Malicious PDF — malware analysis report

Static analysis result for SHA-256 f30ec903e256959a…

MALICIOUS

PDF

85.6 KB Created: 2021-08-29 17:50:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 973e3243b9f67a4a5f4986ba1bae8103 SHA-1: 72cc4735f59b276e7bc43bf98a74dea0e167a35c SHA-256: f30ec903e256959a5d8e6c38c29a1fb777bd90c11482bcc907ea6cc9fc0d4241
192 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many pointing to compromised websites or disposable hosting, indicative of a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of embedded JavaScript (T1059.007) suggests it may be used to further obfuscate the redirection or download additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 9

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://smidgel.ru/uplcv?utm_term=how+to+make+snap+video+without+holding+button PDF link annotation
    • http://www.yoko-ono.be/images/userfiles/file/83895895287.pdfIn PDF document text
    • http://thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/83444795395.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/e29d55759b3e453eb7a6a312de8c3514/55792948948.pdfIn PDF document text
    • http://commsoft.nu/demo/ktb/wsmbilder/files/widefosidaduzazaj.pdfIn PDF document text
    • http://limeitec.com/upfiles/editor/files/79608109911.pdfIn PDF document text
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/94271767253.pdfIn PDF document text
    • http://palakkadtourism.in/ckfinder/userfiles/files/25202489106.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/88912a48ac4dfa6bac5db0bea10aa903/11162646196.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0dfc9552f---lesuwowelij.pdfIn PDF document text
    • https://ahl2005.com/ckfinder/userfiles/files/ritotowitaz.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/ilohbgrl6tjuu6lqsouei33qdj/dewepobedujakukomalofes.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/504eac0156a368acf7f5ec6059735112/58313147113.pdfIn PDF document text
    • https://mbamantra.com/ci/userfiles/files/82000309129.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/39451475685.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d798681176d---detelerirusexeg.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/09ddfbb0ed49abc8c2d330ffb17f0e6b/36229643638.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/gipox.pdfIn PDF document text
    • http://gfzgt.ch/upload/file/dadekoveburavukis.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/j6ero82ktd6d5793rpubbsues4/baronu.pdfIn PDF document text
    • http://aranykoronakft.hu/userfiles/file/85348539939.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/6j7eu6mlarvcpes21mbqhculk5/9016720389.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/pobilegegevifabuzanavomok.pdfIn PDF document text
    • 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_off0000e69e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE69E 11212 bytes
SHA-256: f751cbfbca23f03cb38b9aa39367171e655b2342cc37bc80562759a0cdd718bd
font_01_sfnt_off0001003d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1003D 18220 bytes
SHA-256: d14403d6b619118d4ff9d6ab2c110c78579011ffed927b381a755d9ed5f01710
font_02_sfnt_off00012f27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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