Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4f6a1960111c01d…

MALICIOUS

PDF

75.3 KB Created: 2021-08-20 04:49:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ddaab8bbc0e248d44feb86d3787db42d SHA-1: 9376b0ab3f8beb938cbf4eb664dc3ed2549407ad SHA-256: d4f6a1960111c01de3eacdb32112a37deade4c0666d96096dde7e0763af69e2f
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous URLs that point to websites, some of which are hosted on compromised CMS platforms. The presence of these links suggests an attempt to direct users to malicious sites for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9939

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 http://skyline1968.com/clients/74864/File/nopixexudomitopovosubuju.pdf In PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/e5357b29142d94253dbd987108c5909f/seneka.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210601021537.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16082906829e78---53126684177.pdfIn PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/42961902838.pdfIn PDF document text
    • https://seerupit.dk/assens/file/zajotiduzab.pdfIn PDF document text
    • http://pilanatofishing.com/home/sandbox/domains/shelter.sandbox.tritek.hk/public_html/ckfinder/userfiles/files/9642349215.pdfIn PDF document text
    • http://erulingua.hu/uploads/content_files/files/51622605854.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee1b4402276---zapejololibokemexatojenog.pdfIn PDF document text
    • http://www.haztartasigepszakuzlet.hu/pics/file/58872516376.pdfIn PDF document text
    • http://namadagaskare.ru/ckfinder/userfiles/files/9503798409.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b39734b3ac---birimenonewitosodofew.pdfIn PDF document text
    • http://willbramephotography.com/kakow.pdfIn PDF document text
    • http://myshopgroup.com/userfiles/files/tetonegolomekusozarufef.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c570b86d59b---69453816534.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/47a9475b0b7fe7c8daab172cfcdd7dd3/zuladiwox.pdfIn PDF document text
    • http://nomorecpapmachine.com/userfiles/files/10807625173.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/4132854289.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160aa6e8fbba51---gupewefokeza.pdfIn PDF document text
    • http://thamcohoaian.com/webroot/img/files/3070656803.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2aecd3ec9a---13860269458.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/pibisunewidepavofubatof.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606f62733a337---wugumepas.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/molusarugotenotudekixot.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/2dd5pvcjp5enst8dmbb1ujd224/gepipikoluvuluvet.pdfIn PDF document text
    • http://tochalco.com/uploads/files/49808631836.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=dichotomous+key+practice+salamanders+answersPDF 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_off0000c40d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC40D 15924 bytes
SHA-256: 3ef5325f3f2034c02c5aaf87f2a85173550fcc90c51fa29d631d8716b54fe6a2
font_01_sfnt_off0000ed12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010529.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10529 11172 bytes
SHA-256: 885941f84c6f95a708573c3e763c34bef44e0304f39507d47b7f7055e3d8fb7c