Malicious PDF — malware analysis report

Static analysis result for SHA-256 0af6c890100c2668…

MALICIOUS

PDF

75.8 KB Created: 2021-09-05 23:26:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 59b7457fc20c83937759ea142ae18447 SHA-1: 4c17c81dce962188f74d2e24fd2f668eb08ed252 SHA-256: 0af6c890100c2668b70cdd7f58b0fcd6ad9dd9cd2cddb87a44496847d637b1cd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of multiple links on potentially compromised or disposable hosting reinforces the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

Heuristics 6

  • 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.
  • 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://sprostredkovanieuverov.sk/res/file/sebikutadivapugasisesi.pdf In PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16102d3e913055---24812068561.pdfIn PDF document text
    • http://studiopol.com/userfiles/files/fotafitozopib.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/70738410544.pdfIn PDF document text
    • https://incasur.org/temp//files/mitedap.pdfIn PDF document text
    • http://investin-khj.ir/ckfinder/userfiles/files/tinowelusunin.pdfIn PDF document text
    • https://alubiasdetolosa.com/files/galeria/files/muginaretuve.pdfIn PDF document text
    • https://jackyrouxmethode.com/userfiles/file/nosekoj.pdfIn PDF document text
    • http://grupophi.es/uploads/files/lokufowabilokiwijapoto.pdfIn PDF document text
    • http://liffeyartefacts.com/fckimagefile/file/96737245318.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/86cbd1a09a01ba77aa62002615160b8f/28959100344.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/perazexowivezuxufetob.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160951d9fc77a7---75126745844.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/04dd2508a253dc715de5cbb6df10f811/kotipapeval.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/b36e676796affd184617f3439c8de5a8/25896467143.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-5-17/20210517024746148497.pdfIn PDF document text
    • http://ibshop.gr/uploads/_uploads/files/tikeneretapirisalita.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/16084d0cb8dfe4---jitod.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16121a32899ca6---70165957170.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/486dd15de10f21617a73f8478b3d9c72/64274933605.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076228700616---rupizupururidu.pdfIn PDF document text
    • http://hevolta.com/upload/file/72026109455.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/c56b77fc977424bbcd454cb701d456cd/povito.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/2a9fc2147166923de09a8854db987cec/bejumizipabawiwamije.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9d8842e3f0---rogawosowodezexibunaji.pdfIn PDF document text
    • https://binarbaid.com/public_html/userfiles/file/femotuvazotamen.pdfIn PDF document text
    • https://investkwik.com/userfiles/file/78805447866.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=spot+publicitario+definicion+pdfPDF 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_off0000c4c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dcd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD8 10760 bytes
SHA-256: ecf303009dd255e6714ce60677d23bd0121fa9a1c3606dff82ee16fc20139664
font_02_sfnt_off0000f576.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF576 17248 bytes
SHA-256: 81a893fce62a6bec518e9143f617245b750a0e95a3f3693a7e5a4878cb71b48a

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