Malicious PDF — malware analysis report

Static analysis result for SHA-256 945befcad24ed02e…

MALICIOUS

PDF

91.7 KB Created: 2021-06-30 19:44:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f686a370b3faa7c1bc28dce5501a6969 SHA-1: 31947a2ac3298490855d77b46d41e400e9bbf1e7 SHA-256: 945befcad24ed02e601f8e048085f27bce6bb9634caaec8394bcdc86c313eba8
156 Risk Score

Malware Insights

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

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, indicating it's not intended for human readability but rather as a container for these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://krisoc.ru/uplcv?utm_term=hee+haw+song+gloom+despair+and+agony+on+me
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096cb5ab44cd---15098003706.pdf
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/fa91b6e22a304496411321858d0a1240/zakudidigad.pdf
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160ae4eb1680ce---kapabaxuxuje.pdf
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fbfb242d04---319217649.pdf
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ba7b25edc---wogaragodixofemawus.pdf
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/17e6c08f0f1df2f17fdaffda78e13d69/52592478090.pdf
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/8a268097aa070bdfab2426059c394b0a/mexotinupiluzegexo.pdf
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbcf406c4b---sufizeliw.pdf
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606c98a099e52---ramivedajakorujepor.pdf
    • https://hantverkarenisandby.se/UserFiles/files/14923570431.pdf
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609f8c6eab40b---10761074589.pdf
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16099d8becd55b---65915166461.pdf
    • http://allnatureint.com/userfiles/file/kixamisixiwe.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f24a6ead90---lowibozoro.pdf
    • https://morabia.fi/images/file/noxalasazuno.pdf
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/b0sc7jp8rbsdol10qtfsmh7il4/mevuvad.pdf
    • https://infrastone.com/userfiles/files/8301939906.pdf
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/5a844286deaaa34928a259ee37ca3494/vifejarufuno.pdf
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2b504d122---fofinaxeginolujivufiki.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be54ac859cb---74840778298.pdf
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eb389cf2a1---vimovor.pdf
    • http://salinasouth.com/clients/11073/File/69150677816.pdf
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/58ee4d7b533e71b6d986e9c9057e9b5b/wisezok.pdf
    • http://netmutum.com/userfiles/file/kokowiwawoburinerigelab.pdf
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/f3fcfa5dfa396702e54f06c6ea204754/33313752450.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_off0001030d.bin
da49cf9c20a8805dd630b44ff29ced4a41428630d93884e866b3dba6d9e1646c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1030D 10932 bytes
font_01_sfnt_off00011bef.bin
bcbf41c5786cd64f9981588e97bc9345a8d224779655957d53427135b7b90b21		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11BEF 17476 bytes
font_02_sfnt_off0001497c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1497C 16792 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.