Malicious PDF — malware analysis report

Static analysis result for SHA-256 8766c2fc27f29b21…

MALICIOUS

PDF

81.9 KB Created: 2021-09-06 09:08:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f7d009cb73ab2395ca5f5b3edab06455 SHA-1: 993e2078fa521b69a1b4d4306e0640107c600540 SHA-256: 8766c2fc27f29b21dd35195b9db76e181d9ec5a199ec1094032b9b731102897a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or delivering malicious content. The numerous URLs, many pointing to compromised CMS upload directories, suggest a link farm designed to redirect users to malicious sites. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=post+harvest+of+banana+pdf PDF link annotation
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607eae223370d---86016550249.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dec54ceda3---temofirexabe.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080eddb352fe.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/44500161652.pdfIn PDF document text
    • https://eastmanllc.com/ckfinder/userfiles/files/mokurewaj.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160ba75858fed5---26582363007.pdfIn PDF document text
    • http://ap116.ru/userfiles/file/kelav.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/82770373fbb0f6ebb2ffa6262688bf28/wijukizud.pdfIn PDF document text
    • http://phuongdonggolf.vn/app/webroot/uploads/files/giwimakowelaketoroxova.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/4b66207a90e0186ad7f9b4c71141de06/34884820988.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/j9g68i4otfssdk9bq79n0eh15e/fodetudipenunajenu.pdfIn PDF document text
    • https://www.ideaklinikbursa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae75f2dfce---81121024708.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16130e43882e9d---lesejigosumotidedek.pdfIn PDF document text
    • https://newchat.xyz/js/ckfinder/userfiles/files/80036872735.pdfIn PDF document text
    • https://tomas-music.com/contents//files/14869390569.pdfIn PDF document text
    • https://asiajitu.com/contents//files/wavoderubikisigokuxogilew.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/niv6fst59nmed5ln75sn43jp10/91450587264.pdfIn PDF document text
    • http://dptour.net/bot/ckfinder/uf/files/5017851399.pdfIn PDF document text
    • https://presstone.hu/userfiles/file/kafalemixelexinaluriwiwun.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081c60e6647d---52241621620.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/fetadagekavowosop.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/f0ee596b4f4cd6a22fa0b60c4c363211/37371175451.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_off0000dbbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D3 10664 bytes
SHA-256: b6174e8082b4d60c4f1eaf0c065c5f3cdca22d3645fe2526f02bf108ea6498a5
font_02_sfnt_off00010c06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C06 17896 bytes
SHA-256: 1ff1dd420e9423d23b9c06151083170989daec996dae2019a9743b7b2501d2a8

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