Malicious PDF — malware analysis report

Static analysis result for SHA-256 471b859eed8054b3…

MALICIOUS

PDF

71.4 KB Created: 2021-07-13 19:26:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 343a34a1ae9ae497ffe54fbf6c32f08a SHA-1: 1afe20c30f85082ba6a8063f5ece5c432d0c1274 SHA-256: 471b859eed8054b33e0d462c4db6911a289d9ac48e53049113234ad0fb9e73fa
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to distribute further malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, indicating it's not intended for direct user reading but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160847b60db2e5---lojajerukovotegiga.pdf
    • http://omonetach.pl/foto/ilustracje/file/sovibupimijaneli.pdf
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/rc76vcj58m1mk2ncbuo662rbb3/rokajapasopokanebogok.pdf
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcc8ff77efa---91874797921.pdf
    • http://kinel-hunter.ru/upfiles/file/juxar.pdf
    • http://alkanboya.com/files/file///44985568070.pdf
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160c664e6121ea---nupelete.pdf
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/7ebprftrddnum5di4cvunptrek/52314861009.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/d3m2tes299d74a7a7pvs8otpq6/26819063410.pdf
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099ef8c5b363---dotupujebixudeporukoxoz.pdf
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2461dcbcd---45939451191.pdf
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/5eb5910908a4bee82117f776c5e78252/80467483372.pdf
    • http://cdseoulps.com/uploadfile/fckeditor/file/vudufatufa.pdf
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/87ea5cf60a16a3436b019f3f22396ec2/towisa.pdf
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1637a634e---wokanujo.pdf
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/996851079c6e38729486a71353b2dbe5/60814212216.pdf
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607399f800601---bibinigazi.pdf
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8b762e59a5---77486167095.pdf
    • https://dbjadow.pl/attachments/file/wixoni.pdf
    • https://nepalimodelagency.com/userfiles/file/83353999488.pdf
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/k8q2fv5f7ktl4msoagcrua0uvs/95330706223.pdf
    • http://nanobubblevietnam.com/uploads/userfiles/file/xupadawujuxeku.pdf
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9ced773f4---rapofemuzizum.pdf
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6e8445b8933689d77931b8c686bbd3d5/jujosel.pdf
    • https://burgaseguros.com/userfiles/file/17685525715.pdf
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/abda9e8fc8befe0def14bfc136687ba9/mefipanexosaduvijonaxa.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=the+mailbox+worksheet+answers
    • 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_off0000b956.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB956 16792 bytes
font_01_sfnt_off0000d16d.bin
6701627d635a76ae64df1ff6484ac1cf6c00f1cc8f484fc33ed0418218babcd1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD16D 10756 bytes
font_02_sfnt_off0000ea0d.bin
38503b439733b53f44cb0c897cf2764ae6441b1d0865a5881ab3f044b8acb303
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA0D 14880 bytes