Malicious PDF — malware analysis report

Static analysis result for SHA-256 471dd15c5e6ab78b…

MALICIOUS

PDF

76.9 KB Created: 2021-09-05 03:52:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f45dce8b2d7b7c70d3e7707e2e254a6a SHA-1: 835efd1f5c6df43f1d999ffe9d755006a936e43a SHA-256: 471dd15c5e6ab78bb22d0b277d5d884ca0895c0dee05a07d32485dc0a97d12ed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm or phishing lure. The PDF structure and embedded links are indicative of a phishing campaign, likely using a spearphishing attachment as the initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/9d14c9fb5800538d1ec3ab61bba967c2/vesilig.pdf In PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/a06ea6792e40520c3adeb0985759fd9e/xoxotiwonekufaxaje.pdfIn PDF document text
    • https://sklep-pinokio.pl/web/uploads/files/80846773657.pdfIn PDF document text
    • https://pemaboutiquehotel.com/assets/userfiles/files/83957268592.pdfIn PDF document text
    • http://agama-rc.com/upload/files/76273235453.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/d7823671d85c9d44bbb27d4b090c08ec/lipidimep.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/31450231253.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606defa521c3f---fajevenijokipes.pdfIn PDF document text
    • https://sgicorp.com/userfiles/files/lurerelo.pdfIn PDF document text
    • https://amadesafar.ir/basefile/amadesafarir/files/dugetijejo.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/5dedb183fdcec74311245eb6cd6663c5/famejerejobalenanel.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611e6dd13ea67---31288111765.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6db099e89---59906339630.pdfIn PDF document text
    • http://hajnysport.cz/FCK_userfiles/file/29382978770.pdfIn PDF document text
    • http://graficaeformazione.it/userfiles/file/vudazumorekeratikatopo.pdfIn PDF document text
    • https://medosojewellery.com/userfiles/files/27568681417.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/15905759904.pdfIn PDF document text
    • https://www.rougeindigo.com/ckfinder/userfiles/files/16227684482.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c6ffe0b7cc4---82132503108.pdfIn PDF document text
    • https://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/qgjqpc0n0cp9dtk5omq2plf653/sigugozimapidovatetulafin.pdfIn PDF document text
    • http://smolensk-bakaleya.ru/userfiles/file/bifopen.pdfIn PDF document text
    • http://instalater-macecek.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/kupokanotewonejekutoja.pdfIn PDF document text
    • http://purofirstli.com/userfiles/files/jigazije.pdfIn PDF document text
    • http://beijingteye.com/upload/files/suvejegix.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160986c812e49e---46893616817.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1608f6b8d72081---75647838970.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=across+international+20l+rotovap+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC654 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE66 17700 bytes
SHA-256: 977d858e4e9fb199b9bc40e0daae2d00aa283fa760f61711a9cd3cb935952b38
font_02_sfnt_off00010c8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C8A 10924 bytes
SHA-256: 914668be9f854f0c388e25ab88fb37629f85b890e6b2ded918747ab442e482bb