Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2819d34622fcd05…

MALICIOUS

PDF

80.8 KB Created: 2021-09-12 11:50:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 822016df365bdd07c96dcba8aaf81513 SHA-1: bf84516e1cdfcfe3561c553b3e902daaf3b3b599 SHA-256: e2819d34622fcd0505fd9acd3d28cbd479a9e843ece1683a1c394a864b6b0ad5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, a common tactic for phishing and malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to lure users into clicking malicious links, potentially leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://willes-gb.com/uploads/files/202109011517077135.pdf In PDF document text
    • http://bdn10.cz/files/file/lunin.pdfIn PDF document text
    • http://skupka23.ru/upload/m/wapadelamunamifitinem.pdfIn PDF document text
    • http://studiotecniconuti.it/userfiles/files/mupebolatanemu.pdfIn PDF document text
    • https://akgoz.zemta.com/uploads/files/41907332906.pdfIn PDF document text
    • http://donauwell.at/userfiles/file/60380283330.pdfIn PDF document text
    • https://leuphuotcamap.com/uploads/image/files/rofunevagof.pdfIn PDF document text
    • http://goldstecq.com/userfiles/file/53207552988.pdfIn PDF document text
    • http://unseretochter.ch/images/file/8715989581.pdfIn PDF document text
    • https://vargyasnekonyveles.hu/kepek/other/file/lifanasigolik.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/2b5ed341fde803f627936b0db9e9ae62/dugejopexis.pdfIn PDF document text
    • http://xy-interior.com/uploads/files/202109061443194271.pdfIn PDF document text
    • http://happyland-nsk.net/ckfinder/userfiles/files/pobetebotomikukiwurimoles.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/13973597779.pdfIn PDF document text
    • http://mtsp.by/userfiles/files/jawojobemut.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/6a5d41e564d9e7300ba3ed6eb2a08d45/10464583102.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a16816ced4---setideworezuxab.pdfIn PDF document text
    • http://www.drivingschool-brno.cz/files/files/35409540765.pdfIn PDF document text
    • http://royalgroup.at/tmp/dodusaferopamam.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/c880a28b6bb8f77f13ce35f14de46201/4331884169.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/94692612852.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136d9086ceef---85014640481.pdfIn PDF document text
    • http://avatars.ru/userfiles/file/15648069718.pdfIn PDF document text
    • https://shastriratanchatterjee.com/ckfinder/userfiles/files/vibixuduxufogavesonelizu.pdfIn PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/jutamatimefisojesunete.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=iphone+active+wallpaperPDF 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_off0000d9b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C3 17324 bytes
SHA-256: 75056f3548a6bd31b5fe3d36a02e120bc6f47d90d73beba47609b1ceac988fa9
font_02_sfnt_off00011e4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E4D 10408 bytes
SHA-256: ae20a4781d76c66b6010b3cefedd4ecf3cebcdcf5516c0a44f7f37726538eec9

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