Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0c5d38ec605d03c…

MALICIOUS

PDF

84.0 KB Created: 2021-09-07 08:52:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 40d3c9e9822807a237d7fb9a447a3ace SHA-1: bc9ae4dad5835f36b45c622f0d0fb78b5626d653 SHA-256: e0c5d38ec605d03c808bb2821eee560fc303e755f88da7cd30bcbcc546088998
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links pointing to various websites, many of which are hosted on compromised or disposable domains. This behavior is characteristic of a link farm used to distribute phishing content or malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a86882b69db---83617482964.pdf In PDF document text
    • http://domingo.hu/ckfinder/userfiles/files/welejamopivafowidipap.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6a97ac2f0---lapazevofiko.pdfIn PDF document text
    • https://maxflowfans.com/userfiles/file/38299789035.pdfIn PDF document text
    • https://dolmalatrek.com/userfiles/file/81968216668.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/cbd914f5bf0949e6897a9a5621936a02/7985580584.pdfIn PDF document text
    • http://22vek-omsk.ru/fck_editor_files/files/7325138818.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608988b55a36b---nofevemibomu.pdfIn PDF document text
    • http://praguetransfer.com/files/file/bisuwilopasopabex.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/xesoropopar.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/gdba8ppnl07pt824dgs4ceh10r/novivonumusav.pdfIn PDF document text
    • http://startmatbaa.com/userfiles/file/devijakolusenukevu.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/wenubu.pdfIn PDF document text
    • http://jualumnitoronto.com/editor/uploadfiles/78021818489.pdfIn PDF document text
    • https://dhesient.com/media/41243897335.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/4f69661d66397563406d66ffb87a74bd/46415637451.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/eb265650b3690680ae158fdd75859fef/69059236104.pdfIn PDF document text
    • https://thietbivesinhsonhoa.com/webroot/img/files/16031966273.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/9907cdcd7589c9bcd990f42c845ef50b/ponejukadiz.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/205075a58ee98ce74d8f8905ef31044e/4915081474.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/fusubudekadajul.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/jetib.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085f7c544202---bidezegi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=animator%27s+survival+kit+pdf+onlinePDF link annotation
    • 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_off0000dfdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7EE 18876 bytes
SHA-256: 768b517e306dcfe80c1c4faf441661d10ed2d556f3efd9e0039a5f06687d6d1c
font_02_sfnt_off00012903.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12903 10932 bytes
SHA-256: c20cde368e3500fe92a9600b7a876fa28657260925b7548db8c5c4a7f02ae45c