Malicious PDF — malware analysis report

Static analysis result for SHA-256 461481b2dba6deb3…

MALICIOUS

PDF

76.6 KB Created: 2021-09-05 14:58:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 85ac83642cd6f8f577350fefb1457425 SHA-1: 5834f8d3fc65f583792f4202cc031d088562f217 SHA-256: 461481b2dba6deb35a8e8fe0acd4ce488bae686a867854880043d81f7b391def
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious or phishing content. While no scripts were explicitly extracted, the nature of the links and the PDF format itself could facilitate malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/c7f56337ff453446f9d67bdc50349f99/36464975340.pdf In PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/33km5h3ts42ddas5jqn7f8jcgf/gumofusiwos.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba76ca46301---jukovimetajuxajizedud.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160701430628ee---dobiw.pdfIn PDF document text
    • http://ucity68.com/clients/e/ea/ea220da86df44fb0ae3b7c8e8295ccc1/File/42195896012.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/2aba7e735d2ead79919baa7f2fa4d427/38982132386.pdfIn PDF document text
    • https://xn--80aanugxqi.xn--p1ai/admin/ckfinder/userfiles/files/xuwaworudizogegipegojalok.pdfIn PDF document text
    • http://sinoorchids.com/image/file/gegadenazuwaga.pdfIn PDF document text
    • http://autoscuolecasetta.it/userfiles/files/visetagijojofiwewoseros.pdfIn PDF document text
    • https://superpart.com/files/vejotepakumawuruf.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e569d13bf86---30542312614.pdfIn PDF document text
    • http://wang023spa.com/userfiles/202106file/2021061718353670554.pdfIn PDF document text
    • http://tandprotheses.com/ckfinder/userfiles/files/devadutefisifi.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160bf762b1870b---lugisipabanorigan.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/3a14f5f2b3c5bc0fd87b8e19beca9803/farenuw.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/jokop.pdfIn PDF document text
    • https://daks-96.com/f/uploads/files/97938156287.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/botewevimusexojarog.pdfIn PDF document text
    • http://michelesherrinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/64552181538.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/levibinadekimuduga.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bca118a6e9f---67407797853.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1bcfcb7f60---41030436247.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/72f65c944d1ce15644e3e5201643dc64/49274219798.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=b%C3%BCrkert+8692+positioner+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_off0000c14e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC14E 11512 bytes
SHA-256: f2f170399a6b6fecdc8783cb264940016f100eeb912ea1c7e05f975d321fb5c6
font_01_sfnt_off0000dc4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC4F 17820 bytes
SHA-256: 72cffec90402bcf42b11407e3c1933d1c8a1824399bb91b2312f688a4d3ac5c3
font_02_sfnt_off00010b40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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