Malicious PDF — malware analysis report

Static analysis result for SHA-256 04a5379314dd76bd…

MALICIOUS

PDF

69.2 KB Created: 2021-10-04 07:09:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 67a9b72e9d074d9ba5b9ab06c2d9a422 SHA-1: cf1313de1880da9fbc913ef57d3771a5a788b474 SHA-256: 04a5379314dd76bdbc1beeb97ffcb4889ccf8f9c0d1b6cc2ea4c6f53484bb574
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and links pointing to potentially compromised websites, suggesting a phishing or malware distribution scheme. The PDF structure itself is also indicative of a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://nomylo.ru/uplcv?utm_term=alcoholic+energy+drink+banned PDF link annotation
    • http://phupmirpol.pl/userfiles/file/katibiwupon.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161489c3553d8e---vadupebajamapedef.pdfIn PDF document text
    • http://architettodrabeni.it/userfiles/files/nusatotifika.pdfIn PDF document text
    • https://jdconstinc.com/ckfinder/userfiles/files/jelamedokiponiwalovibulis.pdfIn PDF document text
    • https://emtracing.net/userfiles/file/pezoguposej.pdfIn PDF document text
    • http://abdon.madteam.net/ckfinder/userfiles/files/kazofafafatorudo.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615992a48e911---vubajebunobuzofutogemopad.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/95272851842.pdfIn PDF document text
    • https://xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/zufuxugakikiboto.pdfIn PDF document text
    • http://samuiluxurytravel.com/Uploads/file/70282179822.pdfIn PDF document text
    • http://www.tahi.hu/ckfinder/userfiles/files/36936099030.pdfIn PDF document text
    • https://hotelharmika.com/assets/userfiles/files/7127538420.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/wazepat.pdfIn PDF document text
    • https://4wheelchile.cl/admin/uploads/file/16527474573.pdfIn PDF document text
    • http://bargiel.com.pl/ckfinder/userfiles/files/20414603578.pdfIn PDF document text
    • http://vinhthuan.vn/upload/files/vekulifariz.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/mg1d02o0lkqi8b1oq82vikiu4q/sovasogubewoxebejatiso.pdfIn PDF document text
    • https://on-call-anatomist.org/ckfinder/userfiles/files/83155690192.pdfIn PDF document text
    • https://bibliotheque.ville.deux-montagnes.qc.ca/ckfinder/userfiles/files/15463090962.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/mifejj5n467ans8bg4avsu8ha2/muvoxubomozubufinuwumug.pdfIn PDF document text
    • http://kaies.cn/upfiles/210908132440971734btosgo.pdfIn PDF document text
    • https://yarpaket.ru/userfiles/file/74695939404.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/42962769049.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_off0000b0f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0F9 15156 bytes
SHA-256: 6ebd22d2978d14cb6980b0ba0ec563ef9fdeee7dfc0c7b71f50549cc66f5279d
font_01_sfnt_off0000d6f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF08 10708 bytes
SHA-256: bc170ca352387973ca682bde18f8c4a6bc6c62a728651ac5793c7e2532d9f665