Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e8cdcc3cfa101e3…

MALICIOUS

PDF

82.2 KB Created: 2021-09-19 22:42:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 589672e4bd1386bdc67360cb6895e067 SHA-1: 95ac93cf176e624a79f2435acf16540754aa35f8 SHA-256: 2e8cdcc3cfa101e379786e8536092cd64b6995b921e57a7be06b266514164d54
164 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 ML classifiers, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content or phishing sites. The presence of embedded JavaScript indicates an attempt to execute code within the PDF viewer, likely to facilitate further exploitation or payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 http://bluecreator.biz/ckfinder/userfiles/files/wetivazosefuvemaperolani.pdf
    • http://ever0036.com/assets/uploads/ckedit/files/20210906062706.pdf
    • https://akproauto.net/nbloom/fckuploads/file/pavixesazivewowiwimuvokom.pdf
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161315a95667e8---62640877346.pdf
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138d5cab4e7a---rebuxarun.pdf
    • http://zwickerfoto.hu/_user/file/pusepisigumezuwamamixigub.pdf
    • http://larben.cz/media/images/upload/file/wenaxapo.pdf
    • http://kastely-vacduka.hu/fileok/file/nivirugixogofono.pdf
    • https://worldtradezone.com/userfiles/file/biguritoxoso.pdf
    • http://tovicetour.com/FileData/ckfinder/files/20210914_BF5B7B8587EF6E03.pdf
    • http://toyotaquangninh.org/data/dulieu/files/leruvosaxisumaj.pdf
    • https://transmar.biz/ckfinder/userfiles/files/27699743079.pdf
    • https://fratellifurloni.it/file/65266773383.pdf
    • http://myhomeinparis.com/userfiles/files/25595642795.pdf
    • http://pass38.com/images/contentimages/files/sasalato.pdf
    • http://zaintik.org/files/galeria/files/60429153367.pdf
    • http://www.slappedtogether.com/editoruploadfiles/file/muselikajeduneziranesamoz.pdf
    • https://allegypttours.net/userfiles/files/18102518472.pdf
    • http://1-cities.com/blog_images/blog_/file/44036502357.pdf
    • http://wenxuezj.com/images/File/rimelawasasawapevufi.pdf
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/cac5d9e8b5d6c1b57ea1b749d9e6cc12/mapuselajivinilikuko.pdf
    • https://trainova.com/userfiles/file/71971794957.pdf
    • http://nawaress.com/webroot/js/ckfinder/userfiles/files/98746619851.pdf
    • http://coreaad.com/DreamDataUpload/file/nowepaduweguxumubum.pdf
    • https://ardiinerkh.mn/uploads/userfiles/files/29887386207.pdf
    • http://nmways.com/uploads/fckupload/file/xunosuri.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=premam+telugu+full+movie
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcab.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDCAB 16792 bytes
font_01_sfnt_off0000f4bd.bin
4376d0e2e7f3ddcfbe5c18138bcb99dc4ac746da657eeb26d495ab0ab41f44a6
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BD 18112 bytes
font_02_sfnt_off000123b4.bin
923b667bf180747a6946b2fe2a55dd38c63cb5440b2a7392ef9d07377bff3075
pdf-font-stream PDF embedded font (sfnt) at offset 0x123B4 10452 bytes