Malicious PDF — malware analysis report

Static analysis result for SHA-256 a012f10b0d3057b2…

MALICIOUS

PDF

77.8 KB Created: 2021-09-09 07:54:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 467203117ce608e4502b725b7cffbba0 SHA-1: 5dc940f4444546f4aae5b4e2e9f4b5ebc88ff70c SHA-256: a012f10b0d3057b2252a005a542bf2d65b1c2ae1a7f0b7db749ac4a4d12dddfd
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and disposable domains, indicative of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with exploitation techniques.

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://synerhu.ru/uplcv?utm_term=windows+video+player+for+android PDF link annotation
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/3n3b3m9ikt0eptpgbttnkvf6eh/guwufoleze.pdfIn PDF document text
    • https://themis-lex.com/userfiles/files/ruwofezolifukexa.pdfIn PDF document text
    • http://one9five.com/userfiles/files/zojufowomexazotawilop.pdfIn PDF document text
    • https://ever.dacola.com/upload/files/mijasijitikiros.pdfIn PDF document text
    • http://simsvizag.com/contentimages/file/nipusajedusikixejonupan.pdfIn PDF document text
    • https://www.vita-organic.eu/admin/ckfinder/userfiles/files/metiju.pdfIn PDF document text
    • http://saluteebenesseresas.it/userfiles/files/jurabodamedekogawejojo.pdfIn PDF document text
    • http://pokrowce-ochronne.pl/Upload/file/buxikesetafatujebew.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/jvfv16tcv0jsfl3jbs61l79jq1/64295428872.pdfIn PDF document text
    • http://aldobini.it/userfiles/files/47014774915.pdfIn PDF document text
    • http://gearonlaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/norupubamodeg.pdfIn PDF document text
    • https://uslugiinzynierskie.com/eurostyl/photos/file/27071253876.pdfIn PDF document text
    • https://sanaspinler.com/calisma2/files/uploads/32709513134.pdfIn PDF document text
    • http://wtmongolia.com/materials/file/tumowapokulipojivek.pdfIn PDF document text
    • https://theshamrockpublecco.it/file/73370823424.pdfIn PDF document text
    • https://pastravariaizvoarelebratiei.ro/images/file/lezuju.pdfIn PDF document text
    • https://maria-galland.ru/files/file/pinemerejetepitev.pdfIn PDF document text
    • http://gardensyellowcab.com/admin/images/file/97524868695.pdfIn PDF document text
    • http://zenkatsu.dk/files/50870888403.pdfIn PDF document text
    • http://artc-polymers.com/upload/images/files/xujukafufewolipatozovogu.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132c91f90e08---67167067885.pdfIn PDF document text
    • http://sochi-riba.ru/ckfinder/userfiles/files/68059637430.pdfIn PDF document text
    • http://vektor-bezpeki.com/userfiles/files/58567331452.pdfIn PDF document text
    • http://viethanit.vn/hinhanh/file/dedukakuvabamorosaje.pdfIn PDF document text
    • https://gullyracing.it/admin/ckfinder/userfiles/files/75357864819.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_off0000cc8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC8C 17032 bytes
SHA-256: b2fcef86bfb295320a7e993af1faa5dfba7ff9dce39d0728a490f549d32db669
font_01_sfnt_off0000f8ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110C4 10652 bytes
SHA-256: 5516bfd250eb9648a3478ff851a672f3fb434d6a084b117fc0cdb1d57e6ffaea

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