Malicious PDF — malware analysis report

Static analysis result for SHA-256 da23d0eabe4da929…

MALICIOUS

PDF

80.6 KB Created: 2021-09-02 06:44:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 44020f6668d9640704ac45bac3659629 SHA-1: b9665ecf313ca2f05bd9b5c64ecbce302dfc4f5d SHA-256: da23d0eabe4da9299eca664807cc6178f491e457606e3e6a5561c225804a380b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate an attempt to exploit users through deceptive links, likely for phishing or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/97a75918f1af95f8bfdd682183556209/jagakabejuwozirokebup.pdf In PDF document text
    • https://yassinortho.com/userfiles/file/66767353939.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/89577874341.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5e87cb64f---52173107635.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/ac647feb1d076f7609e081d0b3f6013c/devupiwisa.pdfIn PDF document text
    • http://ventss.ru/userfiles/files/5590392992.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/7204e9b41bc31c6c6258556659a0faa1/58934217079.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16078d185e1142---75842452710.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/d35cb738cdaec1e8f42a14864cf7de4e/93127709219.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160aa6cb21c20f---vogopovotufimujata.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16082a72232f96---7643594846.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/803409f5c69dd01942d719151ed7a847/mexidemum.pdfIn PDF document text
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/055273c8ffc6a11aaa769c3505381c49/37282984497.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/73420511538.pdfIn PDF document text
    • http://weberstellen.ch/userfiles/file/kewuvi.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/pipaxibixiwuderepo.pdfIn PDF document text
    • https://camgloberealtor.com/userfiles/file/60647989375.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085d6cd0d297---96367187637.pdfIn PDF document text
    • http://cokhitienvuong.com/uploads/files/60960992947.pdfIn PDF document text
    • https://barcelona-health.com/files/galeria/files/64814064274.pdfIn PDF document text
    • http://chinalabware.ru/d/files/31255743721.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/a5e9016d1af59951fae9f90bee6acbc8/vosuto.pdfIn PDF document text
    • https://sonarmusic.hu/up_image/file/rogozodoxipoxeketadutoto.pdfIn PDF document text
    • http://quincy.pl/ckfinder/userfiles/files/bekazobolegoxinelagogale.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=numerical+patterns+5th+grade+worksheetPDF 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_off0000d4ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ecc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC4 11352 bytes
SHA-256: bcaa6d70eedb576067c75273c950d15aff9fd13e3eacb2c50e81a1c27e87ef39
font_02_sfnt_off00010732.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10732 17424 bytes
SHA-256: 706160dfb94a42cd2ae06e8e8874d57da57c70524a83252b0ef713941f576c6b