Malicious PDF — malware analysis report

Static analysis result for SHA-256 da2279772c7fe306…

MALICIOUS

PDF

92.0 KB Created: 2021-09-02 15:04:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b4e67eb3c0a790e0dc483e59ce13abf4 SHA-1: a63f499fdec649f96d4d6c16af8ee1da356f162b SHA-256: da2279772c7fe3065892d7d893b80fcf5fe3121f915510beb8c17b3f0b3a32be
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The presence of numerous links pointing to compromised WordPress uploads and disposable hosting, combined with the 'link farm' heuristic, strongly suggests an attempt to distribute malware or phishing content. The ML classifier and ClamAV detection further confirm the malicious nature of the file, likely serving as a downloader or redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9902

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.
  • 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.
  • 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://edusfera.pl/upload/file/86496971050.pdf In PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/37649464983.pdfIn PDF document text
    • http://secoinblock.com/upload/files/81900078537.pdfIn PDF document text
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/darisaxukowawul.pdfIn PDF document text
    • http://iehyun.com/editorupload/file/87735125486.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071ebb0573cc---femiditowexabatedukeb.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b0d0187a419---40011722180.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/ugqvqo822j3da35edic4ucbgig/62591748044.pdfIn PDF document text
    • http://mylodge-naoshima.com/61925678941.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/dd48d0285bdfafc24eda666620ad4290/fagibeduzab.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608021adda1a5---rogimovividebixamone.pdfIn PDF document text
    • http://aircond.md/upload_fck/file/62288805264.pdfIn PDF document text
    • http://hzqzg.com/d/files/labewitexu.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/2473214452.pdfIn PDF document text
    • https://condicionamentofisico.com/arquivos/file/80099914448.pdfIn PDF document text
    • http://aiken7050.com/clients/5/51/510ae66c864a6d23552e02d1b5190e2c/File/mujosozelabi.pdfIn PDF document text
    • http://www.armstrongre.com/files/files/97259368157.pdfIn PDF document text
    • http://dakmet.pl/upload/50772730534.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16086188331f0c---ravuxu.pdfIn PDF document text
    • http://webelievedin1984.com/clients/6/67/676624d6593aa512bfa6e10e765af00e/File/kalasogativomixabaposimad.pdfIn PDF document text
    • https://www.santaterezinha.com.br/js/ckfinder/userfiles/files/bukesabunadibo.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/47259144171.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/mtsm7thngdaiplfp9umloftbo7/vigibatakiremamawena.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=pdf+book+free+download+urduPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B3 16244 bytes
SHA-256: fddcbe21bdf9fb2753729b4ab5b26d7a3fbb01e3fe51d41ab0725360e25c189d
font_01_sfnt_off0000eba1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000103b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B3 25012 bytes
SHA-256: 61b27b82bff4673baba350d0c47e477656ed5ccefca7af418afcfe40b2d6b04d
font_03_sfnt_off00014181.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14181 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_04_sfnt_off0001497e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1497E 10408 bytes
SHA-256: 75a46bfaa070c9fd0670ff301f7425ac32944a0e280345931bcae73301c03207

Open this report in the interactive analyzer, or submit your own file for analysis.