Malicious PDF — malware analysis report

Static analysis result for SHA-256 433d2b21100d9ee8…

MALICIOUS

PDF

77.7 KB Created: 2021-06-28 10:41:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0f846455db7aadc3d02f1e50d21cf044 SHA-1: dd447452aa25a24227ceda58997da06dad034dc9 SHA-256: 433d2b21100d9ee823c650ee0a0503ada8156ec4826fe051bee7024ff464f138
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, suggesting the document is designed to redirect users to external sites. No scripts were extracted, but the overall structure points to a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://inwebjor.ru/uplcv?utm_term=any+link+video+download
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/3e3fe8c4f89418c1b36dc0a80a5edf2b/13555573568.pdf
    • https://daaeportrett.no/upload/file/wuximoratajefirar.pdf
    • http://ladyvenus.it/userfiles/files/dedesiwukafed.pdf
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/s2v9786rh65dc2rjsgtbebln62/82531485973.pdf
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/aecd903e6284a8b49490c85836bc2742/tamusolanonenojobedikezo.pdf
    • http://copelandreunionla.com/clients/6/66/66f6f3de7053633686652f51c4c00696/File/xogovarowomelosaxoxe.pdf
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16081e59585734---82629232108.pdf
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160cb8bf75e1db---pibodusozaretisunulexerev.pdf
    • http://itkaufmann.com/images/fckimages/file/napudeweme.pdf
    • http://amuseonline.com/absite/userfiles/file/xikubinipewejitofisolava.pdf
    • https://rmp-traueranzeigen.de/cms/files/kikuxinesipajokito.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/3a140b2418964a82b009c0aeecca6591/renapuzutivowuzetewojomo.pdf
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/e0afe33015da4c726b49a6d5d62e84b6/nesafariwobabazev.pdf
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ce628dd3b00---95060192962.pdf
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/2a91e822ce7d33ef36e8886a93f95522/resazogovetudogasaruxas.pdf
    • http://wccflooring.com/userfiles/files/tifilabudofirexomeluk.pdf
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3ccb055d5---bidomugoda.pdf
    • https://dpengineers.info/admin/userfiles/file/bojel.pdf
    • https://luathoanghuy.com/uploads/files/sufapixawojeda.pdf
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9b3c62396---88571954696.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a982b7da57e---lujoduj.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_off0000cf66.bin
0acb846fd889c7ca47b9ed88770fe0a4fb0f2fbe85189a6e5a57db369278cff4
pdf-font-stream PDF embedded font (sfnt) at offset 0xCF66 16608 bytes
font_01_sfnt_off0000fa83.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA83 16792 bytes
font_02_sfnt_off0001129a.bin
58d2cec9745bf01942ed026308620bbfcc93b1f551e1389b4fcacadb68233d82
pdf-font-stream PDF embedded font (sfnt) at offset 0x1129A 10216 bytes