Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3d894ac562b3bba…

MALICIOUS

PDF

69.3 KB Created: 2021-09-25 14:10:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 11dc2381ad502c4e39b79c6db1e40d74 SHA-1: 688dee2f3aec4ede91b91530c47e4e7641f86161 SHA-256: c3d894ac562b3bba33714e4d136907f9bb925bdea70ee6226062adced8ec1906
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous heuristics point to the file being a link farm designed to redirect users to compromised websites, many of which are hosted on WordPress installations. The embedded URLs suggest an attempt to distribute further malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://nomylo.ru/uplcv?utm_term=sentence+starting+with+i+is PDF link annotation
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/ed3uhmpgsqkcj6da3v6nocco52/50330149478.pdfIn PDF document text
    • https://ljlconst.com/admin/images/file/68987873291.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/78636903932.pdfIn PDF document text
    • https://nusantarabet4d1.com/contents/files/nisawarawufivulogovifebu.pdfIn PDF document text
    • http://designbeginnings.com/upload/file/vavigapeta.pdfIn PDF document text
    • http://thessalonikiflights.com/files/files/4540303181.pdfIn PDF document text
    • http://noithatsah.com/webroot/img/files/14805065346.pdfIn PDF document text
    • https://latarnik-kopice.pl/galeria/file/24796868677.pdfIn PDF document text
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/74557147837.pdfIn PDF document text
    • http://cee1968.com/ckfinder/userfiles/files/68030616786.pdfIn PDF document text
    • https://lbjgold.in/ckfinder/userfiles/files/35838283108.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/files/files/99369371755.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/a348e10402f4ecaed91cdee64ea0df05/dokujitaruxawibazavuze.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/5db9dfec77e4bc701ed64f99c9f4878e/wobef.pdfIn PDF document text
    • https://lazdynumokykla.lt/userfiles/file/55926495335.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161324895d63ae---xometoxiwutowupujena.pdfIn PDF document text
    • https://we-plus.tw/ckfinder/userfiles/files/mozufufamukabiwudob.pdfIn PDF document text
    • https://angkagenap.com/contents/files/vuxerudegotawunisibux.pdfIn PDF document text
    • https://hotelharmika.com/assets/userfiles/files/fulekowomujuvuzakenu.pdfIn PDF document text
    • https://jewfri.kr/files/image/files/48488496180.pdfIn PDF document text
    • http://crocepadrekolbe.it/userfiles/files/tevagegaju.pdfIn PDF document text
    • http://ydyb.com/filespath/files/20210907025809.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_off0000b0fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0FD 15192 bytes
SHA-256: d4828f7d8d0e4fbc994554d8eda1746ddce5565571ecb434c33e21ea75e4c89a
font_01_sfnt_off0000d779.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD779 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF90 10504 bytes
SHA-256: b293c7913a86900d98deda6e1f213a73565088f3515f08ef8a3ad38cb58f08d4