Malicious PDF — malware analysis report

Static analysis result for SHA-256 36d225583a35de04…

MALICIOUS

PDF

84.3 KB Created: 2021-09-16 22:42:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: cc42d2b43f663138a03b326f67f112f4 SHA-1: eda09c6a60eb717e27c953050f6408f567fdd0ba SHA-256: 36d225583a35de04945663dae39b926aa9bca492e9bc005a450286c1bd98f668
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics strongly suggests the document's purpose is to host a collection of links for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://fabriziocar.it/userfiles/files/12261970507.pdf In PDF document text
    • http://ambvet-trefontane.eu/userfiles/files/gosil.pdfIn PDF document text
    • https://ltes2.tw-goods.com/UserFiles/files/29772642196.pdfIn PDF document text
    • http://pmrs.ps/userfiles/file/fefonijeperesijebovumupi.pdfIn PDF document text
    • https://www.ewdel.cz/ckfinder/userfiles/files/mavesewusa.pdfIn PDF document text
    • http://metabolitplus.ru/files/file/38240072477.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/3fff002b01656bc0b74acf4a8b8286ae/tinazezo.pdfIn PDF document text
    • https://fundoohairstyles.com/hairstyler/images/file/kidopezuzukebera.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/c231f553c66f4471995bcb874343d3fd/8371071047.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e0cd536466---78271725900.pdfIn PDF document text
    • http://nonstopsushi.com/uploads/files/48853393836.pdfIn PDF document text
    • https://998.geektic.com/geektic/files/telixe.pdfIn PDF document text
    • https://ashasuchikala.com/ckfinder/userfiles/files/defizefinexifarasep.pdfIn PDF document text
    • https://csp-pub.com/stockages/files/tipemamanoredil.pdfIn PDF document text
    • https://a-1commercialkitchenservices.com/ckfinder/userfiles/files/8466416829.pdfIn PDF document text
    • https://seo-methodes.com/userfiles/file/fowarudu.pdfIn PDF document text
    • https://drhuanghair.com/uploads/files/202109071217186481.pdfIn PDF document text
    • http://nikkenj.com/userfiles/file/xepafojivijuzukigibidakeg.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/161305bb751f01---ramitutijivow.pdfIn PDF document text
    • https://rabudiagnostic.com/userfiles/files/vifureno.pdfIn PDF document text
    • http://xn-----6kcaheblih5ab0a6afqbzoqe.xn--p1ai/ckfinder/userfiles/files/16583289224.pdfIn PDF document text
    • http://studiocastigli.eu/userfiles/files/josizadarojetofusexo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=ludo+cash+mod+apkPDF 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_off0000e32a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE32A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB3C 18600 bytes
SHA-256: 848d20f53fefbdba81b6969a7baf981f1cca6f887d95ac159ff022c32dfe55c9
font_02_sfnt_off00012c58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C58 10356 bytes
SHA-256: 708fce28d0914cdbb1a9dde313e5bd9a160e2fb05a9119806b49fe9c6d356533