Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec8df8e557c8b787…

MALICIOUS

PDF

83.7 KB Created: 2021-09-08 11:55:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e1ae1f16ba48b54ee5379741c2d2e641 SHA-1: e79e917f5407f093f1cc95c79994a88fd9ed9a44 SHA-256: ec8df8e557c8b7872146c824860fa35e2b019506235515d5f2f50e78da08d60b
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the links and the PDF structure suggest it's designed to exploit vulnerabilities or trick users into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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://u15.ch/ckfinder/userfiles/files/dipuwesitujejepijeb.pdf In PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608d4682913f0---fulazevanojajipusos.pdfIn PDF document text
    • http://studiopetrilli.it/userfiles/files/94465709894.pdfIn PDF document text
    • https://igescanada.com/ckfinder/userfiles/files/3376120650.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/lonofibixojugonikidewo.pdfIn PDF document text
    • http://mimarkamilozkartal.com/userfiles/files/72125856791.pdfIn PDF document text
    • https://siam-royal-view.ru/data/files/75024035502.pdfIn PDF document text
    • http://adbrf.com/files/fckeditor/file/1139337998611b519e2087f.pdfIn PDF document text
    • http://esportenerd.com/app/webroot/ckfinder/userfiles/files/59346151364.pdfIn PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/wanibofilox.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c85b78387df---jonuduranulepofafigiz.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/9igl2nj6fkl2u3cdjofn7tl867/21371911186.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/fb56c1b4786375e5d27c51310a59612c/862702039.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/19995371955.pdfIn PDF document text
    • http://dynamic1984.com/user_file/file/4803168312.pdfIn PDF document text
    • https://chasehr.in/userfiles/file/18282532931.pdfIn PDF document text
    • http://tekizolasyon.com/ckfinder/userfiles/files/dizulopunasebigowi.pdfIn PDF document text
    • https://thegioibaobicarton.com/Images_upload/files/vixawufag.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8aa767730---jamikogifekipikataji.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/14899088568.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608a02d047bf8---bivebofevasesenuxopig.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/mv0ao7ig6de9ho1i04ne6h2ca1/vefimamikaritavekubebiza.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/24099cc3d614b45b5a940de016fe4030/49709652674.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=criminological+perspectives+a+reader+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_off0000e1bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1BC 11060 bytes
SHA-256: 70dd32412bf293976662a56420ad19efa408d1525aff3a6c2848a838f5f8f4cb
font_01_sfnt_off0000fb55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB55 17732 bytes
SHA-256: 78c9ea5120bbc0a6caba1f9633264e7607424f5e4a7d965bcaf669b542cc71d6
font_02_sfnt_off00012932.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12932 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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