Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea4f1d5ee25c0ddc…

MALICIOUS

PDF

88.6 KB Created: 2021-08-25 12:15:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: b1c604528fb5e672aa9e9871a03974e1 SHA-1: 3d30c0d2c0cecfbb3983ebaf5d4974ee843b3ca6 SHA-256: ea4f1d5ee25c0ddc53b3df78902dfb7d85f5d41009af0c158f670a9d50a03ab3
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS uploads. The presence of numerous URLs, including one with a 'utm_term' parameter suggesting tracking, points towards a phishing or malware distribution campaign. No scripts were extracted, and the document body was unreadable, but the overall structure and URL analysis strongly suggest a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://oniceh.ru/uplcv?utm_term=realistic+shaders+minecraft+pe PDF link annotation
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/kv8bglkfakui9bv9peajm3ut32/retegobifideti.pdfIn PDF document text
    • http://normel.org/files/upload/file/62904414178.pdfIn PDF document text
    • https://soalmatematik.com/userfiles/file/lofaza.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/c899af140d3a33482f40df4ba8630f95/93732713026.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a9fffd86034---turelepofaxenesabevamutaz.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/riziliwidulalefoxawavufo.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160855c1ca3fab---10016956206.pdfIn PDF document text
    • http://hotstamping.pl/files/file/sosakoletiridelijifule.pdfIn PDF document text
    • https://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/160799ed9b4aed---penegivuxopefifi.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a129a5ba31a---kiposowabi.pdfIn PDF document text
    • http://jcaf.or.kr/ckfinder/userfiles/files/72150827065.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5cb810f068---90968900771.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/ts6cgstqoacgo2195h4ojpu512/figelumadoz.pdfIn PDF document text
    • http://gpe-el.pro/ckfinder/userfiles/files/nozaruxivajodexufex.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/7v4n3s03bstdacelrbmi8n1q9h/83225925864.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d28eec7b3a---sunexukowezazubezalo.pdfIn PDF document text
    • http://fmafirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/visusubaxow.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/lijotikafuvifovuxabo.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/ditaxibepuwovesudifaxudaj.pdfIn PDF document text
    • https://fajndoktor.cz/images/file/files/ginijuwo.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/a5758f34175009fc4a86e83c3de3af2a/nanasegovogo.pdfIn PDF document text
    • http://chrislahoda.ca/userfiles/file/68555911541.pdfIn PDF document text
    • http://circolonauticofavignana.it/userfiles/files/lokakevuguruzalijexasogi.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/8cmqs0o7n30040kj0j2qduf9q5/wuzagiwomaxom.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/zubuwatetusas.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/f18ivlub0vqspin9lobhiii783/rokafonirizidivesasisopen.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_off0000f43a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF43A 10808 bytes
SHA-256: 2c43cbb071831854ca4e7a6bdce55ff4c97c4b156a1059907efd416fe300cc6f
font_01_sfnt_off00010ce6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124F8 17380 bytes
SHA-256: 3baddb2ef55a3f3e2846756427b3dec691dd59a74ba9b77ed10ab92da6c8180b

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