Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ebb524137107776…

MALICIOUS

PDF

89.3 KB Created: 2021-07-29 20:14:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a75b0ac3b5b99d94cc3e959348a62a4b SHA-1: c6dbdf8423d9b6193001e82483a97c025b4a5a3a SHA-256: 9ebb524137107776dfaa733d614dc700cda86238be96cdf9bb95be764c6b3c2c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple compromised or disposable hosting sites. The presence of numerous links to PDF files hosted on various domains suggests an attempt to distribute malicious content or conduct phishing attacks.

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 http://jshtextile.com/UserFiles/file///72647500019.pdf
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce2038f3849---zagutexoxe.pdf
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/ed71683c181a6975fa1696e4979a17b0/koxetaduzaverivujikazok.pdf
    • http://www.hermosabeachbungalows.com/userfiles/files/79282551843.pdf
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/0c0cb5b369fa28c1dce0751387da2db2/45148405553.pdf
    • http://geometrabottero.it/userfiles/files/33121234809.pdf
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096e502781eb---kosomovetasejo.pdf
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/e60721fa0f8771f1c4d715bb1252f09c/delowaguzadabitipikojelur.pdf
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0129c4ea6c---vuzexebipavof.pdf
    • http://bydnjl.com/userfiles/files/74513518643.pdf
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160705f467e0b0---vanasasigaxak.pdf
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/gilo9crrqjhsotirpnu8kd3q92/44534838714.pdf
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adec8f83901---35037823510.pdf
    • http://24cvety.ru/upload/files/95216908136.pdf
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160a62cca9d0e7---tanixidimaxutewijo.pdf
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/e86fa92e06ed2785c275e5cb53205ce2/83101116903.pdf
    • https://noihoithanhtuan.com/media/ftp/file/2987514407.pdf
    • https://catwalkdogcome.com/editor_upload_image/file/gonezid.pdf
    • http://debandhelder.nl/ckfinder/userfiles/files/76346684814.pdf
    • http://sjhtractor.com/d/files/bimativ.pdf
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/c62f3533c9ff5f23b613b6263235cd8a/votinesuzeman.pdf
    • https://traonguoc.vn/wp-content/plugins/super-forms/uploads/php/files/b37ouu1eb1l23v90lhdeslogd9/40591775909.pdf
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ae81a63bf39---sulukonafareb.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=how+do+i+setup+a+wireless+home+network+on+windows+10
    • 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_off0000f768.bin
cedb86f0a115bb02071e977104ee55ddd49f2b9d96ece713dd5b93f2ac5f719a
pdf-font-stream PDF embedded font (sfnt) at offset 0xF768 16800 bytes
font_01_sfnt_off00012323.bin
afce05cbb5ed27d274d3cddeab7f2c8aabdda129069c0cdbbcef853f0b0ee7c7
pdf-font-stream PDF embedded font (sfnt) at offset 0x12323 11100 bytes
font_02_sfnt_off00013ce1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13CE1 16792 bytes