Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5908e2cae1e5e13…

MALICIOUS

PDF

86.8 KB Created: 2021-09-03 20:02:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3b0a9fc168d15f3a62c317fd926162cc SHA-1: 3b7c8d7fbc9d89b4f50aa8aff2f2e8b6feaae326 SHA-256: a5908e2cae1e5e13f42f79e6241b1ebd0ccf81d425547cc369dc269999b2398a
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external links, some pointing to compromised CMS uploads, suggesting an attempt to deliver a malicious payload. The presence of a 'download button' heuristic further supports a phishing or social engineering attack vector. ClamAV detection as Pdf.Phishing.Trojan confirms the malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://synerhu.ru/uplcv?utm_term=rrb+ntpc+previous+year+question+papers+download+pdf PDF link annotation
    • http://boracayg.com/FileData/ckfinder/files/20210901_BC8A99550080619A.pdfIn PDF document text
    • http://jyotiacademicpress.org/uploads/file/15757631631.pdfIn PDF document text
    • http://jplus-ag.com/upload/files/BodyFile__611A1B6B138EF.pdfIn PDF document text
    • https://konferencii.ru/js/ckfinder/userfiles/files/67636155847.pdfIn PDF document text
    • https://hotelmitrutarija.com/uploaded/files/96699020018.pdfIn PDF document text
    • http://zangerlelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dajilukawatapuda.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b8cdb21bf---bipitewodipuza.pdfIn PDF document text
    • http://yao-cheng.com/uploadfiles/20210706010625.pdfIn PDF document text
    • http://cochu.net/resimler/files/rixovatolazoku.pdfIn PDF document text
    • http://ng-sons.com/userfiles/file/febulili.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/cee2d8fe32aad6c688e37acdd80f8aca/9110380016.pdfIn PDF document text
    • http://heichapuzi.com/uploadfile/file/subepetedakuruvoredojoz.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609abbafde3ee---76405100362.pdfIn PDF document text
    • http://businessnavigator.in/ckeditor/uploads/files/67471864466.pdfIn PDF document text
    • https://juraganmonyet.com/contents//files/22108122586.pdfIn PDF document text
    • http://wjvanderheidedienstverlening.nl/uploads/file/simivuwa.pdfIn PDF document text
    • http://www.addvanceo.info/userfiles/files/maxipazilonetaminixe.pdfIn PDF document text
    • http://chnli.tw/CKEdit/upload/files/45665625394.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/6hsvqib7uphdg6rk0sflbdflg6/vuxufetoxatavuxofanaviwek.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609eb3bf66b35---gulidafivibevodovunefuta.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16080f1ac0ef08---92835879060.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/80e39c7bc3242403786721fb41599a15/98851444207.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/38427114463.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_off0000e4d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fcee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCEE 11312 bytes
SHA-256: e5f845ae509e0b3e2b9d42639afde984c141265cbca6390cffaea54e14f3417e
font_02_sfnt_off00011754.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11754 20688 bytes
SHA-256: 6f99093826047d2c3ede9c6c80463f259691b44f7eedea9e53fc2baec384c8b2

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