Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf24411a4078a809…

MALICIOUS

PDF

72.2 KB Created: 2021-09-01 07:08:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 396ab5cdbb2cb5209a2291773f1fbba3 SHA-1: f30b63854b5be49618d2472395e5a8f79a978ae3 SHA-256: cf24411a4078a809c477ccfa02b7c22c57fc50bdce6b49a89e6f294f358519e2
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as Pdf.Phishing.Trojan. The file contains numerous links pointing to compromised or disposable domains, suggesting a phishing or link farm attack pattern. The primary goal appears to be directing users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://drafthe.ru/uplcv?utm_term=normal+body+temperature+chart PDF link annotation
    • http://imcborivali.org/userfiles/file/43221740482.pdfIn PDF document text
    • https://conexus-study-abroad-travel.com/ckfinder/userfiles/file/litosikinanedugavak.pdfIn PDF document text
    • http://pensjonatagat.pl/userfiles/file/49304537123.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/febigokem.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/4729ff62c311bca8d0313447fac7f02c/1645212318.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f5661f1276---vokatudavimuporoka.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/92afl2r96pnd4j46nv96ev1fnd/2274191440.pdfIn PDF document text
    • http://rhodeislandalpha.com/clients/56223/File/18392539280.pdfIn PDF document text
    • https://ikitellirezistans.com/upload/files/dewasani.pdfIn PDF document text
    • http://www.ettermanenterprises.com/ckfinder/userfiles/files/96239604444.pdfIn PDF document text
    • http://utopiasacramento.org/clients/0/07/071cdeedc048305be324eb10ab8031d4/File/85575523235.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/160804a1a8ec53---25297569976.pdfIn PDF document text
    • http://vitaminyplus.eu/files/file/botudisa.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16083c8ca1e929---35369026827.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160add03934f08---96697204819.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608b390637649---20091418308.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160876d5cdaa82---3021653269.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf626705f6---52885032216.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/5aae71bc7002587c1000413478e7db8b/7606905374.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/0774bfad2bb56e6aa054990140129f32/buwutumomuwodamal.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/24609811533.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/c8ec09a0af62e23184a937670b5efe2b/gijedilamifewedov.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/bazajapusepuler.pdfIn PDF document text
    • http://thaoduocquyhiem.com/userfiles/image/file/27752790664.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/dsqsb0lom5bc6akd72kedqv98d/xejojuwafaxisu.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a703eca50ae---bawanumomixumopil.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/4ce898173656fcd3c5f32f05a71126ba/mozirogewetuzepuse.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_off0000bc53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC53 10744 bytes
SHA-256: b3aa6ace7abbe29f802201b70b887b794aa5a6d988ecce1d3a552e4f1ff837e5
font_01_sfnt_off0000d4de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ecf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF0 15184 bytes
SHA-256: 390a3f403b8d671c25c3879f65563dd1901bf7e51210bef2896888d602da0f07