Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbde223c535e0b84…

MALICIOUS

PDF

75.3 KB Created: 2021-09-10 04:15:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 89daad31bc088d981407b6692d1c4472 SHA-1: 0d4e581ceb4dea3df6cbb713830d9e8afe4a4a79 SHA-256: bbde223c535e0b849e4486a1c5832c8223be7ea4c1a35f1bec812af8cd894f98
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://tunapvietnam.thietbiotoviet.com/Images_upload/files/mebitesowusonimevojegowu.pdf In PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/bfoa7gr5pct0miot6p39rus84h/zuvonefumivofanexuna.pdfIn PDF document text
    • https://advik.net/userfiles/file/96477757109.pdfIn PDF document text
    • http://pokrowce-ochronne.pl/Upload/file/5898777726.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/fasijovoji.pdfIn PDF document text
    • https://0924055971.com/uploads/files/202109022212218917.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/xajibagowaziwosemaruvisi.pdfIn PDF document text
    • https://yapluka-services.fr/userfiles/file/gidowisudibimas.pdfIn PDF document text
    • https://unitytradefze.com/ckfinder/userfiles/files/66573537629.pdfIn PDF document text
    • http://sromedical.com/file_media/file_image/file/nedodetuzuwunozifenapubi.pdfIn PDF document text
    • http://ximangsongthao.com/app/webroot/uploads/files/37510792459.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/1cae3ed307e5353c95d62878ce8e5295/witedebumen.pdfIn PDF document text
    • https://carmelocuritiba.com.br/ckfinder/userfiles/files/dopukudopomabasoruborod.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/47390293653.pdfIn PDF document text
    • https://wronba.pl/uploads/wysiwyg/file/gafosuwot.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161367c16c7e94---76278673192.pdfIn PDF document text
    • https://marjoyunlar.com/calisma2/files/uploads/vojuben.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/53601217548.pdfIn PDF document text
    • http://traviet36.com/upload/files/zorise.pdfIn PDF document text
    • https://pellevah.com/upload/files/tubarifixakijosonor.pdfIn PDF document text
    • http://lovesenergy.nl/file/56641692857.pdfIn PDF document text
    • https://juraganmonyet.com/contents/files/kekabulana.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/52595378802.pdfIn PDF document text
    • http://premo.at/userfiles/file/47988833100.pdfIn PDF document text
    • https://adtw1.com/ckfinder/userfiles/files/27120833014.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=sites+like+craigslist+casual+encounterPDF 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_off0000c3f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3F8 16668 bytes
SHA-256: 2d3839c0f57c0ac095d020b52d5be5a6a6c729c01bf062a3cd676cbe4488f959
font_01_sfnt_off0000eec3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC3 10672 bytes
SHA-256: 3b4a6485a55821f8c2c51ff8d2cc70deb0b511e3c4ff53a8b8eae23e74c6b1f9
font_02_sfnt_off00010755.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10755 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1