Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2120623f9bf2e54…

MALICIOUS

PDF

87.2 KB Created: 2021-06-27 23:25:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0c79361c6c70f2daee1dfdba5dcb8ff3 SHA-1: 77570c247bcfa286f1d151d3791b8c7ac63e4035 SHA-256: d2120623f9bf2e54b956a4a0e204923392fd2eb2b3c28213e2581ca0feeebd02
164 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript and a large number of external links, many pointing to compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://oniceh.ru/uplcv?utm_term=5th+class+english+chapter+1+question+answer
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afcdfb6a208---79847538208.pdf
    • http://ashioke.com/images/library/File/8492322165.pdf
    • https://moto-trend.cz/public/files/fck/file/teronodevonoxepite.pdf
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607e57ea4226d---64098390152.pdf
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/bulixipovaxexuniwo.pdf
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/2fbaaf07568bfb9ceac929ffb009c2eb/67197243007.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/73f959f5d443711a15e46fe6657ce18c/51533710643.pdf
    • https://saam.vn/images/content/file/fewimarejuluxadepateza.pdf
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/25d6d559ad1b0d8c3352d7cd75b98dc3/vajolaleze.pdf
    • https://fresh-cherries.com/ckfinder/userfiles/files/wumuvibeguzumanezi.pdf
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/71292831cbe12b3594831aa8ae075499/bovokibewukibiv.pdf
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16087714232423---kipedavas.pdf
    • http://dok-vo.ru/userfiles/file/36593410322.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/80cdf9b7cdd507063342665d2105b4ad/8797265960.pdf
    • http://aliceinformaticasrl.com/user/pages/wadulanup.pdf
    • http://www.anjhimayath.com/upload/file/2328308455.pdf
    • http://93564497.com/userfiles/3073799811.pdf
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e70d01bcb---30631688882.pdf
    • https://juhaszautovill.hu/userfiles/file/powaxebuvase.pdf
    • https://xn--fct8ml6mwue.tw/uploads/files/99331934209.pdf
    • https://planet-for-events.de/userfiles/file/lizuxeginezax.pdf
    • http://blow-w124.com/js/upload/files/rapimipubo.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efae.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAE 16792 bytes
font_01_sfnt_off000107c0.bin
f31fd1e6355db9035d97fd2cbd697c7cf6126e224b7bcde9b9981751d6ceb308
pdf-font-stream PDF embedded font (sfnt) at offset 0x107C0 17088 bytes
font_02_sfnt_off00013422.bin
3a0afa9f4176120b402d38ff6438d627f052243be9825e18bf3139ce9d18f4b5
pdf-font-stream PDF embedded font (sfnt) at offset 0x13422 11076 bytes