Malicious PDF — malware analysis report

Static analysis result for SHA-256 694e2569d3d9973a…

MALICIOUS

PDF

84.7 KB Created: 2021-08-21 09:03:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4766a692805f5b55b286ecdd4e99081b SHA-1: 640026e89e9f8ceed0b7019e4919b79e48d6db0a SHA-256: 694e2569d3d9973a83d3dff5e60eb9e22dd6b9f0ed28d9a3a8d496375db5d356
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features numerous external links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The ClamAV detection and ML classifier further confirm its malicious nature, likely serving as a lure to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://csom.cz/wp-content/plugins/super-forms/uploads/php/files/c3dc317b60be585b72370385dee0edf6/lejudan.pdf In PDF document text
    • https://amitadevnani.com/userfiles/file/47339629740.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/12864219453.pdfIn PDF document text
    • https://majubesar.com/contents//files/gapugufilekizanob.pdfIn PDF document text
    • https://hocaukhudothithanhphogiaoluu.com/asset/site/files/sobakuzumura.pdfIn PDF document text
    • https://tnmkor.com/FileData/ckfinder/files/20210812_71B185C13FE13F48.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160729fde14bf9---poxenewip.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072803a7e231---88724568191.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/76357312766.pdfIn PDF document text
    • https://jkmart.net/FCKFiles/File/35031997.pdfIn PDF document text
    • http://geodavidepini.it/userfiles/files/kedobaxiw.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/5deae480e2a9e2dbec39c0cc7466a665/kufaduvenipegexek.pdfIn PDF document text
    • https://blogsma.com/files/xirebagifopuj.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/gedimel.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/99548853543.pdfIn PDF document text
    • https://drrajanmahtani.com/userfiles/files/vuvekawidutupemebogoj.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/161131d3308bcc---17545277706.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/jamoniwugalafunejibegoz.pdfIn PDF document text
    • http://www.mediagrand.hu//data/editorfile/tefajuvago.pdfIn PDF document text
    • http://greenplanetnepal.com/userfiles/file/jixuwapuzavamikil.pdfIn PDF document text
    • http://xn--2-140-swe8h.xn--p1ai/files/kemudupamasaderabiwur.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/35bd4aa2ebb07feb74a01020f2a4e4e4/98396168962.pdfIn PDF document text
    • http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/24924966307.pdfIn PDF document text
    • https://kitapkapla.com/upload/ckfinder/files/jafesabepumalenobegubini.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=%C3%B6abt+lise+matematik+%C3%A7%C4%B1km%C4%B1%C5%9F+sorular+%C3%A7%C3%B6z%C3%BCmleriPDF 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_off0000e277.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE277 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA89 17936 bytes
SHA-256: 7e2bbe58b161f7d5d228e68ec8d2e743375f541e48900021b4b73cfb94f1da81
font_02_sfnt_off000127d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127D9 11572 bytes
SHA-256: ffd3fb9c71d1db24b4a886e1344fa0a287979fcf44005157e86856ba3abf80ff

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