Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c4b17364efb9342…

MALICIOUS

PDF

90.3 KB Created: 2021-08-07 23:16:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2f97d4e4d436126206a0ddee93df9a16 SHA-1: b01a3f63663be36d4861433998f6a816609d0626 SHA-256: 8c4b17364efb9342b9b3e47d655d26d562c11abcb58c4be8d07a839e79ff5936
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. No scripts were extracted, but the structure and URL targets are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160d320fea8f7b---dobipifamupulesel.pdf
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b05658d8719---sakelaf.pdf
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/c06c2efb096058b3fd2ce3bb734cd026/roduwopilewalejejuvogu.pdf
    • http://sancheonglittletheaters.com/upload/userfiles/2021/07/files/210705181039.pdf
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160742a479af4c---69607105647.pdf
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/642eb46ba2b5a49ace77e9e03aac0e4e/54010289526.pdf
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/gisb34j8vmnb6c5mb6d44fdod9/67376319718.pdf
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/a6da864d64d8ab4777e5b581d3f32624/masogozegujatato.pdf
    • http://clingac.es/d/files/32628685704.pdf
    • http://bjbtrh.com/files/pic/file/72862832938.pdf
    • https://itracmediav5.com/ckfinder/userfiles/files/sanariw.pdf
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4b6e91ec46---83076061976.pdf
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160997a235f76a---javugubula.pdf
    • http://qkmedica.com/uploads/userfiles/file/68422306564.pdf
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/kkur901jgq6iuqgcft282jlelg/28394398118.pdf
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4626b9f817---54133820115.pdf
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160b0654b09ad4---befozuvefonokujene.pdf
    • http://kawoka.com/userfiles/file/70979923343.pdf
    • http://wshs67rocks.com/clients/9/94/942520bde836a0b401740df6f3d23d35/File/51618496317.pdf
    • http://ajmason.com/admin/ckfinder/userfiles/files/robaxijolebo.pdf
    • http://albino-pitti.com/pub_img/file/98935773896.pdf
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e3be403b97---logarazusivomiba.pdf
    • http://amadpich.com/userfiles/file/44408957414.pdf
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/0f858a83b1d27033bf3cedb7cfdf30c2/36787544352.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=samsung+galaxy+s6+edge+plus+sm-g928v+firmware+download
    • 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_off0000f9bf.bin
7d74f222487e43325d0ccf3209567e476767e1bdb043b86c98a0be5e279af199
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BF 17088 bytes
font_01_sfnt_off00012650.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12650 16792 bytes
font_02_sfnt_off00013e67.bin
8fa41c69960a116ee66ff336e1c2358d43d0484e50ee6527851efd8869cd08ae
pdf-font-stream PDF embedded font (sfnt) at offset 0x13E67 11984 bytes