Malicious PDF — malware analysis report

Static analysis result for SHA-256 459a3813fcd05863…

MALICIOUS

PDF

93.7 KB Created: 2021-09-14 04:54:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7cc3afbd971bddeebdaec777e9bc29a4 SHA-1: 801feaeb953000ea10a581e93902b92d63fa76e9 SHA-256: 459a3813fcd05863d1cfa51fa340762cd4e9e9f48473f7f87271bd5414cd36d0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm on compromised WordPress sites. It contains numerous embedded URLs pointing to potentially malicious content, suggesting an attempt to redirect users to phishing or malware-hosting sites. The presence of external URI heuristics and compromised CMS upload links further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://smidgel.ru/uplcv?utm_term=alex+rider+snakehead+read+online PDF link annotation
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/95e0005fe07720feda13a1dc2333f779/vimokejegenosojafuwesi.pdfIn PDF document text
    • http://karthikeyanjayaram.in/userfiles/file/zezoseweb.pdfIn PDF document text
    • https://miaousland.fr/ckfinder/userfiles/files/puwat.pdfIn PDF document text
    • http://mywayrtk.org/userfiles/file/10708071740.pdfIn PDF document text
    • http://sbstroy53.ru/img/files/8835190092.pdfIn PDF document text
    • https://bdblue.com/ckfinder/userfiles/files/lazivusazol.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161313aebeff9c---10717263503.pdfIn PDF document text
    • https://larrialdiak.es/files/galeria/files/9407273441.pdfIn PDF document text
    • http://sjhtractor.com/d/files/bofuzinolip.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/a8793b7d516ef4129b193101ede706f4/magevulodegupotow.pdfIn PDF document text
    • http://gaudi.tw/upload/files/79564309056.pdfIn PDF document text
    • https://dreamscapes.ca/dream_scapes/userfiles/files/46211504874.pdfIn PDF document text
    • https://willes-gb.com/uploads/files/202109030148269266.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/ee14026cc53394a93d953a64e2a67903/52466959691.pdfIn PDF document text
    • http://www.eau-msu.ru/ckfinder/userfiles/files/gewijolakafabalizewoza.pdfIn PDF document text
    • https://derechosenred.org/aym_image/files/78273033691.pdfIn PDF document text
    • http://furnitura-syndicat.ru/ckeditor/ckfinder/core/connector/php/uploads/files/82577201112.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca8d5b4e70---18708575901.pdfIn PDF document text
    • https://gruntbudowa.pl/files/file/guduwejaxavexizevolipafoj.pdfIn PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/xujapomodifevatobisi.pdfIn PDF document text
    • http://xn--krmer-dnnebacke-1kb72b.de/files/file/naxovotosufekidabokuwedow.pdfIn PDF document text
    • https://red-adlay.com/upload/files/zurud.pdfIn PDF document text
    • https://nutrishop.in/ci/userfiles/files/70680176016.pdfIn PDF document text
    • https://b2cdemo.tickets.com/content/files/97478401436.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_off0001098f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1098F 10420 bytes
SHA-256: 89ae622d69bd7d710e93033a01dc7f48f6e4cbd24c5bf7a11c0ba914186688c1
font_01_sfnt_off00012118.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12118 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001392a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1392A 18456 bytes
SHA-256: 0a6765422a1877b9bc04ce8f878174b8c639892a76cbd72dc190ee3e5fe65a8a

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