Malicious PDF — malware analysis report

Static analysis result for SHA-256 aea6cbb87a7a380e…

MALICIOUS

PDF

87.3 KB Created: 2021-09-02 17:10:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 292232489d0a95d1bf736c93c4cc5c9e SHA-1: 270ad3532bf3a48e7537de3ea22355fd9e1a51e6 SHA-256: aea6cbb87a7a380e080686a9411341c23ac3651feb2408c2f1019ae2a3e60606
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to compromised WordPress upload storage, suggesting a lure to download further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with phishing and malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080faa188584---64270280611.pdf In PDF document text
    • http://eksan-ltd.com/userfiles/file/fuworixexibi.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/29881813009.pdfIn PDF document text
    • http://cukorbetegshop.hu/files/xinawotubewikudukavole.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/40525478441.pdfIn PDF document text
    • http://rld-carbon.ru/file/tijalogolewudiwepugarawu.pdfIn PDF document text
    • http://velo.hu/UserFiles/file/walexafazidupus.pdfIn PDF document text
    • http://vpsystem.com/files/fck/jojimuju.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/fupigasogibagok.pdfIn PDF document text
    • http://smartpaintingplus.com/userfiles/files/vusuwu.pdfIn PDF document text
    • https://camerabentrenet.camerabentre.vn/ckfinder/userfiles/files/vitawupalavalelupiji.pdfIn PDF document text
    • https://mimpishiodua.com/contents//files/zodazasiwibojutowenigizi.pdfIn PDF document text
    • http://chinalanpa.com/images/upload/File/delapibojokidowilokedaw.pdfIn PDF document text
    • http://selfmadefilms.nl/userfiles/files/sufobevipodakudugonuloj.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/sadokaze.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/2f67d9956abf699496c27f40904993fc/putipexup.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/db539ed871fb3897032b76299c131d60/6814324328.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/bedifutujenu.pdfIn PDF document text
    • https://bushregenerators.com/userfiles/files/89077228052.pdfIn PDF document text
    • http://losmarinoslanzarote.com/marinarubicon/admin/file/pabox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=convert+pdf+file+to+powerpoint+presentation+freePDF link annotation
    • 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_off0000f21a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF21A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A31 10672 bytes
SHA-256: b3d46177545b08080a0c0d39ace34a6477178bfcddf6c96f7ae471925621159a
font_02_sfnt_off000122de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122DE 17404 bytes
SHA-256: 571f9b8a66b341398050026b794bfddab8d66e110e11a6a23accfd4ee560fdb1