Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad6c98f8b0c78607…

MALICIOUS

PDF

70.3 KB Created: 2021-09-11 11:46:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fd6396110c9184781576e6f4b29b6cb8 SHA-1: 40e5b94c2f8ea9d299056b08e08df5c00efc7f3c SHA-256: ad6c98f8b0c786070035d0c5885f8ad32ab343dca8f7bbaa033d99b7f7a73dca
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many embedded URLs pointing to potentially compromised websites or disposable hosting. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure suggests it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9131

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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://moneymaker-gold.de/files/52355473060.pdf In PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613afc264f23d---88903216285.pdfIn PDF document text
    • http://kozelsk-adm.ru/files/uploads/files/67883661569.pdfIn PDF document text
    • https://bike-accessories.supersites.gr/content/ckfinder/files/gijorojerezarek.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/0i4frfiejmj3fm0chglpn5jhg9/52405974183.pdfIn PDF document text
    • http://ajisushionline.com/uploads/files/mupepefizafinerevaxude.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/af8337d6ca7dd8b31ba315ff9e8207f3/daxoj.pdfIn PDF document text
    • https://samsungdvmklima.com/upload/ckfinder/files/lejuxo.pdfIn PDF document text
    • https://nguoixunghekiev.vn/userfiles/file/digazanamogotitelokunete.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/41e4073a8d5fa8816e1d8d350fab7998/63740812355.pdfIn PDF document text
    • https://pcetravel.com/files/file/vutazekaduzupiwikepax.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613847adaf12f---36043322410.pdfIn PDF document text
    • http://ambvetsanprospero.eu/userfiles/files/nifusesoxomunadolilije.pdfIn PDF document text
    • http://kondicionery-himki.ru/upload_picture/file/44324306311.pdfIn PDF document text
    • http://achwvs.love-mrt.com/upload/files/69656703135.pdfIn PDF document text
    • https://orrizon.ru/images/file/dubowodedo.pdfIn PDF document text
    • http://www.polni.si/Images/files/puvujibobulavinololele.pdfIn PDF document text
    • http://cdmatik.com/uploads/file/41974440508.pdfIn PDF document text
    • http://sieuthimaynhapkhau.com/upload/files/dimifekosotakilamu.pdfIn PDF document text
    • https://laetitiabernard.fr/images/file/15699082906.pdfIn PDF document text
    • https://china-glass-mosaic.vegner.com/userfiles/files/20210903_170435.pdfIn PDF document text
    • http://bio86.fr/userfiles/fichiers/64787934307.pdfIn PDF document text
    • http://savitapiti.org/ckfinder/userfiles/files/bawirixuwib.pdfIn PDF document text
    • http://alajwakh.com/uploaded_files/userfiles/files/9062494303.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=best+html+viewer+androidPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eff7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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