Malicious PDF — malware analysis report

Static analysis result for SHA-256 08f543f58fbfb9a9…

MALICIOUS

PDF

91.9 KB Created: 2021-09-06 12:17:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4db50b5d4569446992ee6bc65dd76024 SHA-1: 4e71055561d69a2b407b30f8ddbb0b7b7853ab50 SHA-256: 08f543f58fbfb9a927d4f05e2e439354ab00be48bbe317b57bba9354f8d91eca
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, likely intended to redirect users to malicious content. The presence of external URIs and the link farm structure strongly suggest a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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://tevukasveza.lt/ckfinder/userfiles/files/97659316643.pdf In PDF document text
    • http://atut-biuro.com/uploaded/file/14541047978.pdfIn PDF document text
    • http://caigeshi.com/uploadfile/file/2021073120520973499.pdfIn PDF document text
    • https://varbackaforskola.se/ckfinder/userfiles/files/xupuwanerojaruleva.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7110a2cdab---83922389671.pdfIn PDF document text
    • http://branpc.in/ckfinder/userfiles/files/93075360595.pdfIn PDF document text
    • http://luisacortesearchitetto.it/userfiles/files/34849683659.pdfIn PDF document text
    • http://dxczx.com/ckfinder/userfiles/files/20210818_054002.pdfIn PDF document text
    • http://bibliotekaszamocin.pl/img/upload/files/sovoridegogalugepu.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160720f6264660---12066183155.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d46e36ce575---mimapewifivaduvademi.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/rewilopepizagavi.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/0bfa08f4cfd44053d5f8d8723520d25e/wanavumusef.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/2f7023d560ab4f037aa0097d60160dd2/dolizubelufafuxibetodu.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077e82a3debf---55762616523.pdfIn PDF document text
    • https://mertlakustika.cz/images/pages/file/gimugoxulonuj.pdfIn PDF document text
    • http://aexpress.lv/index/images/up/file/41272013770.pdfIn PDF document text
    • http://designpavelzapletal.cz/files/file/66327938552.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/g7o7l4fku4hrma1mvkv28pmd01/32784495325.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd0f6446c4---nunolumajugogoxedoni.pdfIn PDF document text
    • http://massvt.sk/editor_uploads/system/files/45688541731.pdfIn PDF document text
    • http://perseverance.cyou/updatefiles/file/24789652613.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=clara+schumann+die+lorelei+pdfPDF link annotation
    • http://pro.ovh.net/~tribuene/images/banque/file/zesup.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e231.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE231 22540 bytes
SHA-256: 687a42b50d47a567bef9676de1096656ca7a5694bae778065828b085f48c07fe
font_01_sfnt_off00011afa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AFA 10920 bytes
SHA-256: c78b03e8150549048ec101e526c19ed6218f237e6ed4def1d226c0f651a97fb9
font_02_sfnt_off00013408.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13408 16164 bytes
SHA-256: 6b3405851770206eab296e5a5899eb5bb2b19fe0a152c418b5ca8f0c6ab4e001
font_03_sfnt_off000149b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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