Malicious PDF — malware analysis report

Static analysis result for SHA-256 eca54f60b25794af…

MALICIOUS

PDF

74.6 KB Created: 2021-09-03 08:25:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b6f83bb363c816303612e925aabf5cd0 SHA-1: 905c1c9adb9bbb8cc22bd264e24f6be56dd3b1a5 SHA-256: eca54f60b25794af14721edd3d94dea89a9cf9a0d442871d1d890c90aa84626c
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The PDF structure and embedded URLs suggest an attempt to exploit vulnerabilities or trick users into visiting malicious sites, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/ade0cb10d61e7ed105e9b9a182f19750/ralexubovelemon.pdf In PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16091aac0af135---27058487291.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/16092779648258---fofarurunapubo.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/02cb0fb501514d3822591b6f6e457a06/tegapebitezonadag.pdfIn PDF document text
    • http://www.agenbenangbandung.net/file/savesebuxib.pdfIn PDF document text
    • http://omni-links.com/images/blog//file/majemutivulobexawejuna.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021062417194181.pdfIn PDF document text
    • https://keralatemples.info/ckfinder/userfiles/files/tuxijojajomuwadima.pdfIn PDF document text
    • http://tetobox-budapest.hu/uploads/files/jomumetomajeruno.pdfIn PDF document text
    • https://autoprofi.ua/userfiles/file/99690346309.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dbe747824e---visuranepi.pdfIn PDF document text
    • http://888chji.com/userfiles/files/39647921100.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/tomosesulibifaxiributi.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/16093ce0138810---figawibeko.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/19l9gnibtglmadm199btg36ogb/2008976722.pdfIn PDF document text
    • http://wintec-samu.hu/uploads/files/86307007240.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/22ed79d327f60398a603d1b65725ee1c/genibiboxuso.pdfIn PDF document text
    • http://www.companyforte.com/imagenes/editor/file/gonukanumurojusamova.pdfIn PDF document text
    • http://parklanehotel.asia/userfiles/file/37990966199.pdfIn PDF document text
    • http://rafaelokazakov.com/file/82842227195.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/95acd16c9579540e38cb6e25830a60e6/tibugipififatalomejuwex.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/i9tg7ifb8kbhqthgsr0e5icfkp/xutetewusalal.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/e0e850385bcfeb8251637e314d32ae64/62396583232.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=urinary+system+summary+pdfPDF 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_off0000c2fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2FC 16020 bytes
SHA-256: e0a4ad229e17de319352760b4b44389ac420cedd24a720ff8a80c59a99ac8e0b
font_01_sfnt_off0000ec08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC08 10716 bytes
SHA-256: 210071aa687f9e84fbcfee6750639e82f630d64726d9012cb85680c02e6a7f44
font_02_sfnt_off000104a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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