Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c52e6882fbc18f2…

MALICIOUS

PDF

92.3 KB Created: 2021-09-01 03:18:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 45944515602a7c86dee04c28c7283b77 SHA-1: 0af08b36b21d778c088322300f7fe44489e24589 SHA-256: 5c52e6882fbc18f2de191f17ca03f75ff1f2a136e488eed2b74f23b4bae5f974
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. The presence of embedded URLs and the overall structure suggest an attempt to redirect users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://archism.ru/uplcv?utm_term=best+french+songs+of+all+time PDF link annotation
    • http://detikakdeti.ru/img/file/supexisenuji.pdfIn PDF document text
    • http://adhdesign.de/userContent/files/20210607224449-6027480617.pdfIn PDF document text
    • https://parkettworld.com/upload/files/93093950811.pdfIn PDF document text
    • https://niagarablock.com/application/webroot/userfiles/file/tukerazas.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/20686020957.pdfIn PDF document text
    • http://szentistvanpatika.hu/upload/file/tegizifobojokavifobufubix.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/miwomomoxowemogivida.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/bbc02459451cdc08e36327905639319a/41736739451.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e1b1b4dc8a---56301060372.pdfIn PDF document text
    • http://nanopena.cz/upload/file/pusajunosejetopudamuvigex.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/gexumisiparemawituvanajuw.pdfIn PDF document text
    • http://resheto.ru/users_images//fck/file/xisalifukodatido.pdfIn PDF document text
    • http://cuacuonnhanh.vn/Images_upload/files/rewapawele.pdfIn PDF document text
    • http://canphantich.net/Images_upload/files/93803438443.pdfIn PDF document text
    • http://supragyn.cz/userfiles/file/vogopi.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/2ap9a8t9v0v7m93u9om7gh26g3/fuzuvozikekogobegaru.pdfIn PDF document text
    • https://thic.muki001.com/plugin/ce1/ckfinder/userfiles/files/xajejozizedoniwirofolero.pdfIn PDF document text
    • http://jinanxintiandi.com/userfiles/files/dagupekizevixabaropiku.pdfIn PDF document text
    • https://carea2plus.com/wp-content/plugins/super-forms/uploads/php/files/56fe32aba15018d044a55708588acf32/68924280745.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/184909bd6efa579abb52b6eb66d16ac8/53686483544.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c26032189b6---kakatolikibik.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1c17816d1---48655933753.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/h2nhrges5p74t5sbl0qesunr27/44608670604.pdfIn PDF document text
    • http://gadkowski.pl/repository/filemanager/file/93438159070.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_off0000fe92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE92 20020 bytes
SHA-256: 8be47e28e9eb37b16c86d7bf92c71538119d9530435f54576bcde8dc55e9af42
font_01_sfnt_off000131a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131A4 10836 bytes
SHA-256: dd8061da61a2fe98a9aeed31efcaa7c679183f044b69f99dd20e0a846d954bc1
font_02_sfnt_off00014a80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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