Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9659e4f2b54dcb1…

MALICIOUS

PDF

136.8 KB Created: 2021-07-05 09:04:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: e2d4e1e7b45656318874a75a64f99aac SHA-1: 43c298dcb4e89b82fe1b65fa468b0a9866ef6ec4 SHA-256: b9659e4f2b54dcb1f8d450593945210bbaa45edd5b91ad7cad8474c394dd7e40
224 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document exhibits characteristics of a phishing lure, indicated by the 'SE_INVOICE_LURE' heuristic and numerous embedded URLs pointing to compromised WordPress sites. The presence of a PHP webshell banner suggests the potential for further malicious activity or exploitation. The document's primary function appears to be directing users to external resources hosted on potentially compromised infrastructure, likely to deliver a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9921

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PHP webshell / backdoor source critical WEBSHELL_PHP
    The file contains PHP server-side code with the signature of a webshell/backdoor (named PHP webshell banner (madspot)). A webshell takes attacker input from an HTTP request and runs commands/code on the server. Flagged as a malicious hacktool artifact even when carried inside a document or archive — the code does not execute from the carrier, but the file is a webshell.
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://cructi.ru/uplcv?utm_term=mnemonics+techniques+for+studying+pdf PDF link annotation
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/plte0rr5bujku4ho74ht8qicf2/xasetaganuvikonile.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608d8273dd917---sawatilegul.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609844432017b---72345573369.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/j9e9psq1o8hkftj7e26nn1d64t/29386518530.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/vidogegesoboraxaves.pdfIn PDF document text
    • https://ka-base.no/images_students/files/xelikimamuta.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b263e459958---40756341437.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/74502010167.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608776c231864---fowinib.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/854a9eb85bf3ebfa49e66125cc386f12/tetuf.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607d43727679c---43712675040.pdfIn PDF document text
    • https://madspot.dk/ckfinder/userfiles/files/46196085191.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/ekgn6r070n1icnted40ooi982h/gibopoferuvoxofinusit.pdfIn PDF document text
    • http://9meclinic.com/ckfinder/userfiles/files/44003318509.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca2fc98460---38734517492.pdfIn PDF document text
    • https://sbufficio.it/file/39272172136.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da872792f24---99169677157.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/15319831568.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/15104881914.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/ta4lmq06pil1llcpdse7fvo5uh/77920887270.pdfIn PDF document text
    • http://geodeslaboratori.eu/userfiles/files/8226070303.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae3c6789807---38863918926.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a423062e621---gubumuseberetama.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001b466.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B466 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001cc78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CC78 17928 bytes
SHA-256: 45a492ac3ce9ee6f1f601f4b846d6334c4acb59698ea83610ea7a3927475d83f
font_02_sfnt_off0001fb93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FB93 11212 bytes
SHA-256: c8ee90fe7bd600709175e12e296d01ec72d68bffb296ac880b745842e0cef3d9

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