Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cb12b730a3021ab…

MALICIOUS

PDF

81.9 KB Created: 2021-09-09 13:02:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ce2b417a8bb651190c7fa3855666045b SHA-1: 673647b9c9763b768823212512bbb9fc163d1545 SHA-256: 2cb12b730a3021abafb8fb99ffad4c80ab0235bd18d67188ef6a05c5bdfbf978
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded URLs and link farms pointing to potentially malicious domains, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://ketchas.ru/uplcv?utm_term=suzuki+cello+book+3+pdf
    • http://hsi-international.com/ckfinder/userfiles/files/62045367802.pdf
    • http://doktor-okonski.pl/uploadimg/file/39186255183.pdf
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/161393e748809b---4248593644.pdf
    • http://xn--90afqerdlt1f.xn--p1ai/admin/ckfinder/userfiles/files/vuduto.pdf
    • https://ski-valloire.com/ckfinder/userfiles/files/ziwafosi.pdf
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134a2f0e26f8---gubuzidewe.pdf
    • http://muntepa.com/userfiles/files/xugazepimizozojaparebap.pdf
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/3d9db924bfb3e4ac05bfd6e07f8c2792/putidudazaro.pdf
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613600b135f98---doxedapaluxonisejul.pdf
    • https://osakaav.com/userfiles/files/tapemodotemupaxezumus.pdf
    • https://kanalprofi.at/UserFiles/file/zirus.pdf
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/788bc9cc7d99ff8a87d3ba57c2fc127e/gadepom.pdf
    • http://freewest.at/punoropogoxe.pdf
    • http://nebovsem.ru/app/webroot/files/files/35070950387.pdf
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/161361c42514db---40346385820.pdf
    • http://dobrejaja.com/Upload/file/tarizukuvozufubesitat.pdf
    • http://timebymtm.com/upload/files/15398996777.pdf
    • http://studiodugnani.it/userfiles/files/51074443087.pdf
    • https://tpk-m.ru/files/file/7260658746.pdf
    • http://latiendasegura.com/contable_prueba/userfiles/file/52959628108.pdf
    • http://worldofpacifiers.com/editor_uploads/system/files/dapulatuxo.pdf
    • https://ustunbilgisayar.com/userfiles/files/soravuroxumadiw.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d236.bin
cdd06ddc5d01fd4bed4553935457f588ba94deeca67914b9adcf43d952169a68		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD236 20812 bytes
font_01_sfnt_off000109a6.bin
4a7ff4d0ece57485f6704664bc9539a2513edf36dc1f11c4ec52fe847ece02a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109A6 10620 bytes
font_02_sfnt_off000121e7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x121E7 16792 bytes

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