Malicious PDF — malware analysis report

Static analysis result for SHA-256 95f0300a15b96567…

MALICIOUS

PDF

75.8 KB Created: 2021-09-05 12:06:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a9d7e7992ef34cabc565a2f006fbe985 SHA-1: 97b229364df88c96cb66cab1ce81dae7d149b83a SHA-256: 95f0300a15b96567415f69e8180766bed817e4a239555ecb29ef8f10f986b37f
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. The primary function appears to be redirecting users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://huntic.ru/uplcv?utm_term=receptor+regulation+pdf PDF link annotation
    • http://princeworldwide.com/multimedia/userfiles/file/xeweresexepisuwixepusozob.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/26028684121.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/tokafutat.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3c51122713---xaseweseg.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/magajidibewikozulupuje.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/90031691922.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/gexowetepuluwo.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bdce8434fec---85638243088.pdfIn PDF document text
    • http://delshadian.com/public/userfiles/file/51722756523.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee0236758f---gunosik.pdfIn PDF document text
    • http://matras-devison.com/upload/file/pitarurufowowafow.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160715326c0ab0---14165991445.pdfIn PDF document text
    • http://tangiahoang.com/skinkorea/Images_upload/files/pizusavikiluramawu.pdfIn PDF document text
    • https://zenit-npk.ru/files/file/sixunikuku.pdfIn PDF document text
    • https://marwaautorepair.com/nbloom/fckuploads/file/towubudigifogowu.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/16088c2b0639dc---tokagudako.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/ffd81779ae598d40c5457a3a104e68e1/25940162181.pdfIn PDF document text
    • http://brlairport.com/images/file/loladinoguvaveloxapub.pdfIn PDF document text
    • http://vatlieubaooncachnhiet.com/userfiles/file/palikonakufosunenaxij.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160847c43b8dfe---27443697527.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/12494979905.pdfIn PDF document text
    • http://qataminational.com/uploaded_files/userfiles/files/38614479249.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/a68ce9681387f6591ad4f044820a1624/xijefupujonazanawavaj.pdfIn PDF document text
    • https://dovolena-jiznicechy.cz/uploads/70549712679.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607caf346de76---nerakufuvugezavozojurape.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_off0000c652.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC652 16396 bytes
SHA-256: 44c41959b9ca755ab62decd54394e1766a267c0dda20c72d136ec837ec8f3f67
font_01_sfnt_off0000f073.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF073 10772 bytes
SHA-256: 5fd55ca91a49d1fb18570a5658d92310a213595364539a95fcfbba85edc13e48
font_02_sfnt_off00010922.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10922 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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