Malicious PDF — malware analysis report

Static analysis result for SHA-256 a40c041fd9fe3a3a…

MALICIOUS

PDF

91.9 KB Created: 2021-06-28 04:06:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 8deec8a346f6bf365a7169b73297f0b8 SHA-1: da0142ac511f6744868571ae083898269387f794 SHA-256: a40c041fd9fe3a3acfd66851decb2fa40b85aaa490781c39c0af273b1bd9e4a8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the PDF structure strongly indicate it's designed to redirect users to malicious content.

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://pixomot.ru/uplcv?utm_term=delete+all+data+from+table+in+sql PDF link annotation
    • https://songhong.info/userfiles/file/46467742328.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac2c3267c2---lukopevijibazidegoxitez.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/ddpjl3v60c7pf9nj783to7o9uv/63792700712.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-5-27/20210527205404291019.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/ad70a0024e39be8bd989b32676d24c8f/10121544845.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083e0c40857a---86420970756.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/12hg4s42bojph8412hn042ugi2/80529138933.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160732bc6be202---mupizuke.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ae5ecfcee59---1186518480.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1606fbd726ae1b---lizumonexabudub.pdfIn PDF document text
    • http://cn-polylysine.com/d/files/74642471570.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160b652bf38ee7---zokedajino.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/0e832121ff2b8146bf3aec76833c7126/muwilaminebojuxafisokim.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/0b754946a586f004eac92e0c1373b069/vojovelerafel.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/67269018291.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/7c5c907c4f34364464b0c31afba38410/26884767767.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/ca2a9ff6a085b900178c6fd7d79b1fcc/46757439470.pdfIn PDF document text
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/mujtfjhn29c9uvs7mrq1hjsp02/22823395122.pdfIn PDF document text
    • http://shsalumniauditorium.org/clients/f/fa/fa32e32112b7cad64a7d7e78b95ed61b/File/galur.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f656b7008a---43012700340.pdfIn PDF document text
    • https://pablohernandes.com/wp-content/plugins/super-forms/uploads/php/files/5ee2a987702cde955d1a0681d0dfe12b/xejuzilirawated.pdfIn PDF document text
    • http://0930actress.com/files/files/60402786478.pdfIn PDF document text
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/k67si85sv90ktqahj6cr6dg3k1/10662133480.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160d2b1a554588---11151747548.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_off000102c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011adc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ADC 10800 bytes
SHA-256: 3d35fa9a0a873f64afc0f9d0049b85d2b8f28d7ec6e4be473777ab384c59709a
font_02_sfnt_off00013378.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13378 17672 bytes
SHA-256: 3158435c9bcd6a0839370f4f744db6800f0b5b204bf580aec2f219a0d416cf1b

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