Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d66da528a54c091…

MALICIOUS

PDF

81.9 KB Created: 2021-09-18 23:05:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 03da0ab97d474abbab663f8ca3a77689 SHA-1: 4970bf2b8fc5a91a78d47146b50361e3ba1c6d93 SHA-256: 2d66da528a54c091e50e34655d201f15d89a2b0b82c186ec9835cf79b6c4c409
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • 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.
  • 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://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/cdfcadba9b40d038c57b3751964e0b6e/nufilupuzozifiruluguvira.pdf
    • http://abwrichmond.com/uploads/files/14520093793.pdf
    • http://queensparkview.com/image/upload/File/lisibufisa.pdf
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/75034542573.pdf
    • http://sklenicky-obchod.cz/web/admin/fckeditor/userfiles/file/99761638386.pdf
    • http://benthanhsgfarm.net/images/uploads/files/80788995205.pdf
    • http://mikailang.net/userfiles/file/20210909171207_58249223.pdf
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143bac5dd484---459797729.pdf
    • http://quatanggiabao.com/images/uploads/files/60297267131.pdf
    • http://thietbiantoanttk.com/uploads/files/kotilaxuxesap.pdf
    • https://noursportevents.com/wheelmarine/userfiles/file/zaxogizawibadurejavexo.pdf
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/161320b9b7046f---33468423421.pdf
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137d13fe6c4e---xubid.pdf
    • https://sreekanakananda.com/ckfinder/userfiles/files/30171484392.pdf
    • http://adamlegal.com/userfiles/file/94771360115.pdf
    • https://tsydesign.com/userfiles/jws/files/66198795917.pdf
    • http://ros-audit.com/i/up/file/jomuxobesi.pdf
    • http://phayaotechno.com/UserFiles/File/78015607876.pdf
    • http://staresecurity.com/userfiles/file/wazidubufimuwebutuleva.pdf
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/6cf3e15030c58c89be425aa464eb0eb7/40582504880.pdf
    • https://bongkartuantakur.com/contents/files/vizikelanidobapuxuron.pdf
    • https://gkia.org/kingkong/userfiles/files/63195139005.pdf
    • http://coverybox.box8websites.com/ckfinder/userfiles/files/55800090020.pdf
    • http://favourtec.com/attachment/file/17012395225.pdf
    • https://elger.cz/fckphotos/file/sazutibilijabufetujusu.pdf
    • http://xn--90aoa5aj.xn--p1ai/ckfinder/userfiles/files/baganefi.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+reset+moto+g5+plus+without+losing+data
    • 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_off0000d8dd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD8DD 16792 bytes
font_01_sfnt_off0000f0ef.bin
fc71456ac02de10a159425a698aec71ece43a9332df00d8f65dae9b9f1e2f7ca
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0EF 18188 bytes
font_02_sfnt_off00011fee.bin
7405c635bd47efedc6f4e4661c788efafc70d25a8af418aebca3e6519941f1ae
pdf-font-stream PDF embedded font (sfnt) at offset 0x11FEE 11152 bytes