Malicious PDF — malware analysis report

Static analysis result for SHA-256 0787fa6f3a241367…

MALICIOUS

PDF

76.1 KB Created: 2021-08-16 03:27:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f7dc7451f694ecc0886dc57965cc9ae3 SHA-1: 6d27c774bdbb7b6c03171df29f776f39fd96d4c1 SHA-256: 0787fa6f3a24136783f64d3326b2e5553d66741f798e6b1629565e0b92e71a32
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and flagged by an ML classifier. It contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The embedded JavaScript likely facilitates the redirection or further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://clarkstownhs64.com/clients/2/25/255c49a504cbad61718694d8b78dfcdd/File/vepipobu.pdf
    • https://eletmodguru.hu/files/files/kinexevujilozitorovuxum.pdf
    • https://europawindow.com/app/webroot/img/main_content/files/sosodokubifanulo.pdf
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fe2b8d5883---36800346208.pdf
    • https://postelezmasivu-zlin.cz/ckfinder/userfiles/files/remisatugexip.pdf
    • http://lev-steklo.ru/userfiles/file/nalenafado.pdf
    • https://schmitz.cz/res/file/mojojame.pdf
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c21c995f33f---nobumepikoxumejemasa.pdf
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/ac7cd5d4f9774cb7892be7061ee0eb38/fegibonomorafuxufuxof.pdf
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16092c8337b778---lipasubibadoju.pdf
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/e450a3e5630c619a82875be8b598595e/93134184245.pdf
    • http://uptownchantilly.com/uploads/files/25251842412.pdf
    • http://fautographie.org/images/userfiles/files/34136051825.pdf
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160a8205c1bf49---misalavajog.pdf
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/e922cec04f7f410f3e2e14b7efd88e98/9566761908.pdf
    • http://charontrade.hu/data/file/46932953784.pdf
    • http://kientrucnhacuagio.com/upload/files/zegot.pdf
    • https://soyana.de/js/ckfinder/userfiles/files/82252205537.pdf
    • https://keluargamimpi2.com/contents//files/fidabu.pdf
    • https://xn--fiqa735be48e.com/upload/files/repowodur.pdf
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16117f5acde215---64801668105.pdf
    • http://shop-cartuning.pl/userfiles/file/nopafukunot.pdf
    • https://szekszardportal.hu/userfiles/file/64798963477.pdf
    • http://garage-fuji.jp/js/upload/files/44187175099.pdf
    • http://archinfo.ru/uploads/file/37103853633.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=motorola+m1225+programming+cable+pinout
    • 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_off0000c5ba.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC5BA 16792 bytes
font_01_sfnt_off0000ddcc.bin
065a923fd29ed6f9cd9fe079992b5e516f606f7fa94652837dbba128b85f26f5
pdf-font-stream PDF embedded font (sfnt) at offset 0xDDCC 16556 bytes
font_02_sfnt_off000108c7.bin
33746684b22aed3ce164008bc44b51bd287eb2f6bb966e1b88db9b58b94c80cb
pdf-font-stream PDF embedded font (sfnt) at offset 0x108C7 11088 bytes