Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b3a93f28ca3abc2…

MALICIOUS

PDF

81.2 KB Created: 2021-09-06 15:13:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3d8d7ba2547cef6d44ee38a4e4e3e9ba SHA-1: cac774b381116f08d9078fe8fc7da770130d0383 SHA-256: 5b3a93f28ca3abc2488a62495ceb169cd64b6317796915c31473f86bf419195d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. The heuristic firings indicate this PDF is a link farm, likely intended to lure users to malicious websites for phishing or malware downloads. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://pistant.ru/uplcv?utm_term=kaba+kamene+pdf PDF link annotation
    • http://xn--80aadq3ae7aa5k.xn--p1ai/upload/file/80963912798.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f81c0113405---suwilokawuronuxelupepez.pdfIn PDF document text
    • https://lazerom.pro/media/file/tejasolibat.pdfIn PDF document text
    • https://u15.ch/ckfinder/userfiles/files/15803228317.pdfIn PDF document text
    • http://exima.kr/userData/board/file/73397289488.pdfIn PDF document text
    • https://bcm.es/files/galeria/files/82038129938.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160726ee7c0c48---76710665380.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16090aaebbd67a---xagozet.pdfIn PDF document text
    • http://www.vikingmaterials.com/img/lafategedufoporoxibok.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/samaxekefavixu.pdfIn PDF document text
    • http://22743333.com/userfiles/files/saxosimalunuziduninoxez.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f03bf49c086---64994195751.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607e47a04e14d---kudukobidedibaforuwoliz.pdfIn PDF document text
    • http://custom-mugs-factory.com/uploadfile/files/58079090734.pdfIn PDF document text
    • http://studiofantino.it/userfiles/files/xofemosajumifo.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608541b64a9c1---87087778220.pdfIn PDF document text
    • https://tectrongim.com/uploads/files/nabatiletavowokamakumi.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/oqcd7a25dkq1g4mnofa6r77bpf/gunugojavijukevuxomow.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/jezotokawiri.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/a233f43aa2855da299ea0375e8ad7edd/fofegudavobeledamas.pdfIn PDF document text
    • http://dnepropress.net/files/file/webokokajovupikomifoki.pdfIn PDF document text
    • http://assotechne.eu/userfiles/files/vokozoxaditu.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/05c0081285ea8f9838da54d8945e15f7/bozorubotorojoba.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_off0000d8fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8FE 10260 bytes
SHA-256: d5cee31336df82fa3da88bbb89d5bd03abb43494436a461069b4d36ee47a821b
font_01_sfnt_off0000efc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC7 18332 bytes
SHA-256: 62e60607fc55110382ab0278e53d78903b140f6fe1a2e6b1b138f01a01c46285
font_02_sfnt_off00011f95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1