Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6fe38dd3305d3cc…

MALICIOUS

PDF

74.8 KB Created: 2021-09-03 14:50:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d7cd47a10e6f9d4d7b92bcdbf54ed33b SHA-1: 38cc57438dd31bddf9f9900cc28cba9e3c26f301 SHA-256: e6fe38dd3305d3ccd023dc5745896b8a681a7fc10645284fcc13b0a125656607
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites using the formcraft plugin. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing or a trojan. The presence of embedded URLs and the structure of the PDF suggest it is used to redirect users to potentially malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://medvor.ru/uplcv?utm_term=rotary+lift+mch18+manual PDF link annotation
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f727cba16---58877328707.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161288790967dc---38517484166.pdfIn PDF document text
    • http://fygl.net/uploads/file/090853192539.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d67b1d6e2a3---58293335045.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cefcd23199---mesapu.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4d33b71dc7---pojepurowo.pdfIn PDF document text
    • https://walnutcreekguide.com/wysiwygfiles/file/piwumawoxemedez.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac43fd75e99---77689971512.pdfIn PDF document text
    • https://legouic-peinture.fr/userfiles/file/36919746389.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e029edae52---tisijav.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/28omga8jcestu1hgroj626e4e4/61501229133.pdfIn PDF document text
    • http://haustechnik-hagenauer.at/52326704949.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/16106797c96727---nifujoru.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/9a8c3626ed44d268fa0c27810e886a8c/3803205520.pdfIn PDF document text
    • https://copab.tn/216mag.svn/uploads/files/damajizifabosidugoxoxo.pdfIn PDF document text
    • http://csc020.com/userfiles/file/20210619181006_tc2vmj.pdfIn PDF document text
    • http://maybomnuocdanang.com/uploads/image/files/30192206422.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/u1iu26j7jc072vo5m079thofb8/21222343347.pdfIn PDF document text
    • https://ropaalmayoreo.com/images/userfiles/file/vazuvoxevebeso.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/pebafepedoxepakuv.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abf17b15d33---84757870036.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_off0000bfd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d7e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E7 10820 bytes
SHA-256: 3b12961d34046d5e9d023e8d8ac6c8b052712f7fc6d8c0350bc29491b135d095
font_02_sfnt_off0000f0c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C2 17532 bytes
SHA-256: 0277bf9c745116a6652f38bad8524bf9d2f51011a3c5b5645e23c06c0a5d2196

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