Malicious PDF — malware analysis report

Static analysis result for SHA-256 40d68288f51f988d…

MALICIOUS

PDF

82.4 KB Created: 2021-09-02 04:24:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6e003fdd6e537b991137b5f32455b492 SHA-1: 374752821a26c2d4f13f8865de6f34f5d5627cbb SHA-256: 40d68288f51f988d879546e576da79976c28705e766eb7fa4cbebe9f9e0a3b4f
196 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier. The 'SE_CLIPBOARD_COMMAND_LURE' heuristic indicates the document instructs the user to copy/paste content into a shell, a common technique for executing malicious commands. Several URLs were extracted, some pointing to compromised WordPress sites, suggesting a potential download or redirection mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://kuzeyilac.com/resimler/files/10833875821.pdf In PDF document text
    • http://helpibr.org/clients/f/fe/feaff840d005acecac0f151e8679c8db/File/vidiziruf.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/c8b9de8fb4346f32c6d9cfb9f2cd390b/39629822805.pdfIn PDF document text
    • https://nepaltrekkinginhimalaya.com/assets/userfiles/files/patek.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160810d4fcbcf4---jiposewomufomizafipuva.pdfIn PDF document text
    • http://bualuang101.com/backoffice/upload/files/wovijuvitijujozabezabit.pdfIn PDF document text
    • http://pulsarvn.com/media/ftp/file/gavunojobosugutom.pdfIn PDF document text
    • http://gymostrov.org/gymostrov/userfiles/file/zivokajifabimawaduwo.pdfIn PDF document text
    • https://tuoitre.bacgiang.gov.vn/lib/ckfinder/files/84401675461.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/pif4s9gaqcjer7cv699krohar6/52680476638.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/94ba8598c20ec0d23eaa15e3f4641fe3/kajidijiligidigekok.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/bupukuwawapegakagif.pdfIn PDF document text
    • https://a-1commercialkitchenservices.com/ckfinder/userfiles/files/50554202482.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/1347fbb123c40c92b91f0ca4cafea48b/pogorerudobonodufipagu.pdfIn PDF document text
    • http://spoilersmensgolfclub.com/clients/865201/File/31313022910.pdfIn PDF document text
    • http://magendans.com/imagefiles/file/puxonajerevap.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/ecdf0ca580e456e2eece707156aba260/37215861697.pdfIn PDF document text
    • http://delfosventures.net/userfiles/files/zimalusupedojadopotal.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/msmirp32teghn5ilccihqorfe2/94353797191.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/b6fa70169f0226e36c457f45d28d20fd/mowolirepalowagijipukawu.pdfIn PDF document text
    • https://0a3exp.com/upfiles/editor/files/gesajekejusifimopidobim.pdfIn PDF document text
    • https://cam-ceeds.org/ckfinder/userfiles/files/famuvozugad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+use+format+painter+in+wordPDF 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_off0000dd05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD05 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f51c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF51C 10788 bytes
SHA-256: d34599bd3381168f05df7664e7412a9322b59aabf378f7b3ac51aab5fbbb6249
font_02_sfnt_off00010dfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DFB 17624 bytes
SHA-256: 159d2f61cd9e3c1358c624880acef3d3e3d455d8df7e54e64be723fd882c6338

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