Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5e422be791d124e…

MALICIOUS

PDF

72.9 KB Created: 2021-10-02 21:26:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 10990ee11224ab0291bf5c8c79a31540 SHA-1: 659e47b2631acf27ea682cdd31b69f23ccc3dbfe SHA-256: c5e422be791d124ea33e15634c0c3e4c6ad1d64e8f439803e38429cf2f60a17c
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised CMS upload storage and disposable hosting domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://debo-fit.be/userfiles/file///wojojedekaxax.pdf In PDF document text
    • http://garderoba.sk/images/_file/37257808932.pdfIn PDF document text
    • http://someteme.com/archivos/_20210928063541.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613d642748391---72684926271.pdfIn PDF document text
    • http://galettedesrois.hu/userfiles/file/vutokalusidafewobuvovep.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16150ba51bbbd7---85855003702.pdfIn PDF document text
    • http://yushendesign.com/images_fck/file/1633171651.pdfIn PDF document text
    • http://pinxedien.net/upload/files/92975219545.pdfIn PDF document text
    • http://gpp300.fr/userfiles/file/babidixujemositi.pdfIn PDF document text
    • https://ist-lb1.istanajp.com/contents/files/1832936433.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161346729edc29---xabunusigijiruwepopep.pdfIn PDF document text
    • https://pushtypathshala.com/demo/aims/files/images/files/gobujesaburapojur.pdfIn PDF document text
    • http://diegogenna.it/userfiles/files/46836998119.pdfIn PDF document text
    • https://mttrasportisrl.it/dati/upload/file/97285892102.pdfIn PDF document text
    • https://alicantea.centralcms.cloud/galeria/files/panisebawodimerari.pdfIn PDF document text
    • http://www.saveurspoitoucharentes.com/admin/ckfinder/userfiles/files/67436461026.pdfIn PDF document text
    • http://camelliafb.com/uploads/files/202109121305032474.pdfIn PDF document text
    • http://shoreluxurylimos.com/userfiles/files/40214160455.pdfIn PDF document text
    • https://mangalargalux.com.br/ckfinder/userfiles/files/lufekokiloxepipu.pdfIn PDF document text
    • http://abwva.com/uploads/files/jidavazijuk.pdfIn PDF document text
    • http://balbu.eu/uploads/news/file/54183485059.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/9e3635693bfa51493184d8c78bc5ea64/49761044801.pdfIn PDF document text
    • https://terminarz.online/kosmetyczka/krakow/files/18244513101.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/16156f7cbd3e91---xelukazoxatotabek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=the+sun+and+the+moon+storyPDF 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_off0000b6b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cecd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCECD 10552 bytes
SHA-256: 6c2b7d3a9197b4e429c1b111abc76726b607c286ad9465b62312784fc020b8d4
font_02_sfnt_off0000e6b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B1 18764 bytes
SHA-256: 99cea50a64742456d22993b9ba9b2776c2c485f9caadfde8ca8ca405ba27c3fc

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