Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ccbc5cbdcb92cd3…

MALICIOUS

PDF

84.1 KB Created: 2021-09-04 04:57:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c147bdae5f21f3ee8da09ffa6ecedd8a SHA-1: 2fbdbff2c35b790c946cc7b734c5e351dab75797 SHA-256: 8ccbc5cbdcb92cd378b87d24c66743d047e2b33605576917e6dc542526e0a6c4
156 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 compromised WordPress sites, suggesting a phishing or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites or download further payloads. The presence of multiple link farms and the use of compromised CMS uploads are common tactics in phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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 https://irlanc.ru/uplcv?utm_term=virginia+henderson+biografia+pdf PDF link annotation
    • http://caopump.com/admin/userfiles/file/jegiwi.pdfIn PDF document text
    • http://clearspace-design.com/CKEdit/upload/files/vikadajejamusogubilena.pdfIn PDF document text
    • http://maksimetall.ru/files/jarixubususakiwojifikuwo.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/visagukelamasidofu.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/d289995e75ad24654eb23164ff478012/28058174440.pdfIn PDF document text
    • http://capitaldanceacademy.com/userfiles/files/83431390229.pdfIn PDF document text
    • http://parkhigh65.com/clients/4970/File/36469693275.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160c6bd01665c4---38571731810.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/sixitasemalafudidupagos.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/e3e7b15deab7bf7224b9dcff62b28914/71706420660.pdfIn PDF document text
    • https://fertilizergranulatorprice.com/d/files/62372065806.pdfIn PDF document text
    • http://jarosi.hu/files/file/22306847948.pdfIn PDF document text
    • https://spheresignal.com/app/webroot/userfiles/files/lukobagagezuruzasedu.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/regenupokezexawitusejo.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/9sllqgrqalie8ied79v9tcfp34/kolij.pdfIn PDF document text
    • http://gamboeng.com/assets/ckfinder/userfiles/files/66559937677.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/b54361e22f4629fd13e176003cec4f98/jezinupozutebodusamodeba.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/e8a496ddc25722d3f4b1f42dd2fb5324/59970345997.pdfIn PDF document text
    • http://ahhsclassof1980reunion.com/clients/e/eb/eb0bda5e83c72ae03ef0bdd1ae4752ba/File/403436350.pdfIn PDF document text
    • https://wcfkenzi.com/ckfinder/userfiles/files/66969933061.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/91b678bef0c79724660c6142cafdae98/58756856206.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a90502e4859---42323210216.pdfIn PDF document text
    • http://rotang.net/userfiles/file/3003936743.pdfIn PDF document text
    • http://www.weilandensemble.nl/ckfinder/userfiles/files/zivuwope.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/050efdfc456f803a33c472f41ccf2728/sotujezisemoxukesawaluso.pdfIn PDF document text
    • https://vieclamkinhdoanh247.com/upload/files/rolewozikepad.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_off0000da14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA14 22120 bytes
SHA-256: f14865f50d5190621f36e9f30f799ac9c57cf1c984dfa6e73ef4af0f3e5992f3
font_01_sfnt_off00011285.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11285 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A9C 10744 bytes
SHA-256: 658d2e8a60d9a446b12063d8d2098ae47c9295c7db7fc35b2ce88848d1757d89

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