Malicious PDF — malware analysis report

Static analysis result for SHA-256 6af0a3687dd9ee23…

MALICIOUS

PDF

86.2 KB Created: 2021-10-08 05:51:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 019f8aa271f848ecaa26cdbea194f736 SHA-1: 6a3f73dff03e7e44e02d1f6630be3564b78461d2 SHA-256: 6af0a3687dd9ee23d659006d0616a20a733a26c960c7c4f31341b0d3db16bbf2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing lure, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://www.como-grup.ro/fisiere/file/tagorilalu.pdf In PDF document text
    • http://bellina.pl/userfiles/file/jofevunonevidugezaf.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/garebovawupokine.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/161542b3de5b8f---revamibuzepitojego.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/16130acde31fb2---72878383846.pdfIn PDF document text
    • https://borgopitti.it/userfiles/file/36375590696.pdfIn PDF document text
    • http://cyuansheng.com/userfiles/file/sevijig.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/25386596761.pdfIn PDF document text
    • http://rheumatology.institute/upload/content/file/52179287640.pdfIn PDF document text
    • http://suamanhinhlcd.net/userfiles/file/17875287512.pdfIn PDF document text
    • https://rh4-h1tapi-turbo.com/contents/files/24850030141.pdfIn PDF document text
    • https://magnanerie-cazilhac.com/userfiles/file/fekapezot.pdfIn PDF document text
    • http://bburago.info/admin/fckeditor/userfiles/file/9547598232.pdfIn PDF document text
    • http://phucuongplus.com/upload/files/45289988941.pdfIn PDF document text
    • http://hawaii-resort.info/images/blog/file/tevonuwamotegefevogol.pdfIn PDF document text
    • http://hyundai-dongdo.vn/images/files/77697520241.pdfIn PDF document text
    • https://tradegateindia.com/userfiles/file/35791575657.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/63002378a4afb7e063077f3c7b7a464f/98378370145.pdfIn PDF document text
    • http://ptichile.cl/userfiles/file/18018892147.pdfIn PDF document text
    • http://sevoir.hu/uploads/file/kivasavulizo.pdfIn PDF document text
    • http://xmzhj.com/UserFiles/file/gedebiwo.pdfIn PDF document text
    • http://alrabbanoilandgas.com/file/files/47706287798.pdfIn PDF document text
    • http://e-instar.com/userfiles/file/84257502193.pdfIn PDF document text
    • https://diarch.in/WYSIWYGImage/file/85344320527.pdfIn PDF document text
    • http://kunmobile.vn/files/uploaded/20210916/file/39475897869.pdfIn PDF document text
    • http://xn--80aguejfegacgj0ad.xn--p1ai/pict/file/loxopoxodakavetinibedepak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=pull+ups+best+exercisePDF 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_off0000e88a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE88A 10324 bytes
SHA-256: 52f6a3da54fde2c98353087c1f8f84eed663db4c3dca21db330fce518dc8b9fa
font_01_sfnt_off0000ffc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC7 19976 bytes
SHA-256: 011f8387f0dfd5b920f3bcc1d1e7656788b7a2463d154041cc87130c25a234c3
font_02_sfnt_off00013319.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13319 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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