Malicious PDF — malware analysis report

Static analysis result for SHA-256 891c03c21732a109…

MALICIOUS

PDF

91.6 KB Created: 2021-06-26 10:49:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c838f72d88be2e315da0c047dcc371c1 SHA-1: 90f44ec0538d0f3c099a74be25bf6d5ed3ea99bc SHA-256: 891c03c21732a109d3ef8ff043e6cc5ae4c16d662bfb20fb45fab52c7892b797
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It functions as a link farm, containing numerous URLs pointing to compromised websites, likely to facilitate phishing attacks or distribute further malware. The presence of embedded URLs and the nature of the link farm suggest an intent to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://coretry.ru/uplcv?utm_term=can+a+judge+be+sued
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b5ec0cb47d9---36661956698.pdf
    • http://camionespanamericana.com/userfiles/file/25313706938.pdf
    • https://anmimar.com/royal/userfiles/file/23294499656.pdf
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/vkleado9dopi6bpbqd4kim87ud/91743918385.pdf
    • http://vasvaripalmuzeum.hu/upload/file/boxedawutaligaxak.pdf
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160917c6c8a33e---patoxak.pdf
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1608888086fd98---20369487194.pdf
    • https://wickedcheesy.com/images/file/88537986287.pdf
    • http://dabaizhongxue.com/upload_fck/file/2021-6-3/20210603212915678753.pdf
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/dd50fea92ba20ead666ba8bc317f8ac9/89383986462.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b23c6f36145---57037387026.pdf
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a192427514b---fetuzupodebaje.pdf
    • http://ecandrychow.pl/Image/files/xixelalupetojirunexeb.pdf
    • http://bestapp4u.com/admin/uploadedfiles/file/4182812211.pdf
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/a6e9ba2d7865eb5c1db3658fafe5690f/gudafuzijijubamasomi.pdf
    • http://interel-rus.ru/test/sites/default/files/file/foxalo.pdf
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160727a51105c1---buzalamabunabifirujorekal.pdf
    • https://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/a0541fb47446f4dc68b3820e01bea832/betusawofa.pdf
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb91feca26d---21013073.pdf
    • https://aedwea.com/upload/foto/nadita.pdf
    • http://absolutelyneon.com/userfiles/file/lofisuvof.pdf
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/0726077f77f3880bd0f53ccbe1c532b7/dubofefomotuz.pdf
    • http://absolutelyneon.com/userfiles/file/garirajarup.pdf
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/5b790b96393164b5186e0ceef60bff4f/31051613866.pdf
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f185d6cc2---43077017151.pdf
    • https://binarbaidequipment.com/public_html/userfiles/file/51532822174.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_off0001034d.bin
bac2270b635db10f16546ac29f6d163f0414f0d74b633f01214f4e552328c990
pdf-font-stream PDF embedded font (sfnt) at offset 0x1034D 10368 bytes
font_01_sfnt_off00011aa3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11AA3 16792 bytes
font_02_sfnt_off000132b5.bin
02bcaafc6b02e061d4d19bf412ac1d2b56d3608ea9a07a7d88a742097db6e279
pdf-font-stream PDF embedded font (sfnt) at offset 0x132B5 17692 bytes