Malicious PDF — malware analysis report

Static analysis result for SHA-256 c00d9c40a64c2086…

MALICIOUS

PDF

96.6 KB Created: 2021-10-14 03:55:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: 91d70a55fa40911da69b4a36b475e991 SHA-1: b6443e9f5d3f4a7c5241bde34518eede98b2f7c1 SHA-256: c00d9c40a64c2086b15ec1b69e83cef6e629c8446ada751d2e87824b3563a2b2
164 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to other PDF files hosted on various domains, indicating a link farm or redirection mechanism. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing malware. The presence of a 'download button' heuristic further supports the idea that the document is designed to lure users into clicking links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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
  • 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://coretry.ru/uplcv?utm_term=ielts+academic+task+1+sample+answers PDF link annotation
    • http://apex-architect.ru/images/file/56689703513.pdfIn PDF document text
    • https://www.aukuras.org/ckfinder/userfiles/files/xixil.pdfIn PDF document text
    • http://datacomsystems.cz/userfiles/file/dotadu.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bfe53318ef---motimarabu.pdfIn PDF document text
    • http://gpba.ge/admin/ckeditor/ckfinder/userfiles/files/13323257325.pdfIn PDF document text
    • https://semagro-msw.ru/pics/images/file/88339996968.pdfIn PDF document text
    • http://nepalbestcargo.com/userfiles/file/99949841867.pdfIn PDF document text
    • https://aokman-drive.com/d/files/14868939481.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/489d6e7027d8ad3ca0f76aa01e9448d1/jalalep.pdfIn PDF document text
    • http://thanuyentea.com/ckfinder/userfiles/files/nubokaroxukixegabaxele.pdfIn PDF document text
    • https://sentralperdana.com/file/82233109328.pdfIn PDF document text
    • https://alariel.be/userfiles/file/36769593931.pdfIn PDF document text
    • http://trevelsi.ru/ckfinder/userfiles/files/winumazupige.pdfIn PDF document text
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/21788892516.pdfIn PDF document text
    • http://ume.civilkozpont.hu/uploads/file/42226104642.pdfIn PDF document text
    • https://nazragame.com/calisma2/files/uploads/40416604244.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615ee581d49ef---21605841902.pdfIn PDF document text
    • http://cesarrodarte.com/userfiles/file/87445949609.pdfIn PDF document text
    • http://xn--j1aii.su/userfiles/file/rakasozatomuwatinuge.pdfIn PDF document text
    • http://galenbio.com/images/upload/file/taxapegudewomux.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/76643617232.pdfIn PDF document text
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/fivovosipig.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20211004201210.pdfIn PDF document text
    • http://ohana1bbq.com/uploads/files/nizixexukelulupinefidi.pdfIn PDF document text
    • http://tinavaron.com/ckfinder/userfiles/files/8108101682.pdfIn PDF document text
    • http://lamachine.nl/userfiles/file/gikadinokojuku.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_off0001112d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1112D 10736 bytes
SHA-256: 9c389f1aa29096743ee72f191298758900adb78793483e7b99b611e1c4d30326
font_01_sfnt_off000129e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000141fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141FA 19332 bytes
SHA-256: 288f3971c654f14a2340a382a834b0f47c526b2c70a5b5c255d82ccfa8c2872c

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