Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9059e456dde8cbf…

MALICIOUS

PDF

92.2 KB Created: 2021-09-19 04:51:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0d3c87cb1a57e5c6bc8bc494381514cf SHA-1: 07a99917fbdeebd80800f6f785b10453bcd466df SHA-256: c9059e456dde8cbf411ee87fd1f7ad0ac7de28b78635cebb786afbc999964e20
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicative of a link farm. The presence of embedded JavaScript and a ClamAV detection for 'Pdf.Phishing.Trojan' strongly suggests malicious intent, likely to redirect users to phishing sites or download further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms the nature of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://huntic.ru/uplcv?utm_term=adblock+focus+apk PDF link annotation
    • http://euskararenginkana.eus/files/galeria/files/74007453841.pdfIn PDF document text
    • http://sartoriaventurini.com/userfiles/files/44156466751.pdfIn PDF document text
    • http://tunapvietnam.thietbiotoviet.com/Images_upload/files/6573442572.pdfIn PDF document text
    • https://osakaav.com/userfiles/files/wodupigajodofonoxutofi.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/24868846418.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614392b07597c---jovezemejisupusatemupoka.pdfIn PDF document text
    • http://studiochiodo.eu/userfiles/files/ziwevebajopibodul.pdfIn PDF document text
    • https://macintosh-szerviz-javitas.nuttydog.hu/ckfinder/userfiles/files/suwuvevijojuf.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/luwepubirekefatulawabexi.pdfIn PDF document text
    • https://singhaniabrothersltd.com/ckeditor/ckfinder/userfiles/files/kuxefam.pdfIn PDF document text
    • http://idealthailand.com/file_media/file_image/file/worezukeziwa.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/09ffa506aa5db841702288c5fe63e0c2/xemisizuxefoxutate.pdfIn PDF document text
    • http://heathrowairporttaxi.website/userfiles/file/16329863795.pdfIn PDF document text
    • http://kbcsisa.com/upload/fckeditor/file/47278859700.pdfIn PDF document text
    • http://hiroshima-teishaku.com/userfiles/file/maboju.pdfIn PDF document text
    • http://huseyindurmuslar.com/images_upload/files/worokep.pdfIn PDF document text
    • http://www.dawnrotaryclub.tw/UserFiles/files/17810826139.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/38047403685.pdfIn PDF document text
    • https://dazhonghua1688.com/ckfinder/userfiles/files/texifipesotasajanebiz.pdfIn PDF document text
    • https://dynasty888.com/image/files/20210906_020545.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/fadoxaferosofisud.pdfIn PDF document text
    • http://maezawa-jidousha.com/js/upload/files/soteniwijonulupixebik.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16132aba07ac9f---zuxavadewifeduvosi.pdfIn PDF document text
    • http://origo.ws/userfiles/file/kaxib.pdfIn PDF document text
    • http://mydreamtuscanwedding.com/editor_up/58929863202.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_off000100ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100CE 10400 bytes
SHA-256: 46f4e8208522e351c6c25e944ae1a8ef475d5e1fccefb04168c567aedb811cb5
font_01_sfnt_off00011845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11845 19292 bytes
SHA-256: 9fd8f32b51edbadd547c72c824d77dcf9bbd271faf581427fa853eaef2564ead
font_02_sfnt_off00014afe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1