Malicious PDF — malware analysis report

Static analysis result for SHA-256 00833e766f9bb1a6…

MALICIOUS

PDF

81.8 KB Created: 2021-09-05 14:51:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: d87545c1bdd0a71959c9998e9c93f89f SHA-1: 7b0130fa0fcddd8c2d54d2fa69c4ca9911b4a5e5 SHA-256: 00833e766f9bb1a6dfaa35ebb6933ff15ab8b77a556611daa3e253fc62eb84d7
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://inwebjor.ru/uplcv?utm_term=difference+between+sequence+and+series+pdf PDF link annotation
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/lv14hs6v2qprl775ankqmfig01/wavutofiwil.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/remuzosogelegaxomufaba.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0b580c777---gulam.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160823035a5b8a---70076162284.pdfIn PDF document text
    • http://thy-environment.com/userfiles/files/86856104518.pdfIn PDF document text
    • https://pima-alarms.rs/slicice/file/28792910739.pdfIn PDF document text
    • https://hotnews.md/upload/userfiles/files/18624006703.pdfIn PDF document text
    • https://kimcert.net/E/file/23797374385.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/839178c41e1348eccdc60a713c3b04e5/waruwibodatutof.pdfIn PDF document text
    • http://kiko168.com/UploadFile/file/20210816225959073.pdfIn PDF document text
    • http://geoplan.su/userfiles/file/6797364642.pdfIn PDF document text
    • http://positiveforce.in/uploads/files/wojabosobeda.pdfIn PDF document text
    • http://kangmeideyiliao.com/uploadfile/file///2021082520524347.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/8c28910bb2095ad8a629eed10e33e878/92915954922.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0948b1e7f5---milororadig.pdfIn PDF document text
    • http://www.jokilaaksonratsastajat.fi/file/tunere.pdfIn PDF document text
    • https://hostingyuvasi.com/calisma2/files/uploads/36680149713.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606c788c196b3---pigojonabezupero.pdfIn PDF document text
    • http://www.motocams.cz/ckfinder/userfiles/files/16038404524.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/94e572c2a1e625b14ef1e038c50d4ed6/damudebiwob.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1610db254a4ca1---banetexixufegafiwegibimu.pdfIn PDF document text
    • http://1970fchs50thclassreunion.com/clients/1/19/19770213778af891f1b13fa25f964f50/File/vesudu.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/0d7cbb9f1e68cf443e6d1ec556a96779/5509028978.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/81f6e9652bf19f9140ed73f9d2f377eb/bizigudaxalefesom.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609655759559f---53597695465.pdfIn PDF document text
    • http://librojuridico.com/aym_images/files/78278077722.pdfIn PDF document text
    • 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_off0000dac5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC5 17260 bytes
SHA-256: 8afa0e7fe5a3ca8239b33b02e520d30dee97970403f37f6ada1fd43ce2df2c8e
font_01_sfnt_off000107f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F0 10920 bytes
SHA-256: 6617c1a0f47a27fecef36c6eb16abe31703548d5cb5cc630148f9fb2e3eee800
font_02_sfnt_off0001210b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1210B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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