Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad709eef8fca57fd…

MALICIOUS

PDF

82.7 KB Created: 2021-09-11 19:26:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 10a01d085d5f743817a80a7f6ae0b57d SHA-1: 1e3dc5ada38a750e4d2acbfa62ff1a16e221b7d3 SHA-256: ad709eef8fca57fd2913d9d08e243586d1576b673b5cd7030735239c826f9cd7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains embedded JavaScript and a link farm pointing to multiple external PDF files, some hosted on compromised WordPress sites. The embedded JavaScript likely facilitates the redirection or execution of further malicious actions, while the link farm serves to obscure the ultimate destination and potentially spread the malicious content across various domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://redemaisfarma.com/userfiles/file/bodijaf.pdf In PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/8288b4308fc8a02107a7e7ec30474f73/ropumupugupiwa.pdfIn PDF document text
    • http://thrifty-uy.com/files/others/72435189674.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132df4d2e449---vonevisafu.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/65361116528.pdfIn PDF document text
    • https://www.hemingway.bg/app/templates/js/ckfinder/userfiles/files/vamalepopan.pdfIn PDF document text
    • http://gardensyellowcab.com/admin/images/file/83191558357.pdfIn PDF document text
    • http://studiopedrazzini.eu/userfiles/files/zaliruwidas.pdfIn PDF document text
    • http://interiorsexpress.biz/dayafter/uploadimages/newsimages/file/nupetijixujakorofokerak.pdfIn PDF document text
    • https://rpdev.org/ckfinder/userfiles/files/pijafesibuwigotena.pdfIn PDF document text
    • https://beldapin.com/calisma2/files/uploads/81608841824.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/rosezidapati.pdfIn PDF document text
    • http://lateonsettay-sachs.org/userfiles/file/liwesevafadofabepilaz.pdfIn PDF document text
    • https://fotojursa.cz/userfiles/file/dadikevojalalafugodimol.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/a0ii98fq6d7qp8u934ms2e7qm0/95415760942.pdfIn PDF document text
    • https://rarahil.org.np/ckfinder/userfiles/files/51850745603.pdfIn PDF document text
    • https://triatlonshop.cz/userfiles/file/32951237674.pdfIn PDF document text
    • http://tao-oita.com/admin/upload_filesfile/zuferonuxawakekugavopajaz.pdfIn PDF document text
    • http://tivati.com/uploads/userfiles/file/lexejagepexow.pdfIn PDF document text
    • http://tasarimak.com/ckfinder/userfiles/files/86828357521.pdfIn PDF document text
    • https://yourownadviser.com/ckfinder/userfiles/files/robesatupetesa.pdfIn PDF document text
    • https://podgoricki-klub.me/userfiles/file/jujagokokovafoloruposasa.pdfIn PDF document text
    • https://www.prieur-equipement.com/ckfinder/userfiles/files/57373006966.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161388a79f4030---widis.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///vilomazibadutujazepajumif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=games+android+2021PDF 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_off0000e01b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE01B 17492 bytes
SHA-256: 11cd4921258937c78a60b2aadf1935ace0b979821ae219378c546690fa9809ac
font_01_sfnt_off00010d02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D02 10596 bytes
SHA-256: c5bca9d85e0e648185229cba207316b200f27ddb1ed305f4598bd211c4944112
font_02_sfnt_off0001253e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1253E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1