Malicious PDF — malware analysis report

Static analysis result for SHA-256 53b70bcd9c0ee3cb…

MALICIOUS

PDF

68.7 KB Created: 2021-09-01 11:52:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f335b6741e31127c9628da667198954a SHA-1: 8c12bbb149c4ccdbfbb52f50a2b8479e462a20b4 SHA-256: 53b70bcd9c0ee3cb72025f720571e589587b6844ed5bd1e24a13b4b9435132d3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the detection signatures strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/9bq2904d4je9v30ifvdsqoff83/78446509452.pdf In PDF document text
    • http://ed-web.cz/userfilesfile/42212312446.pdfIn PDF document text
    • https://elegune.net/files/galeria/files/4554550226.pdfIn PDF document text
    • http://zeguvietnam.com/uploads/ckfinder/files/dajifelomet.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/rumado.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/87661780069.pdfIn PDF document text
    • http://moyamoya.center/images/hand_uploaded/files/24544977311.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b07f506fdff---2967082743.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611a0d3f6573b---wuwazupivefizalebokoj.pdfIn PDF document text
    • http://cicm2015.mist.ac.bd/app/webroot/ckfinder/userfiles/files/6024749523.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/16078d87d57f80---nowevifufuferisij.pdfIn PDF document text
    • http://architettorobertafasola.eu/userfiles/files/fuxusapatugaj.pdfIn PDF document text
    • http://rapet.hu/files/82878609728.pdfIn PDF document text
    • http://www.onlinetemsilci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160750b5634681---87672882964.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/f7135e620346ff8fea6d05b064fed4b7/34559548001.pdfIn PDF document text
    • http://montpellier-business-plan.fr/mbp/upload/images/images/upload/ckfinder/11339714949.pdfIn PDF document text
    • http://boilerservis.ru/uploads/files/82943239604.pdfIn PDF document text
    • http://boissee.fr/userfiles/file/ximisavav.pdfIn PDF document text
    • http://acevina.com/webroot/img/files/96495735084.pdfIn PDF document text
    • https://bursakaynak.com/userfiles/file/51537204939.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/684bed54f25fb02f5eda2300b9cac261/segazelarezol.pdfIn PDF document text
    • http://alburigiott.it/userfiles/files/91583827254.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/229286df7d73f47902637dfc30af6408/lusatomojadudiba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=adjective+for+musicPDF 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_off0000b114.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB114 10604 bytes
SHA-256: 3a566fd52835313bf8b5aea19a85e2c7abb78298acb1f434299603b95bc90bce
font_01_sfnt_off0000c95a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC95A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e16c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE16C 14580 bytes
SHA-256: bbb1964a0f6c79907d48c1bad1eeb51a418e7f012a6aa28e6d009e972d3d7726