Malicious PDF — malware analysis report

Static analysis result for SHA-256 43eba043e6e63fc6…

MALICIOUS

PDF

72.0 KB Created: 2021-09-08 02:42:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9ea040451bd1ab0e9f6097dc72171293 SHA-1: 7abcc69dce5f90e8bb22c7dfdf6872d0e3086337 SHA-256: 43eba043e6e63fc6aff10e06a7b3c5295d180deb8f5525acf9b78d70a69b4578
196 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a remote-support tool lure. The document likely aims to trick the user into downloading and executing a secondary payload, potentially via one of the numerous embedded URLs pointing to compromised or disposable hosting. No scripts were extracted, but the PDF structure and embedded URLs suggest a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://art-lan.ru/uploads/assets/file/80362927808.pdf In PDF document text
    • http://heatexchangersolution.com/upload_fck/file/2021-8-14/20210814180030606542.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160b1ee61d0aa7---80811415691.pdfIn PDF document text
    • https://computerzone.pk/file/9976918741.pdfIn PDF document text
    • http://stratford1980.com/clients/1/19/19838be1bbe5684469623718d5e25b5d/File/vesamawusamizina.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/56929966745.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/5eginmkfes5p5oqt6jrtnsf4dh/59279782474.pdfIn PDF document text
    • http://stavclearing.ru/upload/files/42567907037.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/1d7bb951439ddcd2fb1a0cd6b82ffd2e/numedukusulilarutep.pdfIn PDF document text
    • http://fkhd.cz/data/img/97037435384.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/7169db5807e08b867dd22c23ff8a7015/60363504105.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135a44b047c8---98041587288.pdfIn PDF document text
    • http://ducthoaudio.com/upload/files/41885322301.pdfIn PDF document text
    • http://starkhigh1972.com/clients/d/dd/dd83d6d7846a033806cdb512e10d7d7c/File/56980174055.pdfIn PDF document text
    • https://ecosolar-energy.com/piceditor/file/14018839623.pdfIn PDF document text
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/71364283146.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1607a2b7f08691---gizogadomifogopi.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/78c2b45c0a4c0194b5675962f89b14f1/75881283740.pdfIn PDF document text
    • https://digicpictures.com/downloads/vegalerimapo.pdfIn PDF document text
    • https://spvi.cn/filespath/files/20210810064713.pdfIn PDF document text
    • https://robert-zauer.cz/userfiles/file/taxexo.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/39ea48d47fb8c951124a75a4eb0dbe7b/roninuriregepefevow.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16094d01314831---46786204204.pdfIn PDF document text
    • http://kolaykanal.com/userfiles/files/46064675272.pdfIn PDF document text
    • http://alt-1c.ru/userfiles/file/89056650612.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=laws+of+thermodynamics+worksheet+keyPDF 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_off0000b626.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB626 10944 bytes
SHA-256: e3689e500bd5e7b81ec7fcf072bb43ad60964d585cc0ce9e4feb26bf9f6e82d4
font_01_sfnt_off0000cf74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF74 16812 bytes
SHA-256: 2a2b7cb43c9e36d75d06a57f945ce2f0053212177d039f3fb2b1ebcc2061f0aa
font_02_sfnt_off0000fa8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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