Malicious PDF — malware analysis report

Static analysis result for SHA-256 53350d28f5500769…

MALICIOUS

PDF

110.8 KB Created: 2021-07-16 19:43:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4465e3ab04fd05c63ab46b07218a7819 SHA-1: 4ae7eeffd2276483fa3bd87eb8d86d7cb219d7ab SHA-256: 53350d28f55007695f359a205461a5eb819fd1882262009db4bf79a1c02dedc1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links to compromised WordPress sites and other disposable domains, suggesting an attempt to redirect the user to malicious content. The document body is unreadable, but the presence of link farms and the overall detection indicate a likely phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9868

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://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/bc2f08c8f1b355c575a8200cdfc5d3cf/68107268497.pdf
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160872de991e88---23171230086.pdf
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1609876b8e155f---tixomosulubegasi.pdf
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/780b6a199b95aa942701b6180cde6f1e/zoviparobofelujuliwufewo.pdf
    • http://aceonlinementors.com/userfiles/file/tarugiragifega.pdf
    • http://icloudcleaners.com/uploads/account/autoresponderfiles/5047772574.pdf
    • http://mpwlawpa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/76100647360.pdf
    • http://cnhhgj.com/upfiles/userfiles/file/pisakefuturifuwedod.pdf
    • http://ingmontagna.com/userfiles/files/72490212400.pdf
    • http://verkaufs-akademie.com/userfiles/file/44815873138.pdf
    • https://fruitssupplier.com/app/webroot/img/files/zanevowominekozawunewu.pdf
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/d2f5b05eb6255a97943573b908f735d8/nivasuwifososugewuvomimiv.pdf
    • https://www.herewardcarpets.co.uk/wp-content/plugins/super-forms/uploads/php/files/24v2hphqcpul04u9cgp3lvs33u/19949802178.pdf
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16078323e3d478---waveveragugubuzokuzaxo.pdf
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/a1846b6a203f66e1b6db0944ea5ef16e/30097027097.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/muxuluxetetapuwalexe.pdf
    • http://duonglaohanoi.com/userfiles/file/pimag.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6081a249dc---nipikomewexufowosenedow.pdf
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/wedoselido.pdf
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160d704a59975a---58714782055.pdf
    • http://suarezbeltran.com/aym_images/files/44727833835.pdf
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160b674285502a---fexaguwuninugodol.pdf
    • http://doggystylzgrooming.com/admin/photos/file/32951924651.pdf
    • https://jmtours.co/aym_image/files/kebapekexigazenax.pdf
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/05847f06879848aab6ba85f065d89082/33919152781.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=most+widely+spoken+chinese+language
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000115c1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x115C1 16792 bytes
font_01_sfnt_off00012dd8.bin
9e8dcea0c75ce29cd420262810324dd81819df11a6846589e8ef553931bfbebb
pdf-font-stream PDF embedded font (sfnt) at offset 0x12DD8 11080 bytes
font_02_sfnt_off00014782.bin
97d8eb8b636612c174dda0218a13f37e23d61ccb235f0f605e270277117cb882
pdf-font-stream PDF embedded font (sfnt) at offset 0x14782 20520 bytes
font_03_sfnt_off00017923.bin
77d290c612716d3635740c19adad81cdeea240b5e68c82e98b55b47476f3753b
pdf-font-stream PDF embedded font (sfnt) at offset 0x17923 18428 bytes