Malicious PDF — malware analysis report

Static analysis result for SHA-256 90a46c9800fe1743…

MALICIOUS

PDF

77.1 KB Created: 2021-09-01 04:59:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1a9114b8e3b58ed397333c013b370a32 SHA-1: c6abafe2dccca2449c0267dfba1f95d6535d3ec8 SHA-256: 90a46c9800fe1743732efc7e228ed110d6696dc00a902e107c3ffec54375015b
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure itself appears to be a link farm, designed to redirect users to potentially harmful external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 https://nomylo.ru/uplcv?utm_term=can+you+pull+your+own+tooth
    • https://floridagreatescape.com/media/file/24276767320.pdf
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/5p2jrlheojbu387du28nejtg0a/winupesaverimek.pdf
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/36m9j0ve8cqoc3v51emb85rskk/lowanodovozanag.pdf
    • https://topinsolventa.ro/userfiles/file/wonuro.pdf
    • http://noospc.ru/SITE/files/editor/file/63145026482.pdf
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16082f30742c64---xamigobisujujifu.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/80cf1835fb18feda8c59dfab19dacca6/51323023761.pdf
    • http://shreejians.com/userfiles/file/bugunomex.pdf
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee7e7330b2---67430955674.pdf
    • http://maszyny.pl/userfiles/file/98073445356.pdf
    • https://quatden.vn/webroot/img/files/xenov.pdf
    • http://viviapalermo.com/userfiles/files/tafewewuzuxavutapev.pdf
    • http://moto-bike.pl/userfiles/file/gojiwudolekufo.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607053df6aaee---pozufafakusetenidipusako.pdf
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/161293547ce1d4---jabadodelobemojas.pdf
    • http://amon-syotengai.com/userfiles/file/20614302471.pdf
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c563510f766---wesiloxalezewarili.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/161180fb97fc02---68281679029.pdf
    • http://balalajka.nu/media/37095917421.pdf
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160803c5d20324---vogitegisowokoxuzu.pdf
    • http://www.jfac.kr/ckfinder/userfiles/files/wizewidivitotulaxisiwafe.pdf
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dad0e5cb0e1---44899545390.pdf
    • https://betalinktech.com/blmedia/file/jawutalifidonarame.pdf
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210623155555.pdf
    • 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_off0000ca4f.bin
a2327355d2e8b250f3b256e9e6b9e6a27e6bba78fb4c8e279eb1fd401d5c210b
pdf-font-stream PDF embedded font (sfnt) at offset 0xCA4F 17140 bytes
font_01_sfnt_off0000f6a0.bin
f45731b18124906648a3c72e684b1acd2c237e5d935dd6f0b2ba95fbcc7fcde4
pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A0 10288 bytes
font_02_sfnt_off00010dd4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD4 16792 bytes