Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d92a1880d4648b6…

MALICIOUS

PDF

86.7 KB Created: 2021-09-07 17:51:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 19b3d67516b4cde75d2dc6e23e6fddc2 SHA-1: 6a173ae5ab6a857d3f807a790021992c26af07cb SHA-256: 8d92a1880d4648b652b0fd2dbf16b334d75cda644cd50ac2f1d6e20c13c65f39
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The file's structure and link farm nature align with common tactics for initial access via malicious documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9744

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 http://zonweringbelgie.com/ckfinder/userfiles/files/sufov.pdf In PDF document text
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/25746964956.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/pj17ds1ad2d1pbbcs5m7kkgfc0/49287843153.pdfIn PDF document text
    • https://mobiligennari.com/userfiles/file/32033596111.pdfIn PDF document text
    • http://ambulatorioveterinariomariani.it/userfiles/files/puxogugaxasugegu.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/fisovuralikojotirim.pdfIn PDF document text
    • http://biurod9.pl/public/userfiles/file/velakasifesugepeb.pdfIn PDF document text
    • https://designcoordinators.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076a1ff74976---wenokibetemorebu.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5fa94f31d---minutokot.pdfIn PDF document text
    • http://bluefield1966.com/clients/26642/File/48918690793.pdfIn PDF document text
    • http://www.eurosecurimed.com/ckfinder/userfiles/files/fofafenure.pdfIn PDF document text
    • http://sakuragiramenandsushi.com/uploads/files/16245687902.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/08ei97ghhdr0n0hrpstsggtcef/gemogamivasis.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/ibtj1kqga0bdjljjcf24h78925/xubojerekibo.pdfIn PDF document text
    • https://samowar.me/userfiles/files/38970202118.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/81100665642.pdfIn PDF document text
    • http://geojeoceanhotel.com/userfiles/file/20210905031542.pdfIn PDF document text
    • http://danchrisjewelry.com/userfiles/file/49892010543.pdfIn PDF document text
    • http://lesbambousbleus.fr/ckeditor/upload/files/jonipe.pdfIn PDF document text
    • http://umffz21.ru/admin/ckfinder/userfiles/files/92903893465.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160bfea528278b---22667776460.pdfIn PDF document text
    • http://georgekoldun.com/var/upload/file/noxara.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609d269c24990---ladaxogozewunasokuvadefov.pdfIn PDF document text
    • http://www.heatandgas.com/EditorImages/file/zifavapaperomi.pdfIn PDF document text
    • https://venusnvs.com/userfiles/file/wenekoxijisapisesizovaris.pdfIn PDF document text
    • http://dogninja.com/userfiles/files/8317645073.pdfIn PDF document text
    • http://mpwlawpa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dabetuxi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=bomann+tsg+707+manualPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d836.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD836 22864 bytes
SHA-256: 1e359f0c74a1411cb7ed9f35e4a4726eaab92215c7da5f3e21c48644e9993ec9
font_01_sfnt_off000111bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000129d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129D4 10452 bytes
SHA-256: 789150d828eb840c4aafd265869bc02803e5bf1dbc0c89fcbc53c5def27cc62d
font_03_sfnt_off000141a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141A2 1964 bytes
SHA-256: cb83427253be486b5dc35224710cea1d2a27078ad6da64da340d8beb93dbb3aa

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