Malicious PDF — malware analysis report

Static analysis result for SHA-256 73ba1e325182252e…

MALICIOUS

PDF

87.9 KB Created: 2021-07-30 20:26:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2263a597c810a05cb266b8ce8ce703fc SHA-1: 20d41cda78b979b3641c7494c6ee2c5d4c3cf2e9 SHA-256: 73ba1e325182252e2d878c09cb1161c781a83291d73ccd4b7aa36ace63531235
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to multiple compromised websites, suggesting an attempt to distribute malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of a 'download' button heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://baxsporthorses.com/userfiles/file/11170568127.pdf In PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/7a6e8252be169d76bb4c0796a97b0904/foxaxojuxomadanitim.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160840a7b17720---34662486773.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ace66ac93f1---suwaw.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/0el9grqo3vh9jcsu88aab5kpm6/lifewotekikanijubajemerap.pdfIn PDF document text
    • http://artdealer.vn/upload/fckimagesfile/87f1ff46bb4a8f7c4db23d58753571e4.pdfIn PDF document text
    • http://medtravel.lv/images/hand_uploaded/files/44818186844.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076d8bf54e27---fufepijumegonirikapilaz.pdfIn PDF document text
    • http://geobigoni.it/userfiles/files/xejukeguxuf.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/p07jqnqskjgsgr660m6um5ka1a/jilodapis.pdfIn PDF document text
    • http://fiumaradelsossio.it/userfiles/files/90744013741.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608a771c8a7a6---85441464278.pdfIn PDF document text
    • http://enerjipiyasalarizirvesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1316e7d6ea---88424215475.pdfIn PDF document text
    • http://sequirk.ie/userfiles/file/40608239093.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160721417ebf8c---40908895494.pdfIn PDF document text
    • https://lexconsulting.ro/webroot/files/media/69835142985.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d8612cd8e0e---55861098222.pdfIn PDF document text
    • http://eurogeographyjournal.eu/admin/fckfiles/file/dametubokat.pdfIn PDF document text
    • http://novichiha.ru/pic/file/96081611460.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/tuzelijikoruneketilig.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf67ed9b9b---muvunederujodikonemupo.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/um7ic1tdk504j52ipgeedkq5u2/81303334637.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/bbcd6326e5a8baf67708e698ded9181c/ridedunokedovuziwekuxowoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=vce+to+pdf+converter+app+v3.6.3PDF 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_off0000ef0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0A 10748 bytes
SHA-256: 4f25944f538151bb9a725005d9db201ffc49d3aaec626ba1d09f41f835e0ddfe
font_01_sfnt_off000107f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F5 17864 bytes
SHA-256: f381542bcc1e1e371084158ec1a53c9092c689165d2764f9197ba9bc3c3d3591
font_02_sfnt_off00013740.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13740 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1