Malicious PDF — malware analysis report

Static analysis result for SHA-256 850b817a5c2e73a1…

MALICIOUS

PDF

93.6 KB Created: 2021-06-27 00:51:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5065d1de96b00e860a9644b441e3d196 SHA-1: 276bc95a0a0d3d2f6d9de515e2cb4d9929652e80 SHA-256: 850b817a5c2e73a1bab36f7ead1483c9debccf08f93573af6b2d63b8d8a13203
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to external files hosted on various domains, some of which are flagged as potentially compromised or disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing malware. While no scripts were directly extracted, the PDF structure and embedded links suggest it's designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://hydrem.ru/images/file/jevomonudi.pdf
    • https://tecnibat.net/uploads/archivos/37630447628.pdf
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/445a99a4aaa2369fc80969274193887a/75467932927.pdf
    • http://www.advokat.com/app/webroot/img/fck/file/bobozekibozo.pdf
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd7b3b4a0b---popuzepuguse.pdf
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099cb9936fa4---saxinamedus.pdf
    • https://samarpanbharat.org/trila/userfiles/file/magukijixu.pdf
    • http://anhuifan.com/upload_fck/file/2021-4-29/20210429232002589842.pdf
    • http://stolizstekla.ru/userfiles/file/dedawi.pdf
    • http://xinyuemu.net/assets/202106/files/20210618182835913397.pdf
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/23853442667.pdf
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8cf6a3f1a8---dagojeziwobowalidimifozi.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/eb6547ee79ddbe37327254e663f648de/28043089186.pdf
    • http://interel-rus.ru/test/sites/default/files/file/tikozejinilile.pdf
    • https://binarbaidrealestate.com/public_html/userfiles/file/60924247962.pdf
    • http://nail-free.com/ckfinder/userfiles/files/51842776460.pdf
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/8d7b3c77d443e2ec19bf8b11b5d77a39/99041802.pdf
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/hfmpsh9q0q4v7h5lepv71posrl/wuwififurov.pdf
    • https://ivanamihic.com//files/2450574782.pdf
    • http://bitite.lv/media/txt/122/file/forilol.pdf
    • http://turatabor.hu/media/19370303212.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/ad454be0eccf13fa9ca534673b373c37/25438523101.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=national+building+code+of+canada+2019+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_off00010a2d.bin
4f97e9d8fa1e81a918f7d9b436cc4d2a6c10c34d00ab1d1fb622df29e7c3f271
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A2D 17528 bytes
font_01_sfnt_off000137d2.bin
959788fec184fe9627d4d869e9bab94845f43769958d29bc30447b0320f097e9
pdf-font-stream PDF embedded font (sfnt) at offset 0x137D2 11204 bytes
font_02_sfnt_off000151d7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x151D7 16792 bytes