Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce273025fc5e8c6a…

MALICIOUS

PDF

87.1 KB Created: 2021-09-08 04:49:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e8e246df9fc74719948b365d228d7d58 SHA-1: a0614bac6af7b68db51893b3f7a5261bf75b35f6 SHA-256: ce273025fc5e8c6acccfbff8a46c64b822d803273d4a8f1fe29e874d8799d1c5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. The PDF also contains numerous external URIs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crewmak.ru/uplcv?utm_term=watsons+go+to+birmingham+quiz+pdf PDF link annotation
    • https://baust.edu.bd/app/webroot/ckfinder/userfiles/files/kimigovezepegipanavilan.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/05fpj6n0bf196mnkkcg22jbc90/nagikesidelejuvapujidisid.pdfIn PDF document text
    • https://saint-florentin.charcutier-traiteur.fr/ckfinder/userfiles/files/49459603304.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609c2df237110---nidazigowito.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091cf883d6fb---mugit.pdfIn PDF document text
    • http://terfigyelokamera.info/files/file/fuzedidobamovaniki.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/d9f14c9b65738c73d2b4924bc0a0f489/vodomoru.pdfIn PDF document text
    • https://fainitelecommunication.com/public/editorfiles/file/gokizepaluvepib.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/3gieq9rd5238m1h6drgv5uc4s6/51920479281.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b4247ebfd06---lijas.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/16097c2641f6b3---ririwavifazogexobulunefe.pdfIn PDF document text
    • http://sns.hu/_user/file/zexifukurumunodedatotad.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b4973c41ca9---gosimimujokavinedexavuled.pdfIn PDF document text
    • https://cuatudongnhatrang.com/uploads/files/2075501243.pdfIn PDF document text
    • http://kingsauto-bar.com/js/upload/files/vebarerozenituno.pdfIn PDF document text
    • https://prestinieurope.ch/userfiles/files/vofonifavekazapa.pdfIn PDF document text
    • https://pharmnet.cz/ckfiles/files/files/39216345950.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081d83c54548---86823470584.pdfIn PDF document text
    • http://i-dron.cz/data/file/48402642598.pdfIn PDF document text
    • https://moto-trend.cz/public/files/fck/file/mojozesowudojepokipono.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/7200451778b7e1ed908146bb9e4a75c0/20533379175.pdfIn PDF document text
    • http://dblbtech.com/userfiles/file/26002174606.pdfIn PDF document text
    • https://asiahealthcaredentalcentre.com/ckfinder/userfiles/files/48495131183.pdfIn PDF document text
    • http://wf515345.tw/CKEdit/upload/files/bunilipewis.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/43861862790.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_off0000ebb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB1 19040 bytes
SHA-256: defde1b7b5ff25fbd952e8598aa949562f3343d3725facf310c8da7219fd51a8
font_01_sfnt_off00011d68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D68 11208 bytes
SHA-256: 07897c4c2c447e3475c764434b6a57d8b18b4ec64948c7dd504e7f8acf5f4b34
font_02_sfnt_off000136cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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