Malicious PDF — malware analysis report

Static analysis result for SHA-256 65a547d083b3f83d…

MALICIOUS

PDF

97.1 KB Created: 2021-07-23 10:30:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 09665abb015e30fe7c9d24a632626db1 SHA-1: 4d72e7b3bf86c66eb8b10e62a26851535911b2d7 SHA-256: 65a547d083b3f83d66992c7a68b6e3f09761081982ff971a7f76b1e4938b3771
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of these links and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://dtcguild.org/clients/80367/File/62548927620.pdf In PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/vhm1qpamoc5hkljc9tkfrfhaq5/83184356001.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3dc7041d2d---xibukivirup.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/16075b8b1667b3---79992240845.pdfIn PDF document text
    • http://rydelko.pl/userfiles/file/wijasuwadoga.pdfIn PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/16235508645599.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0d93abd75b8c6544112857f394095294/62113654453.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608d0d29cb34c---kukexavobagumezovof.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608591d6eab55---37603061848.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/4acef2bd86f71d05edd2369e634cd8f6/59543653943.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160c923ca56228---28196465652.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/tibajalinobojobi.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8651d5cae---99685433891.pdfIn PDF document text
    • https://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/2iji81oehomhcfg8e9rda1rh6b/52190335551.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608a095aad53f---51301593547.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/82779054032.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/b4afca2b0518a630f32fae68233a5cae/18821925998.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/jrr1smdhf76cal1n2jui95nfi3/weseverekilokowanapuveli.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4f538474c---pexibinazurawivuz.pdfIn PDF document text
    • http://apvn.info/userfiles/file/fidofemosekitivizorif.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608712171d41a---suzoxirewojupedo.pdfIn PDF document text
    • http://veterina-hrib.cz/user-uploads/files/98624700470.pdfIn PDF document text
    • https://waelfawzy.com/userfiles/file/In PDF document text
    • http://kimhoatra.com/upload/fckimagesfile/runezedu.pdfIn PDF document text
    • http://tiga.co.th/ckfinder/userfiles/files/budoroxadopef.pdfIn PDF document text
    • http://legalinet.eu/userfiles/files/69965438141.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=jenna+from+dancing+with+the+starsPDF 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_off00011821.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11821 17148 bytes
SHA-256: 7d49726095e98db88ee971922dfd357e6625518bc68debd6f9c5831e4c06033a
font_01_sfnt_off000144d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144D3 10956 bytes
SHA-256: 9233c4e9fa37ba6e910d7dc1b45b2aff152c8b5c937534515a2e01967a9550f7
font_02_sfnt_off00015dee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1