Malicious PDF — malware analysis report

Static analysis result for SHA-256 59846a1110a57f56…

MALICIOUS

PDF

75.3 KB Created: 2021-09-12 06:53:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ad8deff28a755995a08b3eeb1d998ccb SHA-1: d1ff8d64fbfe7954b557049dd8eb683afb201c6a SHA-256: 59846a1110a57f56e90cb0d15ff22c7a3f455721dfe083f53cb559cd939a3ffa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many pointing to domains associated with link farms or compromised content management systems. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to serve further malicious content. Although no scripts were explicitly extracted, the PDF structure and link farm heuristic suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://patanjali.zohukum.com/ckfinder/userfiles/files/nazudemesifim.pdf
    • https://www.disbel.es/ckfinder/userfiles/files/darezodawibazigekoruju.pdf
    • https://alrashed-alsaleh.com/userfiles/files/66333644600.pdf
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/b66c1c9582b99abca7fa9c1a6d60738e/19818405611.pdf
    • https://braindevelopmentmaps.org/userfiles/files/dekefulixijusalo.pdf
    • http://studioarchterreni.it/userfiles/files/68247083390.pdf
    • http://lnv-cnc.com/userfiles/file/rokolosizitonex.pdf
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16139d5cd28820---pejuduma.pdf
    • http://fazendasaojudastadeu.net/fotosempresa/files/84969641266.pdf
    • http://purepassion.pl/userfiles/file/17431118353.pdf
    • https://terracell.pt/images/file/gofipubuvusaxukujokataz.pdf
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/60dfbe35e2bce87956cea993885210c6/90921204360.pdf
    • https://pottoka.info/files/galeria/files/dikosun.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139f9ca92d3e---33431135481.pdf
    • http://www.heatandgas.com/EditorImages/file/63530451967.pdf
    • https://abhimaninteriors.com/ckfinder/userfiles/files/21867506139.pdf
    • https://wfbulgaria.com/uploads/wysiwyg/files/jawixugibikowomanafevim.pdf
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wigovuwolopubarimaxujom.pdf
    • http://sirmamedia.com/ckfinder/userfiles/files/jekukixetofibe.pdf
    • http://ydtmuhendislik.com/ckfinder/userfiles/files/kamolosafezowediwokiwuzot.pdf
    • https://aquafilling.com/userfiles/file/vovojonunosawobizisukig.pdf
    • http://nuraski.pl/wsg/userfiles/lazulamutak.pdf
    • https://asiantms.com/ckfinder/userfiles/files/7732419620.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=android+phone+model+number+list
    • 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_off0000c3e3.bin
8b06f093f0ab7488e57d7472bb35a0d17e25639b317a5147268c584a42956229
pdf-font-stream PDF embedded font (sfnt) at offset 0xC3E3 16968 bytes
font_01_sfnt_off0000efe5.bin
6d08ef4214c817db4489977a6403e5cf01f2a6007b91df965024c4e5559efa7e
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE5 10716 bytes
font_02_sfnt_off0001080e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1080E 16792 bytes