Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b444237b940cd5e…

MALICIOUS

PDF

91.1 KB Created: 2021-08-14 13:09:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7a63b5e6e401439277ed537924c9f6d8 SHA-1: e91bbd641551a363d1e4f9f77ee1c208c4ce4154 SHA-256: 9b444237b940cd5eaccedc3faf7f287474d07b5a26ed8292a7dbcf76ab87e9be
164 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The presence of a 'download button' lure and numerous links pointing to compromised or disposable hosting domains suggests an attempt to trick the user into downloading a malicious payload. While no scripts were directly extracted, the nature of the links and the overall detection pattern indicate a likely exploit or downloader functionality, potentially involving JavaScript execution within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pune-india.info/userfiles/file/25108052592.pdf In PDF document text
    • https://clubslotalmatriche.com/calcas/file/fulonu.pdfIn PDF document text
    • http://healingtown.org/userData/board/file/wewexagasiriderawupevazev.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a1c2ca8ddb---18862509171.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082b40e8ae87---3542871345.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/nozomonefotaru.pdfIn PDF document text
    • http://leadershipcareer.kr/fckeditor/_upload/file/ralorajiwelurotumifibu.pdfIn PDF document text
    • http://cobbpaynefamilyreunion.com/clients/862770/File/tijalirinuvo.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d8e589676a---75805974310.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/98505091981.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b306e852c---bojuru.pdfIn PDF document text
    • http://dnepropress.net/files/file/ledinuwupofa.pdfIn PDF document text
    • http://hghs61.com/clients/9/98/9814c5f28b4e93efd1f74733a9fd6b0f/File/97473756524.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/xomuw.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160719fa046550---senutofafojesib.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/27a6dd24e99a38d9e3664a92584200f6/mefigelurakidebarewo.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/bf64767c8c7ad713b5a8ffc67d689fce/38764412047.pdfIn PDF document text
    • http://ankaraeksioglu.com/resimler/files/pejizewiviti.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe8eb105cbb---95613076102.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0114fa4262---sakinafemumerijizelufad.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608844dc68def---wezefuwiditunixadoj.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/398246b8bb123c4b601aa86b3e35d845/mumovaf.pdfIn PDF document text
    • https://pima-alarms.net/slicice/file/49943289388.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/timufir.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd45e17cb2---rosijegunimeneza.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c22531ea559---10258361019.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=hp+print+service+plugin+free+downloadPDF 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_off0000ffc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC1 17256 bytes
SHA-256: 9010c915746ddb61da66e219fb7fa3a59732af0e7abfc996c188bf60b1770cab
font_01_sfnt_off00012c85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C85 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001449c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1449C 11040 bytes
SHA-256: 9a5f6ef8ab30b9fd95cde3f4e97fe4d5765277c4b3d52a3705e0a7b87f9d042a

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