Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bb3ea7b366043df…

MALICIOUS

PDF

84.4 KB Created: 2021-07-08 02:45:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 155433d57af6f8a9bee4ae582749ca59 SHA-1: c2bdc8cdcdf0bf12e91a13d090a3de17d1e1fb4f SHA-256: 5bb3ea7b366043df6a7b774bf7dab6bae3ce3040926178969256f3d755ac2b34
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing or trojan. It contains a link farm pointing to numerous URLs, many hosted on compromised WordPress sites, suggesting an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and link farm indicate a phishing or redirection attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://studiopignotti.it/userfiles/files/41803282362.pdf
    • http://artecgroupservices.com/imagenes/file/nipaxufasobitatosakowo.pdf
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2fa6540c1---tapikalapu.pdf
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/3c647c8243d11faa6b09b2b8c5a6de25/nokaroworizowiwejajuva.pdf
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160863b423d358---4793069225.pdf
    • http://slsnn.ru/content/file/jowuk.pdf
    • https://thietbidiensino.vn/media/ftp/file/14906201983.pdf
    • http://digemnd.com/UserFiles/file/gamigativaragas.pdf
    • https://avistravel.ro/userfiles/file/63316218364.pdf
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d5ce96a4a---belagadaxevejasogif.pdf
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b24227e3b2a---47728172409.pdf
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16076eeaae95e0---35892731541.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/c07b684230d344a18caf8f20417f4fa7/manizagogezosikuxu.pdf
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/c0d848655de2c238b7ef2757945ebea2/weparatas.pdf
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607a632233af3---55269358898.pdf
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c9b692772f9---fawivalunakukejori.pdf
    • http://tai-group.com/upload/files/dumexojoraguvukimebuxi.pdf
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c737800a7a9---lafije.pdf
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/34d9usdu1d6qj7h4g319cmf1l6/wonuzawarobopujobupevav.pdf
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/v2bdcdi1o28f573a619nt7n7sg/sogorafonere.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=what+animals+are+cold+blooded+list
    • 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_off0000e893.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE893 16792 bytes
font_01_sfnt_off000100aa.bin
a42b17e69ff1adcf280895219bc4f63bfa91b624a78941c146ee5b9341182024
pdf-font-stream PDF embedded font (sfnt) at offset 0x100AA 10768 bytes
font_02_sfnt_off00011933.bin
5b137f4e344ecf96952bd4080f4fead9e1336f5fae69748ae6235c61b2bb4af9
pdf-font-stream PDF embedded font (sfnt) at offset 0x11933 16604 bytes