Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ddd8c7ef2fba675…

MALICIOUS

PDF

99.6 KB Created: 2021-09-15 13:30:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 80d4e8ea9b51b5aeb48ce5e8556d066d SHA-1: ebd04a92d289ac0402d73b9e4f950546acadafa9 SHA-256: 5ddd8c7ef2fba675311f53a8695630b5c9746754a83f4ee33e0f4d31651813a9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the nature of the URLs and the heuristic firings point towards a malicious document, potentially leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://pixomot.ru/uplcv?utm_term=descargar+juegos+de+android+para+celular PDF link annotation
    • http://keralastatetailorsassociation.com/userfiles/file/paremoribakerofezuxojef.pdfIn PDF document text
    • https://globalcircle.club/userfiles/file/jojozevikituk.pdfIn PDF document text
    • https://pmfegypt.com/userfiles/files/41119417668.pdfIn PDF document text
    • https://europawindow.com/app/webroot/img/main_content/files/28686678944.pdfIn PDF document text
    • https://at2-turbo-j3t.com/contents/files/redafiva.pdfIn PDF document text
    • https://groupunsur4.com/contents/files/nibevazepisesevelutirugo.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16139c3770b688---falusuzemor.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/89119722360.pdfIn PDF document text
    • http://julianina.dk/upload/file/kobonina.pdfIn PDF document text
    • http://xn--z92bzy85x.com/userData/board/file/16456873066.pdfIn PDF document text
    • https://fa-vietnam.com/webroot/img/files/taluru.pdfIn PDF document text
    • http://avanti-kuhni.ru/upload/files/35532935498.pdfIn PDF document text
    • https://jjpremiers.com/files/98439445387.pdfIn PDF document text
    • http://slovbau.sk/test/userfiles/file/61088515457.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/60e303f5cf2310242b2227865b3a165a/lokifimuduzalekufubipubis.pdfIn PDF document text
    • http://geyuping.com/geyuping/uploadfile/file/2021090808380573499.pdfIn PDF document text
    • https://imaggu.com/ci/userfiles/files/95548922704.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd31c6b4cf---85949076743.pdfIn PDF document text
    • http://newtrichur.com/userfiles/file/buluxikaneberuger.pdfIn PDF document text
    • https://currenwatch.myhost360.cn/file/upload/files/09-05-08-58-09-24.pdfIn PDF document text
    • http://thaifilmind.com/UserFiles/file/25331303805.pdfIn PDF document text
    • https://e-tta.com/app/webroot/userfiles/files/bimawupexabategipefesa.pdfIn PDF document text
    • http://mjacz.cz/soubory/files/wafotakifuni.pdfIn PDF document text
    • 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_off00011cea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CEA 19908 bytes
SHA-256: fbaf5aee0a8bcaa790b6af468a6b6fd9d0b436c92a37d9ff2df34bf9f42e5ae0
font_01_sfnt_off00014f96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F96 10820 bytes
SHA-256: 57215380ac234e30b3c959e1479b350250b1579b71fdf8b678f3d7aefc933ea7
font_02_sfnt_off00016864.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16864 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1