Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a3e16e312634dbd…

MALICIOUS

PDF

73.4 KB Created: 2021-09-12 13:48:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7aa25e129b4d218ad1b3e361ad1d6148 SHA-1: 7ac3f7ac29d791598af81d48549332072337ea10 SHA-256: 8a3e16e312634dbd8be496e2212c6384718c303fdb10cd14a3c2cd53ae5c55af
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites. The heuristics indicate the PDF acts as a link farm, pointing to numerous external URLs, some hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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://iwilldoit.ru/uploads/files/files/bujapukomuzijolujupafides.pdf
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/16138c1ca119d4---nifowow.pdf
    • http://seamacros.com/upload/file/jilapitezi.pdf
    • https://autohausnschmidt.de/userfiles/file/84182513722.pdf
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae6ae4ea61---bopenosisixukijumugadof.pdf
    • http://thegioidahoacuong.com/uploads/image/files/29116559820.pdf
    • http://skoleniridicu-online.eu/ckfinder/userfiles/files/kejuregitaruno.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161349dcaa3b10---15331224770.pdf
    • http://sdhmladavozice.cz/userfiles/file/78989424832.pdf
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131424e39bb7---66029826800.pdf
    • http://finadev-groupe.com/userfiles/file/mewunafad.pdf
    • http://pdww.ru/ckfinder/userfiles/files/31394970114.pdf
    • http://xn--elementy-zczne-kwb98g.pl/media/file/35292712443.pdf
    • https://ln80.cn/filespath/files/20210902151235.pdf
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/sugimoxasekik.pdf
    • http://ytovietnam.net/ckfinder/userfiles/files/mamuz.pdf
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/161328733baea4---73461080451.pdf
    • https://rajnnuhiddje.se/userfiles/file/ziwixejawaramipewibolaxo.pdf
    • http://geredekombiservisi.com/userfiles/file/41283238298.pdf
    • http://fcraregistration.com/UploadedData/file/90423072032.pdf
    • http://air-separation-supplier.com/d/files/42907987419.pdf
    • http://pinzimoniofiumicino.eu/userfiles/files/giwisor.pdf
    • http://saveursetsavoirs.fr/image/file/64808438575.pdf
    • http://spodne-pradlo-2bpoint.sk/UserFiles/File/mafenanurijo.pdf
    • https://chatsystem.site/js/ckfinder/userfiles/files/57069422746.pdf
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138ebc07cd31---55937348179.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=free+fire+new+version+mod+apk+unlimited+diamonds+and+coins
    • 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_off0000bc7e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBC7E 16792 bytes
font_01_sfnt_off0000d490.bin
5bda049215601770eb37a0cc1c11d7991e6e57fc19bb9fc38ea308d710e449f3
pdf-font-stream PDF embedded font (sfnt) at offset 0xD490 15848 bytes
font_02_sfnt_off0000fcd9.bin
f79224aef5761633e27c8edf77865bfa7d21a90e55c235db3ea52b5722f70bd1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD9 11100 bytes