Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbc54c94f1878d3f…

MALICIOUS

PDF

156.7 KB Created: 2021-09-02 16:52:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4ef1da218d57a864cece5c83a80ec8a1 SHA-1: 08098a6b7a49f5abc8e24df9fa6feab42bb28ed4 SHA-256: cbc54c94f1878d3f5c55b6ddc2ddad52996f4365ae85f4f001f5f5cad27221e6
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish users. The embedded URLs and the PDF's structure indicate an attempt to lure users to external, potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

Heuristics 6

  • 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.
  • 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://elmbbq.com/uploads/files/gujixofavoge.pdf In PDF document text
    • https://frontivo.ro/userfiles/file/fuwuwagope.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1607905227d7a7---ravazijuniwosapejaka.pdfIn PDF document text
    • http://copelandreunionla.com/clients/6/66/66f6f3de7053633686652f51c4c00696/File/lupejumevigis.pdfIn PDF document text
    • http://dentish.ru/ckfinder/userfiles/files/fojuvazaxivu.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/tt008kjehj6gov0sj2jtm1matb/mevurazoleteku.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612f71ab6dda8---selazeke.pdfIn PDF document text
    • https://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/41809297172.pdfIn PDF document text
    • http://goldway.jp/upload/board/file/fuzox.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/gdakg0hbmtqg023lnp3bqp3vq6/tewokaxeb.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aac4a4bd2da---35176463511.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/v2v6794gfrl8fg8eejssj3gp4n/21325380893.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160760643ccca2---95850095019.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c94312ea3f---sobumujemanumuziroziga.pdfIn PDF document text
    • https://linker.tw/files/zagebetex.pdfIn PDF document text
    • http://vetportonaccio.it/userfiles/files/xaxiri.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/8bf76ac514353dec2b060e5a71e4c066/pugevidozikedebamuxejowab.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/19736256207.pdfIn PDF document text
    • https://www.ndgai.com/wp-content/plugins/super-forms/uploads/php/files/skbcre5sc81mpjfkfhtj9hrgsl/gaseriwosilagopes.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/mo83g9lhpljp4eu6skca9as9lc/99833553820.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/6f1df5312c4f5d7f4c0031940d9b4e7e/wapibidiliguxiguwufik.pdfIn PDF document text
    • http://pokebarslo.com/uploads/files/viruk.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afc8e841bde---paxuzuzegulusutujopegi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=political+violence+and+terrorism+pdfPDF 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_off0001fc66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FC66 10848 bytes
SHA-256: 2adbaf34ec0ffe6f0776d6e0460d7868790dcd2dc401a5a46acd58b58062727b
font_01_sfnt_off00021573.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21573 21092 bytes
SHA-256: 11c50a9c0678c5409905f664ab99d56520e384d31f7ecf2812c81c2cc034655f
font_02_sfnt_off00024d00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24D00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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