Malicious PDF — malware analysis report

Static analysis result for SHA-256 336748a172002407…

MALICIOUS

PDF

78.4 KB Created: 2021-09-02 06:57:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 69ee038fcf35ec014e099c6bc7a29aea SHA-1: 2812cf33e0a8a72d3ae14531df43c9bdcd24b01a SHA-256: 336748a172002407de12198dfd550ae8cd2407aec7529df9d90b99542f8ee560
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous links to external resources, many of which point to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing content but serving as a vessel for the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/d4e0c758d058bb78775fd58c50f54b7f/mukosevizelikaralipoteb.pdf In PDF document text
    • http://lucidarepavimentimarmogenovaealessandria.it/userfiles/files/zitiko.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/4527867692.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607aeea09dbe3---77195703908.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16096f4a837b2f---64780640802.pdfIn PDF document text
    • http://johnsonsdynastyincfamilyassociation.com/clients/10108/File/gamizalemig.pdfIn PDF document text
    • http://photou.cc//ckfinder/userfiles/files/89010723636.pdfIn PDF document text
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xifedized.pdfIn PDF document text
    • http://bestorkate.com/uploads/ckeditor/files/63761897139.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/16075095d134fd---rozunofedeguvutetelasob.pdfIn PDF document text
    • http://vds-construct.pl/userfiles/file/fetegafosedojosuwodagom.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/62639937317.pdfIn PDF document text
    • https://ssvacancy.com/ckfinder/userfiles/files/pejamogop.pdfIn PDF document text
    • https://dijitalsanat.link/upload/files/94861842166.pdfIn PDF document text
    • https://loctra.net/userfiles/file/52174625468.pdfIn PDF document text
    • https://em.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/vomejajawonezixurin.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160872077d473e---bowidixuvazarabalovuke.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c241b5f70b---23477003378.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210723154931.pdfIn PDF document text
    • http://cpspcb.com/uploads/files/tafeferidukexiguwapag.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3fbbebba5---90861824888.pdfIn PDF document text
    • https://www.allduniv.ac.in/ckfinder/userfiles/files/39203176774.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/fiperoxodapavog.pdfIn PDF document text
    • http://worldnaturalfood.com/image/upload/File/59669591550.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=socratic+seminar+questions+and+answers+for+to+kill+a+mockingbirdPDF 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_off0000ceac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEAC 11460 bytes
SHA-256: 825607a2335285eed61f82d9feb9ff27b27720b2a1f14fa01480c3bdb24700d4
font_01_sfnt_off0000e94d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE94D 16416 bytes
SHA-256: 20aaf9b395053a8c8766ec447afcf076e81101da013419401a36f842863d25d7
font_02_sfnt_off00011369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11369 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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