Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed877990ab02a6a6…

MALICIOUS

PDF

84.5 KB Created: 2021-09-21 07:57:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f473639558e0d4c4d02713ce1f7fd474 SHA-1: 8e2f8db72002f28ecfe9044c45ea38611dc58554 SHA-256: ed877990ab02a6a6945b5348ab8de51df24f613a75a037723496f234ae6d319e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting an attempt to distribute malicious content or phish for information. The presence of external URI heuristics and link farm indicators further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://drafthe.ru/uplcv?utm_term=screen+mirroring+in+mi+android+tv PDF link annotation
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/161422d21140d7---17083904090.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/58846328982.pdfIn PDF document text
    • http://malir-naterac.info/UserFiles/File/movujajez.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021090800022782.pdfIn PDF document text
    • http://taxfreepoint.com/file/27587162119.pdfIn PDF document text
    • https://aitalk.vn/upload/files/86364829466.pdfIn PDF document text
    • http://makesrealsense.com/ckfinder/userfiles/files/7445000065.pdfIn PDF document text
    • http://scpt.it/userfiles/files/97898153827.pdfIn PDF document text
    • http://bezpiecznamlodosc.org/files/file/gadixofozuwedokika.pdfIn PDF document text
    • https://pavillonwohlen.ch/userfiles/files/1974463997.pdfIn PDF document text
    • https://hilanguage-com-tw.triangle-design.com/files/bubomap.pdfIn PDF document text
    • https://kenhquangcao.vn/uploads/files/50305419487.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/af1bb0b1dc85a7c71f938200ecb4f275/fexaso.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138e95cb4e2f---bomesisezojizizaxi.pdfIn PDF document text
    • http://levne-pohary.cz/UserFiles/File/30056608637.pdfIn PDF document text
    • https://98ing.com/upload/ck/files/20210911_220315.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/xuxor.pdfIn PDF document text
    • http://royalleasingny.com/admin/images/file/nuvevagetojugokad.pdfIn PDF document text
    • http://sigmabhp.pl/userfiles/file/wuxefelekojexebebibevuxe.pdfIn PDF document text
    • https://tvsporedi.si/vsebina/87626386550.pdfIn PDF document text
    • https://blokhol.com/upload/files/tuwafatomidubefabe.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614099c7178e0---sewudurijarolelibudimon.pdfIn PDF document text
    • http://robertoantoniz.com/resources/original/file/golamazinubute.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_off0000e5d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D1 10640 bytes
SHA-256: c65869dce3e76191f6f8d6465a9865d6dd0ac1d5b8fe1127c35dc78c09031322
font_01_sfnt_off0000fdf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF7 17936 bytes
SHA-256: 00d8ee9703ad4b6cfe7bdde17b4e7e59500025446a507c0cdf13b40a206928a3
font_02_sfnt_off00012c31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1