Malicious PDF — malware analysis report

Static analysis result for SHA-256 42a4541b0dca425a…

MALICIOUS

PDF

85.1 KB Created: 2021-09-02 02:37:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 3c4515519405d21c71979bb034bed70e SHA-1: 067febb4f37a677f5c38b0c055ccc4652e254992 SHA-256: 42a4541b0dca425a3bd1ed1db395aa1cd756be313b46fc4cf2b025d2e0035041
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm pointing to multiple compromised CMS upload storage locations, suggesting an attempt to distribute malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing. Although no scripts were directly extracted, the nature of the links and the PDF structure suggest it's designed to lead users to further malicious content, likely involving embedded JavaScript or other exploits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://zoekidsworld.com/userfiles/file/nemuzubogonukobapojizip.pdf In PDF document text
    • https://www.campacinter.com/image/upload/File/belut.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c85bd18c055---53428272455.pdfIn PDF document text
    • https://gym-rectif.fr/ckfinder/userfiles/files/magezejik.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1608045d326240---wazovab.pdfIn PDF document text
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/xagemajuz.pdfIn PDF document text
    • https://ruiguoex.com/upfile/files/2021/07/24/vigumebas.pdfIn PDF document text
    • http://bhttourist.com/upload/fckimagesfile/83281212174.pdfIn PDF document text
    • https://arerp.kr/data/file///82019031824.pdfIn PDF document text
    • https://gazelletr.com/userfiles/files/61813232244.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/d6f13a44ad7b564448e770b84713e12b/libunaxadatolutarokige.pdfIn PDF document text
    • https://marathonblainville.com/userfiles/files/kojofazijoritupi.pdfIn PDF document text
    • https://defaico.com/d/files/rumolam.pdfIn PDF document text
    • http://giftboxvietthuy.com/upload/ck/files/jokeka.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160926ed5212f2---44256856936.pdfIn PDF document text
    • http://perfectionistpaintingnj.com/ckfinder/userfiles/files/rasiko.pdfIn PDF document text
    • https://patc.fr/imagesfile/puzet.pdfIn PDF document text
    • http://womenshealthcarenp.com/clients/2/29/29a32d4da59f0b4eaa4573e1354aeabc/File/92145154295.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da50de488bd---fowomimuganazek.pdfIn PDF document text
    • http://sergey-yushkov.com/pict/file/12580223477.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610ebffeab028---40209633542.pdfIn PDF document text
    • http://www.siposferenc.hu/html/wojosezutipepod.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e697cf3fd8e---11315055650.pdfIn PDF document text
    • https://bushregenerators.net/userfiles/files/64673935252.pdfIn PDF document text
    • http://geologocarmignani.com/userfiles/files/duxujavadirijut.pdfIn PDF document text
    • http://thevisionkharj.com/userfiles/files/37093980738.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=nguyet+anh+duongPDF 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_off0000e3a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A4 19736 bytes
SHA-256: 496209c6234a1a46d781de046bbaf6b8cf2baad20e8dd0d0b8a69038aa7c946b
font_01_sfnt_off0001177a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1177A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F91 10312 bytes
SHA-256: 03498bdb684871981b8db3461f4d32f8d9cc73df3bef60b0779737e41402ad97

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