Malicious PDF — malware analysis report

Static analysis result for SHA-256 6978d059d53f6d18…

MALICIOUS

PDF

100.6 KB Created: 2021-09-02 00:49:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4a51cea862b7974d886687b1880d6126 SHA-1: 9ad045307a3bc5b48c2b3b723e521374130319c5 SHA-256: 6978d059d53f6d18cb635e0d652eebf0fa280b07c825012ca51525be55423477
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains embedded JavaScript, which is likely used to redirect users to malicious websites, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics. These heuristics suggest the document is part of a link farm designed to host malicious PDFs on compromised or disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/678a7107f59a63aa9164289b9b0f0f2d/79150165244.pdf In PDF document text
    • https://kisikana.hr/userfiles/file/20367601857.pdfIn PDF document text
    • http://gibisch.info/files/files/dekoxavigemetuwepaju.pdfIn PDF document text
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/40068424814.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa1bc1b6df---dujilivolu.pdfIn PDF document text
    • http://ventiliatoriai.lt/js/ckfinder/userfiles/files/43987203587.pdfIn PDF document text
    • https://tvsporedi.si/vsebina/46650136675.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/2e285e0659f11d8761d64838f413353e/visabazodinozamov.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdba6a28047---19401348696.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/1d8d080b69c71450e9fdcd4d33f1aab5/bixezilawuzaz.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/jamikusujimaxig.pdfIn PDF document text
    • http://pvhs1967.com/clients/a/aa/aa78cb05297cd93d8a9ab6bd1eb8a3c4/File/vojisefef.pdfIn PDF document text
    • https://vv-alc.nl/uploads/files/96055899092.pdfIn PDF document text
    • http://korean-school.hu/hangul/userfiles/file/wesamizelere.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f91aa75856---fudixijija.pdfIn PDF document text
    • https://swift-tw.com/lcc/upload/files/bijuxigijivumoremisa.pdfIn PDF document text
    • https://lifo-sea.com/ckfinder/userfiles/files/kunuvekikedajafulanefabim.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/39908403652.pdfIn PDF document text
    • https://thaiwoodengames.com/files/upload/files/damofupeneleseto.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/vov9op4ha8hr193sqqvi05p2h6/zupepujoz.pdfIn PDF document text
    • http://redhillplantation.com/clients/1/1a/1a02e1fabf1298af97853074613e4b20/File/43938000120.pdfIn PDF document text
    • http://appletechsolutions.com/userfiles/file/witipaboneredap.pdfIn PDF document text
    • http://pzhjintai.com/upload/files/37675251469.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=fortran+character+allocatablePDF 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_off000125eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013e02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E02 10184 bytes
SHA-256: bafb64d96fe75814f60c7916d3ea4a3aed03b295bea861c7f98c491282c96d82
font_02_sfnt_off000154b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154B5 18632 bytes
SHA-256: f13695752e4cfe0688d9e6358711fb8e8040a3406269c4851d85bb2b76b03d85

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