Malicious PDF — malware analysis report

Static analysis result for SHA-256 ceecd88bf8654242…

MALICIOUS

PDF

98.9 KB Created: 2021-07-12 23:26:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 48c31daea6bff96ba1837ec86c3d5629 SHA-1: 228ca703e1ae420df656d5e907456292fe3320bc SHA-256: ceecd88bf86542427fec1174e64ac03603dd43c57c1715fe8cd45f1a6e170e9e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress sites and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded URLs and the structure of the PDF suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160746c931153b---67737767583.pdf In PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b96f2136d7a---fegukunanonunedunijuj.pdfIn PDF document text
    • http://ekopaczka.pl/imgbrama/files/4153592998.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/85103542575.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2c3da417c---nosudonigesomekegabopow.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-7-2/20210702151441101296.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9e85882b8---50738009616.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16076c57b562bc---39530734709.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/bp8o63i9inb3rst9jqd3v6tfci/gezemekurab.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/0af64d5c1ef5a7935483442a4414c252/febop.pdfIn PDF document text
    • http://alpinedelhi.com/userfiles/files/sugatemoxakiregunovaf.pdfIn PDF document text
    • https://jaiminsales.com/ckfinder/userfiles/files/vopezoruj.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088f9131e377---mazelajuvobis.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/eee5019da1863daad5354769d1fb5d9d/tiruxenalatag.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/2fd4f2e994ea762d2d150b9b1b0e67ab/zosodagomisaf.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff4a60d9d4---papafovolexezibapadel.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/503309676bdae544cd6a040ff4e2a9b6/tiwizixoleduwuz.pdfIn PDF document text
    • http://kyanite.tv/userfiles/file/65868820777.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/61ef7c7ab6a63d666f1e7526db499964/71494855881.pdfIn PDF document text
    • https://puntoagricoltura.it/file/81361374526.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/zifiwunewawaxisuxoxozo.pdfIn PDF document text
    • http://kapli74.ru/upload_picture/lupukaxoguv.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad96afc9321---konazofozevixebalor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=largest+cargo+airports+in+the+worldPDF link annotation
    • 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_off00011f18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F18 10836 bytes
SHA-256: 73682afea046888a56beb97ce1eb92ee2f1f94132708ff3173b9ad92a1c90e61
font_01_sfnt_off000137e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014ff2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FF2 17692 bytes
SHA-256: a3d2951e9ceef837adbe5801bd94f819733e258269fda5e4f41d8ed7afff071f

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