Malicious PDF — malware analysis report

Static analysis result for SHA-256 edde72c4a0f1fd8e…

MALICIOUS

PDF

83.8 KB Created: 2021-09-10 06:14:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 26380967d42159d6b86948fb7e65bf39 SHA-1: 0d87762bb2c10e3e0c6ace0d52ba265bd514baa0 SHA-256: edde72c4a0f1fd8ee5a82d237daffebce8c5c8e97c6a059d5b90f3ba11163ad2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a phishing or scam attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the nature of the link farm and the presence of external URLs suggest potential redirection to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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 http://gpmpoolandspa.com/ckfinder/userfiles/files/76624539856.pdf In PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/8127050139.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16131abf71be65---44859533405.pdfIn PDF document text
    • https://rh-h1tapi-turbo.com/contents/files/jevoxasopepulatofozora.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/kapopunulodagokuna.pdfIn PDF document text
    • https://kopari.hu/files/file/5524856489.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/usck371hrgdjh4t1c7o44ila64/31165832238.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/43556367554.pdfIn PDF document text
    • https://sokolzgierz.pl/web/uploads/files/dizevawokulefiputo.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137633c26ab5---zawozogazezusagozubamego.pdfIn PDF document text
    • http://peterpan1996.it/userfiles/files/15391323022.pdfIn PDF document text
    • https://www.greenlakecruises.com/ckfinder/userfiles/files/dijoxini.pdfIn PDF document text
    • https://dubaimotorcycletours.com/uploaded_images/files/baletumuxogozarazunalexo.pdfIn PDF document text
    • http://veoguidecostarica.com/ci/userfiles/files/94569366270.pdfIn PDF document text
    • http://www.waetsukai.jp/system/ckfinder/userfiles/files/mimewutu.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16135a604241d4---kerivanon.pdfIn PDF document text
    • https://holcom-solar.com/webroot/img/files/zalefodezo.pdfIn PDF document text
    • http://yuha.be/_files/file/luvole.pdfIn PDF document text
    • https://nieruchomosciturystyczne.eu/files/file/gekaxukutetuj.pdfIn PDF document text
    • https://gea99.com/ckfinder/userfiles/files/83809286319.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/vejid.pdfIn PDF document text
    • http://mp-journal.com/media/file/65550640216.pdfIn PDF document text
    • https://questyme.com/userfiles/file/26470575108.pdfIn PDF document text
    • https://greenlandpark.com/uploads/files/jazifokoporal.pdfIn PDF document text
    • https://tongdaidoanhnghiep.com/app/webroot/upload/files/7064607425.pdfIn PDF document text
    • http://18554080.com/userfiles/file/jojomopusobopom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=aos+tv+alternativePDF 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_off0000e5d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fdec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDEC 10148 bytes
SHA-256: 9b0a091d87da3089b99948c1bc478e8cb47d6ce8414a842aa4825175f3d062ae
font_02_sfnt_off000114c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114C6 17336 bytes
SHA-256: d4671c39080932304b6313cd9e77a5d47660d32c2c6bb0a60d9d2830ca997e14