Malicious PDF — malware analysis report

Static analysis result for SHA-256 7647b839d83e793f…

MALICIOUS

PDF

84.8 KB Created: 2021-07-30 22:41:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f1172476144f07a257b86eea36977d5f SHA-1: 0c35c7309622d48f95702df71109504879142acd SHA-256: 7647b839d83e793fa2707220f710ec4e9a52b4efb7679504f4ef233ba052bdfb
156 Risk Score

Malware Insights

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

The PDF document contains a link farm with numerous URLs, many pointing to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of multiple links on disposable hosting and compromised CMS platforms suggests an attempt to obscure the ultimate destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://slenderclub.cz/ckfinder/userfiles/files/5030120610.pdf In PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16087f327687fb---wurajavedofolemes.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aa159d19a3f---kepedikimumemubenuvifujiv.pdfIn PDF document text
    • http://lyzph.com/userfiles/file/Fl202107230457356525.pdfIn PDF document text
    • http://chocoenglish.com/_UploadFile/Images/file/7452369065.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/70ec31345a0e7dae92fa28aa0b20c70f/negufufop.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba321b7be62---6486113471.pdfIn PDF document text
    • http://studiocalcinoni.com/userfiles/files/pipinarirodavo.pdfIn PDF document text
    • https://aarhuskortet.dk/images/file/46347577678.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/rijuwirarevabosufe.pdfIn PDF document text
    • http://cosmosimpex.com/app/webroot/ckfinder/userfiles/files/lefovipe.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/sozujane.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/visijeginileput.pdfIn PDF document text
    • https://resulgame.com/calisma2/files/uploads/47878620474.pdfIn PDF document text
    • http://dainichiji.com/upload_ckr/files/35489790731.pdfIn PDF document text
    • http://tianfonmm.com/d/files/nebarupaxelag.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/pipoxukevufolegeranoxade.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b9fdefd1999---tagezolideduzogap.pdfIn PDF document text
    • https://bwawarszawa.pl/upload/file/tabigibubogosumebenavuru.pdfIn PDF document text
    • https://didacostruzioni.it/userfiles/file/3053992927.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/toh4v489s90nq9hu3licrc7ja4/vewizixejivufonilevu.pdfIn PDF document text
    • https://ukmalayalamnews.com/userfiles/file/wodamuki.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/d672c0f6b07b60be5092f7f0caf9e6c6/fupubin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+paint+vehiclePDF 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_off0000eab2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000102c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C4 16872 bytes
SHA-256: b1397bc5a3238575d10f3ec03b0e06c0ad08be87b7d8d6cc0ee45df51b23baa0
font_02_sfnt_off00012e80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E80 10344 bytes
SHA-256: f5df384549fb212f8fc24e50c3a32142d6c79c7f3e227e3a1e1c6f1ebf4c0364

Open this report in the interactive analyzer, or submit your own file for analysis.