Malicious PDF — malware analysis report

Static analysis result for SHA-256 b737c663ab8b65c7…

MALICIOUS

PDF

84.1 KB Created: 2021-09-03 02:35:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: c27631deb6a7d371c0c0eddadc822f2d SHA-1: af5f8e747ee8056f5d6044233d9063c65636de13 SHA-256: b737c663ab8b65c79feb846872b74d26ee26fe61529eae7e430f01c866c0d602
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d1eae4bf8a2---19012077524.pdf In PDF document text
    • http://conblocmanado.com/pics/file/giwagiwumozukexerunumud.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/shtnin1gamm3pq7dj2q4rrahrq/33917372931.pdfIn PDF document text
    • http://pagyesa.org/userfiles/file/20210626032913.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/dowajumobex.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/uvrf14jvudkpnmn6tc0ssdbevl/21468264574.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086142c5beb4---kupolinevuzunimipu.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed357337bd---dazopivejade.pdfIn PDF document text
    • http://africareview.in/userfiles/file/logufewuwaxefopog.pdfIn PDF document text
    • http://qiuyutv.com/userfiles/files/20210727053756.pdfIn PDF document text
    • https://innovaciones-plasticas.com/imagenes_cont/sitio/documentos/jewamopunezibuxijatifonip.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/75a2eabc14c888bca338007f67f5df2d/lonevuradesi.pdfIn PDF document text
    • https://aonetreks.com/uploads/file/98678341825.pdfIn PDF document text
    • https://sklep-pinokio.pl/web/uploads/files/ganetupisojumazenofasazid.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a89d176ce86---vadeg.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084869bc9857---29478495907.pdfIn PDF document text
    • http://phukhoabacninh.com/images/files/jovexalinomuwajigexup.pdfIn PDF document text
    • http://maternites-catholiques.org/ressource/site-image/files/84021827634.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/sirakenosibolugezeluneba.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/44643187413.pdfIn PDF document text
    • http://takeacode.eu/user/d41d8cd98f00b204e9800998ecf8427e/file/67150675379.pdfIn PDF document text
    • http://goldenbaycruisesagent.com/userfiles/file/koteb.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/161177d8e4eca4---wuvumovan.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/ee3bbcb470ba853fb78624743628fde4/12858842399.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=netgear+n600+router+manual+pdfPDF link annotation
    • 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_off0000e3c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C1 10948 bytes
SHA-256: 1474b82ba32b8c1ae673ef615c46ddcc768a7cdbedce2d77fc7e5950708137d3
font_01_sfnt_off0000fcee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCEE 17648 bytes
SHA-256: e4cb4f43c078576118f621bcd50aa4cee2a8d9c894a07540dded9e9ecf544114
font_02_sfnt_off00012a62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1