Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5ddd17aca3c06a8…

MALICIOUS

PDF

81.6 KB Created: 2021-09-08 21:05:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: e61c0002a9541a17f0a430f80493c5fb SHA-1: 3abe0dccd39c6c3c94b87da09ccb652e94243501 SHA-256: b5ddd17aca3c06a8c469b765b204aee6fcdee551e262ed9184c795ef7223d312
164 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, many of which point to compromised CMS uploads and disposable hosting, indicating a link farm designed to obscure malicious destinations. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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 https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/546ac9efaa26ae08c64bd4940fa7c33b/41731053092.pdf In PDF document text
    • https://nieruchomosciturystyczne.eu/files/file/bivinavu.pdfIn PDF document text
    • http://anpharma.net/upload/files/fozanuwelewadag.pdfIn PDF document text
    • http://balcimimarlik.com/resimler/files/zugomiwunupazig.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/95bdf039cc39bd72e958f652195a3857/78265313946.pdfIn PDF document text
    • http://ffarchitettura.it/userfiles/files/sinig.pdfIn PDF document text
    • https://adesso-moosburg.de/images/file/32962351324.pdfIn PDF document text
    • http://almawred-sy.com/files/adminfiles/files/95632081770.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/161307c02d50e7---noxan.pdfIn PDF document text
    • https://sporyolu.com/resimler/files/butukojababelab.pdfIn PDF document text
    • https://omnistopbollards.com/application/third_party/ckfinder/userfiles/files/jogukipul.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16130612942994---91747569058.pdfIn PDF document text
    • https://falconshipping-uae.com/userfiles/files/lerimugelenofoto.pdfIn PDF document text
    • http://romento.com/uploaded_files/userfiles/files/14478564301.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/bef0d7fb384cf0962118547cd84c353a/3468917422.pdfIn PDF document text
    • https://registracijakoncar.com/webroot/js/ckfinder/userfiles/files/misumina.pdfIn PDF document text
    • http://bukvoznaika.ru/ckfinder/userfiles/files/76402438114.pdfIn PDF document text
    • https://zenmobile.in/jaipriyart/uploads/files/lexofanode.pdfIn PDF document text
    • https://biocoils.com/img/file/69041401883.pdfIn PDF document text
    • http://bastola.org/userfiles/file/5658746885.pdfIn PDF document text
    • http://thinhhoanggia.vn/Images_upload/files/10876989799.pdfIn PDF document text
    • http://eventechsite.com/files/files/43153530008.pdfIn PDF document text
    • https://cakenflowersonline.com/userfiles/file/zodobuminoxizejetunazi.pdfIn PDF document text
    • http://dreiseengrundschule.de/files/5211854895.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161386065822f1---sexiliji.pdfIn PDF document text
    • http://shijijiaming.net/filespath/files/20210904195913.pdfIn PDF document text
    • http://holdemigny.fr/ckfinder/userfiles/files/11402662324.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=organic+chemistry+practical+viva+questions+pdfPDF 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_off0000d837.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD837 11516 bytes
SHA-256: 53728bd00bf4a2e7e8e5c610920c66f70bf4fecab57265a80cbcea7a2cfffc4f
font_01_sfnt_off0000f2e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E2 17548 bytes
SHA-256: 4c19674260e2b2420c2676b6934c80359e23d19a2c8da923882189d3055c7184
font_02_sfnt_off00012030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12030 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1