Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4ff09f0c1fd31cf…

MALICIOUS

PDF

75.3 KB Created: 2021-09-16 11:10:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9ad5626151ce265c9bfd2117ae5640c6 SHA-1: 54378a87c5133fea45b186254fe0de3dabce868b SHA-256: e4ff09f0c1fd31cf361cc230bdee98c9400e5118902ef798afcb71d78177fb88
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to compromised CMS upload storage and disposable hosting sites. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://4rrecycle.com/files/file/51430542797.pdf In PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/161356b7d97fbd---geketufejoru.pdfIn PDF document text
    • http://okna-dvere-online.cz/media/upload/upload/file/60728050315.pdfIn PDF document text
    • http://beccaro.it/userfiles/files/tomopawukasexes.pdfIn PDF document text
    • http://bwemfjhjk.friend-match.com/upload/files/88845721035.pdfIn PDF document text
    • http://sloplast.com/userfiles/files/sefaxexiwosabupoxugulodax.pdfIn PDF document text
    • https://giraffeng.net/infodaily/gen-ckfinder/userfiles/files/87898253024.pdfIn PDF document text
    • http://hftyby.com/upload_fck/file/2021-9-12/20210912175532319619.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613101d857b63---39893656603.pdfIn PDF document text
    • https://jeevandeepspecialcare.com/ckeditor/ckfinder/userfiles/files/24155466718.pdfIn PDF document text
    • http://formel1vermietung.de/userfiles/file/44195327681.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613447d01c907---31623571941.pdfIn PDF document text
    • http://interreg-ipa-husrb.com/downloads/7349738583.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/dumanadureri.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/gewiruwerudepuwijedofulok.pdfIn PDF document text
    • https://pmsp-me.com/userfiles/files/41812335726.pdfIn PDF document text
    • https://produktybhp.pl/pliki_user/File/49029595763.pdfIn PDF document text
    • http://spain-ex.com/images/blog/file/39071146212.pdfIn PDF document text
    • http://rotarycochinharbour.org/ci/userfiles/files/30276484874.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/161412cca42a33---rizavovejibigowozulej.pdfIn PDF document text
    • http://hcstonetw.com/uploads/files/202109041328455371.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138e2fccd85e---zoxenobudofexejevora.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=download+hard+time+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_off0000c44e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC44E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC65 10668 bytes
SHA-256: 670d3f062c9283c011b1362b44eb656f44eaffef81a91ec1359e1089b2c1b605
font_02_sfnt_off0000f499.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF499 16804 bytes
SHA-256: edbc91b90b14b147285004b2ed164d51f9352d8784784eee81c9f38e9118ab54

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