Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fcd9ba21837468e…

MALICIOUS

PDF

86.4 KB Created: 2021-07-06 18:50:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c7cd24ac21c0166885932b69f573560e SHA-1: f97f8d9796089c725bc969afc7860c457bf0fc92 SHA-256: 9fcd9ba21837468e94cd9ccb20fdd28d65d10b16d9c643eb6df61bd92c77abe2
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress sites using the Formcraft plugin. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classification strongly indicated maliciousness. The primary function appears to be directing users to potentially malicious content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • 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.
  • 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://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160818a495d1a7---xutilufi.pdf
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/045c148339149d754d6b051feec85f62/sitapuwedemi.pdf
    • http://reicar.dk/userfiles/file/42969218404.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160813d1fa56af.pdf
    • http://timnhanhonline.vn/upload/files/11238133831.pdf
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608687f9f06e1---57876444136.pdf
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160cffceb65138---gofob.pdf
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2f7b1f14f---64699798222.pdf
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3131869646---8147888203.pdf
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6486dcb6d1---25179559029.pdf
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b755b8186fb---51154385895.pdf
    • http://tdfinalists.ca/clients/43449/File/68835919840.pdf
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e7b19a1942c3de63cd09b6a94b978e40/91058548948.pdf
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/02aad315972d14114c88b12f4d57d149/watozopalesivutowo.pdf
    • http://pechati-piter.ru/userfiles/file/sifexe.pdf
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a537f5dc74f---96777256914.pdf
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/f7fdtia8mp7als826m6vb1djd9/bisitetumivogevuraro.pdf
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/4batsnoa528fkv4soesaaqoa3s/9622719977.pdf
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/50ec4b2b79034d8c536ac2b03adb2cdd/75641682540.pdf
    • http://cheers-gifts.com/userfiles/jibigusewokifezuri.pdf
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d7b54d35334---mimopejakop.pdf
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609317cd6b7e4---fowufarosupusokogi.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=heart+touching+positive+quotes
    • 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_off0000ee5e.bin
eaef7b742514a67a46a0bd234d7a5be12b5595b3286110e3ca11c44884674629
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE5E 10912 bytes
font_01_sfnt_off00010741.bin
d6dccedd159116f0f986b0fe96c81d76cbc99521cb554e86a2eb73ff56d6b4c6
pdf-font-stream PDF embedded font (sfnt) at offset 0x10741 17444 bytes
font_02_sfnt_off00013471.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13471 16792 bytes