Malicious PDF — malware analysis report

Static analysis result for SHA-256 2631400921c49918…

MALICIOUS

PDF

88.2 KB Created: 2021-07-13 15:29:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 4410ed769f3f5cf926a97b9677bf803e SHA-1: 571d88257bf48278e9fad682981abc66423d4bac SHA-256: 2631400921c49918fc103a5a54e311f59defea88efd7f244811e4d9fa79599ac
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV detection. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of numerous PDF links and the compromised CMS upload link indicate a likely phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/9a93346682fd6264c71838e6d435c0ee/86812592445.pdf In PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160cf8ddf96f91---fezuladutipo.pdfIn PDF document text
    • http://bostonmentors.com/userfiles/file/misananezanusasin.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/ff0780439a439f7b5e0ae5a624ec9dc7/85067678493.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/32138e62660d5ef3b5020736d5d74631/19258450658.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdf9fc10ee5---xebugimemovopesu.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///94773382159.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/lobepekimifiveg.pdfIn PDF document text
    • http://lamdecal.com/Images_upload/files/mesetupovejumix.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac76b9bf9fb---69161257131.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607b19794e108---bavavusitiroxukurov.pdfIn PDF document text
    • http://kartelabasligi.com/images_upload/files/vofupisosil.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160713307f18c0---35634759564.pdfIn PDF document text
    • https://guclupin.com/calisma2/files/uploads/makamabikipezexowajumu.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f20df31435---11986870392.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/3747102086098f9827379f.pdfIn PDF document text
    • https://dubaimotorcycletours.com/uploaded_images/files/xunevejivuxodexevizesavum.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/96962621527.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/613f1b39b8e969980ca9c3b30c7aa3f7/sajuranatuve.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/11558005350.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4edcd8832---71593199304.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/65868444951.pdfIn PDF document text
    • http://cnzgks.com/userfiles/file///6810346408.pdfIn PDF document text
    • https://bloomeng.com/uploads/95582477260.pdfIn PDF document text
    • http://bazis-expertiza.ru/ckfinder/core/connector/php/files/76636561702.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=bible+study+on+the+book+of+ruth+chapter+1PDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/55cefb125c0316a947d94b686c558558/wijepamipedojorupu.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_off0000f508.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF508 11268 bytes
SHA-256: bc08e9963d3250a15c4815e56e7a75c947772330bb5e3c88f738f12ea2ee7007
font_01_sfnt_off00010f49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F49 17076 bytes
SHA-256: c8b3b9a63a3b1f7ad80da0fd558063fe3d36425c4f01133efb9daedfe1a5970e
font_02_sfnt_off00013c0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1