Malicious PDF — malware analysis report

Static analysis result for SHA-256 dff51617bd3090e3…

MALICIOUS

PDF

82.0 KB Created: 2021-09-15 15:58:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a4568315a309c242f7da05b0b41e029f SHA-1: 48989adf3dbd781eab05b9d841ae00e744b02cc7 SHA-256: dff51617bd3090e30c0bd739b0b4601d3727f0ec706adb68c9d4ee5f82850e7d
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://oniceh.ru/uplcv?utm_term=3+letter+words+starts+with+a PDF link annotation
    • http://greenglobepms.com/uploads/18258150314.pdfIn PDF document text
    • https://actor-conseil.com/files/file/tupiluzukatobem.pdfIn PDF document text
    • http://pho32shabu.com/uploads/files/lumigomarogumu.pdfIn PDF document text
    • http://bebaldebaran.eu/userfiles/files/25802347907.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/tulasoxusasodapumojutaki.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/161332aaad3a82---27881748068.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/80173297017.pdfIn PDF document text
    • http://skinct.com/upload_file/file/Fl202109022004131294.pdfIn PDF document text
    • https://12shio3.com/contents/files/nijesifikirememunotepo.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/hajrgt1iikc3o6vq3haimr2pvi/kagafi.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613a5a6fae019---41253684044.pdfIn PDF document text
    • http://vce34.ru/attachments/file/84960820930.pdfIn PDF document text
    • http://vipacademy.org/userfiles/file/sonefezumoboku.pdfIn PDF document text
    • http://thietbibepnhahang.net/media/files/liwobivasozega.pdfIn PDF document text
    • https://koratspring.com/upload/file/62877865622.pdfIn PDF document text
    • https://k-newsletter.com/ckupload/files/malanomidanif.pdfIn PDF document text
    • http://grafosaleservice.cz/images/fck_editor/file/67183638602.pdfIn PDF document text
    • http://lsneotek.com/ckupload/files/jobexilivase.pdfIn PDF document text
    • http://makesrealsense.com/ckfinder/userfiles/files/45306859295.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/32182273942.pdfIn PDF document text
    • https://tutorlookup.com/ckeditor/ckfinder/userfiles/files/nuxiju.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/18098438919.pdfIn PDF document text
    • http://nanchang.chinatupai.com/web/js/ckfinder/userfiles/files/5817996410.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_off0000db75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB75 18064 bytes
SHA-256: d02c9c9bbdbbd069d49525868e3ceb1d4d7e42bf1b86636088be4cf810225598
font_01_sfnt_off00010a34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A34 10404 bytes
SHA-256: cb9f647f3eabea7cf2a7085a08016cca64d8397764c916bba6a3fb04bbcbfbce
font_02_sfnt_off000121f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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