Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea9b181e36dbe2b3…

MALICIOUS

PDF

83.0 KB Created: 2021-09-08 08:12:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6067193f92930d43480cc831a1eff404 SHA-1: 46f9fbe651907719ec93f639b4f4285880a2a6ed SHA-256: ea9b181e36dbe2b39ab65b1526bf1132dc438e6f0a085ab6d651bcafda89b39c
164 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document functions as a link farm, containing numerous URLs pointing to potentially compromised or disposable hosting sites. The presence of a 'download button' lure further suggests an attempt to trick the user into clicking these links, which likely lead to phishing pages or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • 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 http://neo-net.info/giganet/files/file/48830984369.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611637221037a---56432237700.pdfIn PDF document text
    • http://market-oborudovanie.ru/upload/file/jejulu.pdfIn PDF document text
    • http://kibbkw.com/uploads/files/figejonorukogutosuk.pdfIn PDF document text
    • http://www.lukoilmarine.com/ckfinder/userfiles/files/86695643786.pdfIn PDF document text
    • https://chogmai.org/ckfinder/userfiles/files/viferexerutaki.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/bb91a76b76860c6f5e746ca6426bcc97/40364367869.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/femexete.pdfIn PDF document text
    • http://yourbuilding.ru/userfiles/files/26369322696.pdfIn PDF document text
    • http://leguido.net/files/letawidabewon.pdfIn PDF document text
    • https://sanvexe.vn/webroot/img/files/jipipokivusagutaxo.pdfIn PDF document text
    • http://cn-noah.com/uploadfile/file/12456364055.pdfIn PDF document text
    • http://tasarimak.net/ckfinder/userfiles/files/wejez.pdfIn PDF document text
    • http://xn--12cmi2byac9cdhd0hra6d7bxkwbgj1gch.com/user_img/files/63042975327.pdfIn PDF document text
    • https://stcc-sa.com/motakamel/Ups/files/41221135791.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1607a28bc235dc---dozaxesikamevojazew.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/f43f2b4d873a0f8a9fa04561c6d7a1ad/tibubowelal.pdfIn PDF document text
    • https://mosallaesf.ir/uploads/ck/files/nenotawivunewefugor.pdfIn PDF document text
    • http://firstcuwire.com/file_media/file_image/file/waluwupuxegivafela.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/161006c7d6480e---laledagimimatotunapazilap.pdfIn PDF document text
    • http://aatmicscience.org/asuserfiles/file/31612748283.pdfIn PDF document text
    • https://fivetc.net/uploads/files/lujaxe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=water+and+wastewater+engineering+lecture+notes+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_off0000da80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f292.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF292 19400 bytes
SHA-256: d64d0e377115af78f360100cc0f1c69b59057cfd739b67cec34cc1a18101c659
font_02_sfnt_off00012444.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12444 10972 bytes
SHA-256: 6fe84844634c57fb1fd5b7fd01391e4dd7e0db0378e1d32f6bfc6fbba0d483ae

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