Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2d9881688e76169…

MALICIOUS

PDF

77.3 KB Created: 2021-09-01 23:14:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9223c52281af3d1e7c3bc13a74657ffc SHA-1: e6fe18ae2d6941559b1620ae708ac065df975149 SHA-256: d2d9881688e761698d23fe856e089a9013b8daeee3aeb0a151f9b104a90ce53e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious sites. ClamAV detected this file as 'Pdf.Phishing.Trojan-d2568dad23a94d95', and an ML classifier also flagged it as malicious. The presence of these links indicates an attempt to facilitate phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://pistant.ru/uplcv?utm_term=conviction+meaning+in+bible PDF link annotation
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607d67353adfe---sepijewoxamik.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/5943367524.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd2c865838---jubus.pdfIn PDF document text
    • https://alpinismbihor.ro/app/webroot/files/userfiles/files/8389930210.pdfIn PDF document text
    • https://hoangnhataudio.vn/media/files/74829498916.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/85747706359.pdfIn PDF document text
    • http://bikipvuikhoedep.com/app/webroot/files/editor_upload/files/mexebatugeresanuguge.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/d2f6a77f8f09fc8645fd9af1346fa259/74140720487.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b03679b239---vumapax.pdfIn PDF document text
    • http://cartonwrappingmachine.com/userfiles/file/kalixepefutafugaboke.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/bagofape.pdfIn PDF document text
    • http://t-eamplus.de/web/editor/files/31353341690.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/24922301944.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c507acd57a7---27600579949.pdfIn PDF document text
    • http://knuhpharm.kr/userfiles/file/20210618203812.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160700af17f246---busalawi.pdfIn PDF document text
    • http://goldenpeak.it/userfiles/files/34815214315.pdfIn PDF document text
    • http://sushimura1.com/uploads/files/bajuxeseseweraxininezowu.pdfIn PDF document text
    • https://eminesenlikoglu.org/resimler/files/vosugojaz.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b246c44ade9---31978282997.pdfIn PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/retufafa.pdfIn PDF document text
    • http://slippersymposium.com/clients/875641/File/28728217651.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/f9266irvtoa0i0vrpla31p3dhs/vebegisideteliritixofafan.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/41220813402.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075d627af17a---keruk.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a3ce997185b---jotavarabolijajebilixaz.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_off0000cb57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e36e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE36E 10540 bytes
SHA-256: aa6cec8a0ee00b05004236f35dbaeae3b65a2955953415b486298bc23be39140
font_02_sfnt_off0000fb7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB7A 17572 bytes
SHA-256: f2696d76b5e6ef7d6211e68e10932b47d5adcc90c261ef657da5d1f532b65ac0

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