Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cd5fdb01800a5a6…

MALICIOUS

PDF

88.6 KB Created: 2021-07-19 17:33:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 4ae143159f23bfdf3ee93cf06a0a2e59 SHA-1: 45b8cbc63a65b7ac9ca7d34c0a8f553c44f7cc9b SHA-256: 2cd5fdb01800a5a698512a67853e054cbd358e0f921c5a6d5044be697a6bffed
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to potentially compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of multiple external URIs and link farm heuristics confirms the document's purpose is to redirect users to external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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://rchs1964.com/clients/5/58/580abc73d3aac4ea3a2bdd7c75327783/File/6577392164.pdf In PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/f9d12592aca409eec96a29c3776fba32/fexut.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/a3vul93dnv2ucortnq9t86oqu7/siporebiwewujege.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a846be61a78---fabajunowit.pdfIn PDF document text
    • https://schlosshotel-murten.ch/userfiles/files/lorekovegew.pdfIn PDF document text
    • http://dambi.pl/userfiles/file/fusazepere.pdfIn PDF document text
    • https://metal-et-verre.ch/ckfinder/userfiles/files/galorenepowumixiretigenur.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/5adaa5319c5c4f9d772ef77b8eed93e2/64841850401.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae9c79cd429---7539969649.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb93906dcfb---21320893699.pdfIn PDF document text
    • http://luatsuphutho.com/upload/ck/files/wekowibilawajitaxubegivij.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6aca464c2---kinubiwelifegeb.pdfIn PDF document text
    • http://illinoislivestock.org/userfiles/file/fozozexuvozoge.pdfIn PDF document text
    • http://nceed.kr/pds/userfiles/files/58120848669.pdfIn PDF document text
    • https://tenekedjieva.com/uploads/file/kowijujupob.pdfIn PDF document text
    • http://dblbtech.com/userfiles/file/29127155356.pdfIn PDF document text
    • https://miaousland.fr/ckfinder/userfiles/files/32964725599.pdfIn PDF document text
    • http://vitalenzyme.com/uploads/fckupload/file/xapikivivegixopanimabir.pdfIn PDF document text
    • https://greenlakepaint.com/ckfinder/userfiles/files/85014231257.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/80111002301.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ba1238e1796---ruverugi.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/xavowusekirupevilufofose.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=simpsons+the+officePDF 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_off0000f9b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000111c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111C9 10512 bytes
SHA-256: bc432ad97aead725c38ffce08e603bcd79665a9d49367e99537ba4d7b90065c8
font_02_sfnt_off00012977.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12977 17000 bytes
SHA-256: 94c28969bbaa34bbdad2957fe9f577660c9298c7031b1168cfa84729af59b867