Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6f4b033652cef82…

MALICIOUS

PDF

100.9 KB Created: 2021-06-26 01:34:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: af3d938fb35b174e74db6ab7681a9e26 SHA-1: 9487cd63bd336e125948689b4e74fdcf54ff5783 SHA-256: e6f4b033652cef8284eda63c7a4ba60eb11256417c71d8108fbcfed9bcffbe72
196 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is identified as malicious by ClamAV and an ML classifier. A critical heuristic indicates a 'Clipboard command execution lure,' suggesting the document instructs users to copy and paste content into a shell. This, combined with numerous embedded URLs, points to a phishing or social engineering attack designed to prompt the execution of further malicious code. The presence of multiple PDF link farm heuristics further supports a malicious intent, likely to redirect users to compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9803

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://www.salpasafarit.fi/tiedostot/files/47430282170.pdf
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160c889c1885d4---76293147853.pdf
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/d6264c3a9d8bc0784dd7e8f87c77c481/13228351702.pdf
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160a23d39ad91e---tagifofujotavorewigedoxa.pdf
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7d8cdb14b---megagobedaxuwi.pdf
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606eeae002e2c---9786349270.pdf
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c596e88f298---movuforevanevejitixapan.pdf
    • http://cuadepthanglong.com/images/ckeditor/files/vovogimasafigusali.pdf
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/a9b75f96f9671fd3c2a265d54ef4369f/55536148955.pdf
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/3amtm02i81r268005inovi8in4/35252712409.pdf
    • http://guides2alpes.org/uploads/file/40721895406.pdf
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/evt0ggl3422cc7de7hurv5eo9f/35583548546.pdf
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3f36d61478---60667388737.pdf
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/c9e77d914d8b5cc33297e2aa29e8e9a0/fafivud.pdf
    • http://chatfieldfarms101.com/userimages/13721191997.pdf
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8a7cacd2dc---90840339248.pdf
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a6cc4985ad---fopibejorinoduton.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075c35c34ff8---sesapidamepuwu.pdf
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/e04d30e5f70745eca7540219d5f3d315/tefoj.pdf
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a416ba6a251---ratokopuker.pdf
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb33be4dd5---11120321061.pdf
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed2edf2ac7---91200050596.pdf
    • http://fontanarosaserigrafia.it/userfiles/file/67776012930.pdf
    • http://www.advokat.com/app/webroot/img/fck/file/gejibokix.pdf
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/pk74s28kp0qhnmv67c2n8cfe2c/27681384898.pdf
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087ec008221d---zilumuzalemid.pdf
    • https://cheatography.com
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=linux+cli+commands+cheat+sheet
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000124b9.bin
f93adb8fc737173da876ba1faedf0a503b17b17d962d58351ecf85d7e50506dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x124B9 10692 bytes
font_01_sfnt_off00013d0d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13D0D 16792 bytes
font_02_sfnt_off0001551f.bin
b8e8eff75a2688a8c50d99cac1725e49a366d1a757299f4f7f5c715986c9c99b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1551F 18464 bytes

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