Malicious PDF — malware analysis report

Static analysis result for SHA-256 d49f3464aabdf9a5…

MALICIOUS

PDF

80.7 KB Created: 2021-09-02 02:53:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b71342ba1ba7fb1d4707ecac25756aef SHA-1: 1424ec5a127d0b0b0727cfa81feeba1e5d2add60 SHA-256: d49f3464aabdf9a5aea5137657e46b49f3ad683e42e85a5bdce13686f5be3f62
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The 'utm_term' parameter in some URLs indicates a potential phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://cructi.ru/uplcv?utm_term=eye+pain+with+floaters PDF link annotation
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/5a07bae5ec718d0815b3bde576fde6bf/54287082393.pdfIn PDF document text
    • https://x-software.cz/data/file/jutajoxemizaj.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/lakisibevazi.pdfIn PDF document text
    • http://griswoldremgmt.com/uploads/files/buviviboru.pdfIn PDF document text
    • https://eventpro-kontraktorpameran.com/uploaded/files/6858269071.pdfIn PDF document text
    • https://nhabe.com.vn/ckfinder/userfiles/files/roruzolunare.pdfIn PDF document text
    • http://gyuco.com/uploadfile/files/20210815_235108.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/1591df3b2b59150d0ecd698819dbab25/90406351794.pdfIn PDF document text
    • https://csodamalom.hu/files/files/pojiloxavofupup.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/meguwuge.pdfIn PDF document text
    • https://coffeetuanvang.com/Images_upload/files/33302554442.pdfIn PDF document text
    • http://gemwishrs.com/ckfinder/stones/files/84250139998.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160984492739a7---78876957392.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/98367512250.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/323bf2d4d9923436b3dd2ea59de5b812/nizijuwizuzexok.pdfIn PDF document text
    • http://iberia-ex.com/images/blog/file/43479453622.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021051709502740.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160777552570cf---87092124313.pdfIn PDF document text
    • http://kiuanai.com/userfiles/file/6804021352.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b7329788ba6---pogisabuvubikew.pdfIn PDF document text
    • http://investgeorgia.ge/userfiles/file/zesajadigijujovomesexew.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/a12rk0i5v351ep36hl6tvi7jk6/robubugajupapilafegane.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16086ccdf5ba9e---37412956318.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ad449395a3d0b0dc859d1a8eed3a7e3e/11270128704.pdfIn PDF document text
    • https://mimpiindah1.com/contents//files/nefopilebamavomum.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160a2659617ef9---defekadezegamubebowow.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_off0000d6a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eebd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEBD 10636 bytes
SHA-256: 53b61c18985cead3a644b0ddd291855822fc25bc0a2bc240e7469b1a5dddf3f4
font_02_sfnt_off00010711.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10711 17348 bytes
SHA-256: e3bccbae1493310d3eb0fbf32e9095e878cf6b835f4d0f3f53d09d57e7bb4147

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