Malicious PDF — malware analysis report

Static analysis result for SHA-256 568473dcf782f87c…

MALICIOUS

PDF

69.1 KB Created: 2021-09-04 19:08:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d02df6c94805edd71b66311ea676bbbe SHA-1: dac4e30ba5c9af6712da0bf614f391bc4e714374 SHA-256: 568473dcf782f87c343fe090f68ecc350fd16820cbb824d94635866d77a53785
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is a PDF identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to external sites, many of which are hosted on compromised or disposable domains. The primary purpose appears to be directing users to malicious content or phishing pages, leveraging the numerous embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://braintreeclinics.com/app/webroot/img/files/tiperifo.pdf In PDF document text
    • http://svatba-emi.com/uploads/pages/files/74814606167.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/girajipevojotomozen.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/88470534757.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/jijirutewodudabisixitoju.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607279019daaa---nusonerori.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/bidulugebi.pdfIn PDF document text
    • https://gullyracing.it/admin/ckfinder/userfiles/files/xumewu.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160803be58afc4---lurix.pdfIn PDF document text
    • http://devison-matras.com/upload/file/mufetatipesu.pdfIn PDF document text
    • http://rydelko.pl/userfiles/file/vomape.pdfIn PDF document text
    • http://hamandeggsclub.com/clients/e/ee/ee862789ee8b59d3f3d22261ccc35c80/File/ruzaxilojatanij.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160b6255a7f692---18045825786.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/3f4bstmmfh843ql227neimfkom/94557646138.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b6ed2062674---43426240229.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/4a3c96396e6ecb66d1a274772763b82d/lejulifeso.pdfIn PDF document text
    • http://hondatayho.vn/images/ckeditor/files/zogarixijewub.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16126f5a3749d8---pefuzopox.pdfIn PDF document text
    • https://www.truckersplantparts.co.uk/ckfinder/userfiles/files/42790433089.pdfIn PDF document text
    • http://makinsushi.com/uploads/files/junigebanigasirepikogu.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/49d355q3j7h8kth475sjf185r1/10833978181.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=cubic+spline+interpolation+method+pdfPDF 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_off0000b1c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1C3 14132 bytes
SHA-256: 5a397186b2c5baa81760ccc4525c504fc83c08030ce8b768fff757176b52371d
font_01_sfnt_off0000d4e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4E8 11156 bytes
SHA-256: a57ae0838b63d96c62d3be4a16569ed690a7160ccac279bc7cfa03b7950091af
font_02_sfnt_off0000ee92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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