Malicious PDF — malware analysis report

Static analysis result for SHA-256 bed557c32f0f3b4a…

MALICIOUS

PDF

91.5 KB Created: 2021-09-02 15:04:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 25a56a205abc22c8267ceb15257b3941 SHA-1: a9400c454c34992469f35ba5bde777d45bfd99a1 SHA-256: bed557c32f0f3b4ab9b7e37073c50cbd08d1793ff2ee27ee36b151296b3976b0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains embedded JavaScript and a link farm pointing to multiple compromised and disposable domains, likely intended to redirect users to malicious content or downloads. The use of a link farm on compromised CMS uploads and disposable hosting suggests an attempt to obscure the ultimate malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

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://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

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