Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccf210176f58b8a1…

MALICIOUS

PDF

82.8 KB Created: 2021-08-04 04:51:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 28df2d5fadb830949570fa2f2aa2e34e SHA-1: e59680d742a743406429bb8b40f0333c92ca7319 SHA-256: ccf210176f58b8a1e757184bc6b38841d858ab2f7ed61b6407075a9b093eb9b3
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, with numerous embedded URLs pointing to compromised WordPress uploads and other disposable hosting sites. The primary purpose appears to be directing users to potentially malicious or phishing content hosted on these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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://garglob.ru/uplcv?utm_term=isca+2020+slides
    • http://lezeckastenakosice.sk/upload/files/76324351999.pdf
    • http://ekonopuntos.com/campannas/file/50802870749.pdf
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160db26f29d253---75596710305.pdf
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/b003501085b520758e24ad417c7c73fd/32505838008.pdf
    • https://foodphotoshop.com/userfiles/files/92278853889.pdf
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160a6aed2a08e0---sijafaridaxemizit.pdf
    • https://aathichudi.org/userfiles/file/linubiduwupoxepujoje.pdf
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609afc0a3f7b4---42057443352.pdf
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/160911b65b0934---29260353047.pdf
    • http://studiotecnicoarduini.eu/userfiles/files/69175199889.pdf
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/ir6g9jds662jmnc2h44buqcpgs/78916896200.pdf
    • http://knshzj.com/CKEdit/upload/files/49891723291.pdf
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b96cdddf7be---3753623059.pdf
    • http://xn--b1afklwjc5g.xn--p1ai/ckfinder/userfiles/files/98961463029.pdf
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160927955c3ae2---jimuwinerebomifafef.pdf
    • https://confetti-seasons.ru/upload/files/67621170975.pdf
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dfda40b86d---79368175143.pdf
    • http://gianphoiduyloimodel.com/Images_upload/files/witivajaxomigujeranisixe.pdf
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/u71hg66bava4ftlanhesi21kt7/65194926850.pdf
    • http://artospace.com/pics/file/91221711880.pdf
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab809f35577---dopubironekezigabawekab.pdf
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/3663de145ebe6fbf0fc676ca9b0e5fbd/48268588283.pdf
    • https://jasmijnbloemengroen.nl/userfiles/file/sakonuxomotu.pdf
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/66h2fau12tt3ihjb94ibjglujj/xufuzujolufi.pdf
    • https://topclassgardening.nl/images/file/poxebos.pdf
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077f2187a1b7---98756221314.pdf
    • https://patoman.ro/ckfinder/userfiles/files/77696817270.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_off0000e05b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE05B 16792 bytes
font_01_sfnt_off0000f86d.bin
d711ebfac52143ebe25a26c481ca6010d6b39be252d3670eff10d981e8ca36c6
pdf-font-stream PDF embedded font (sfnt) at offset 0xF86D 17056 bytes
font_02_sfnt_off00012521.bin
829d9603790bee82b546ace375cb682498d7f6058143358d7dc03c0d3e934931
pdf-font-stream PDF embedded font (sfnt) at offset 0x12521 10136 bytes