Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc65a3cf80f9b4f0…

MALICIOUS

PDF

77.9 KB Created: 2021-09-28 21:20:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2837ea1a0cf3ba67cd3ec6cf1728a2d6 SHA-1: 96c85eb4eb5bc59890eb9311eb15f7470d3a08eb SHA-256: dc65a3cf80f9b4f052dce8100d7dd77a8d935e0127306a93e84546053e955b9f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external URIs and is flagged as a link farm, indicating a phishing or redirection attempt. ClamAV detection and ML classification strongly suggest malicious intent, likely to lure users to compromised websites or download further malware. The presence of multiple compromised CMS upload links further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://chcial.ru/uplcv?utm_term=wifi+unlock+for+android PDF link annotation
    • https://beaszemin.com/files/61728232828.pdfIn PDF document text
    • http://gonzagafood.com/userfiles/files/84632466273.pdfIn PDF document text
    • https://www.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/dazazasi.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16136e71f5b2cb---44375317928.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/7cc7ef073fd8f8343198b4e3e54406c8/pibixe.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/5690d09f5cffbf6143229b8049e789d1/83530613115.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/f5e6f4a287f39edacdd43056620ce452/fifenexe.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/14966623196.pdfIn PDF document text
    • https://techielingo.com/fck_uploads/files/76365927857.pdfIn PDF document text
    • http://xn--rssx31a7tec6p.com/upload/userfiles/files/20210902011432.pdfIn PDF document text
    • http://tverzhilservis.ru/foktver.ru/ckfinder/userfiles/files/97322718124.pdfIn PDF document text
    • http://debnine.net/UserFiles/File/puvefuzu.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/v5suc3pcbnadkulu8jlu3cm74l/68359313999.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613be5e3f2905---wevoropo.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/18971380287.pdfIn PDF document text
    • http://liveisagenix.com/ckfinder/userfiles/files/lebutijafubonoluseruj.pdfIn PDF document text
    • http://zezoalza.com/ckupload/files/12743847826.pdfIn PDF document text
    • https://lawweb.info/mycms/admin/userfiles/file/nixexuxaloxo.pdfIn PDF document text
    • http://nbc.ua/design/pic/file/ronexetobuvofulal.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/38862339060.pdfIn PDF document text
    • https://drakbera.com/ckeditor/ckfinder/userfiles/files/88958224279.pdfIn PDF document text
    • http://kamennykoberec.eu/editor_uploads/system/files/6594643693.pdfIn PDF document text
    • http://seyrimerdin.com/userfiles/file/40230134665.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_off0000c771.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC771 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF83 20476 bytes
SHA-256: a6aac22564a0a5441db34f805700da49043122bb430ebd7ff8c263d361750c42
font_02_sfnt_off000113a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113A6 10256 bytes
SHA-256: ca46eecc818e3bafe5d15fabda96a3b23b14ec593f121eb7ad2e0b1eea8c6045

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