Command and Scripting Interpreter T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV. The 'SE_CLIPBOARD_COMMAND_LURE' heuristic indicates the document instructs users to interact with the clipboard in a way that suggests command execution. The presence of numerous URLs, many pointing to disposable hosting or compromised CMS uploads, suggests a phishing or malware distribution attempt. The document body is heavily obfuscated and unreadable, but the heuristics strongly suggest a malicious intent to trick the user into executing commands.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://7m-shop.com/userfiles/file/bubalupugaxukuledutaxusu.pdf In PDF document text
    • https://marwaautorepair.com/nbloom/fckuploads/file/62250799490.pdfIn PDF document text
    • https://brawlcall.jordanadams.com/ckfinder/userfiles/files/37782465357.pdfIn PDF document text
    • http://tcyy88.com/userfiles/file/2021090622553973499.pdfIn PDF document text
    • http://kruengrangthai.com/files/files/demano.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/podopisek.pdfIn PDF document text
    • http://vce34.ru/attachments/file/venufukawu.pdfIn PDF document text
    • https://truckforceone.com/upload/editor/file/tarepuxinedokegafigeres.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/xogexibubatogimibewaxak.pdfIn PDF document text
    • http://naturestuff.nl/siteimages/file/lafidesalufawodomekupivo.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/05176e5631bbcdcdb768458740b486af/retuxosizomigugug.pdfIn PDF document text
    • http://turksebruiloften.nl/userfiles/file/30317031026.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1613d826e3f422---41397800961.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613da24c66f55---35524472373.pdfIn PDF document text
    • https://hahapediatric.com/uploads/files/202109011212293118.pdfIn PDF document text
    • https://plewmal-d.com/Uploads/files/varumotarefako.pdfIn PDF document text
    • http://yao-cheng.com/uploadfiles/20210905113718.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16133fc5253e74---1597923283.pdfIn PDF document text
    • https://crmsaas.dswip.com/ci/userfiles/files/93452120824.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613e9f50842ac---45535658320.pdfIn PDF document text
    • https://webmakler.org/userfiles/file/37863351182.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/bdebd1d13c254736f4311fd3fe13222e/nonavutiganatubofaseraze.pdfIn PDF document text
    • http://i-akparat.kz/ckfinder/userfiles/files/kaxajib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=sleeping+dogs+ppsspp+iso+file+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_off0000ef7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001078d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1078D 18648 bytes
SHA-256: fb9a822ea95a3fa892d6cbabe562dbca6a45f3f2439115925514064885d8e35f
font_02_sfnt_off00013800.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13800 10636 bytes
SHA-256: 400015484e71fefbf91e9da80cd7b415e8605aec60c88f0f3d1c2813cbde2c61

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