Malicious PDF — malware analysis report

Static analysis result for SHA-256 e27725e13722cf0b…

MALICIOUS

PDF

72.8 KB Created: 2021-09-24 21:33:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b5ba92bd951aceca25c7cd4b260692bc SHA-1: a3a0216b04a921a8678c85ac08e530787b2ae968 SHA-256: e27725e13722cf0b77ba3d3b6a75522c53216dce8e5132e63ee608b484b4b09f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable hosting, suggesting it's a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://wastran.ru/uplcv?utm_term=indian+idol+2018+grand+finale PDF link annotation
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149416f9a273---34520717400.pdfIn PDF document text
    • https://mbzl-pro.xyz/web/img/podborky/files/37250314395.pdfIn PDF document text
    • http://lexprikson.com/admin/style/images/userfiles/file/jexulojebutiwekinajipole.pdfIn PDF document text
    • https://kisikana.hr/UserFiles/files/3693245272.pdfIn PDF document text
    • https://marblobath.com/app/webroot/img/files/lozosexabuma.pdfIn PDF document text
    • https://global-product.org/CKEdit/upload/files/raruwalanavam.pdfIn PDF document text
    • http://wignaccent.com/FCKeditor_2.6.3/userimages/file/20210913210300.pdfIn PDF document text
    • https://greenvalleykerala.com/ckfinder/userfiles/files/82361339528.pdfIn PDF document text
    • http://sqc.jp/user_data/editor/ckfinder/core/connector/php/upload/files/sufegawejetidakuk.pdfIn PDF document text
    • http://archi1919.com/smlclub-files/file/lasegedawod.pdfIn PDF document text
    • http://club-integra.ru/userfiles/file/98949074089.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bea1c95854---95897894351.pdfIn PDF document text
    • http://mlight.cz/archiv/file/kafobef.pdfIn PDF document text
    • http://aotwresort.info/ckfinder/userfiles/files/14355347397.pdfIn PDF document text
    • http://galantemontagnana.it/ckfinder/userfiles/files/7589655380.pdfIn PDF document text
    • https://mtmnetwork.net/uploadEditor/files/78016173362.pdfIn PDF document text
    • http://universalgroupautos.com/files/others/40427128468.pdfIn PDF document text
    • http://leeharringtonhomes.com/userfiles/file/57044460817.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613df68d6a1ee---38769641339.pdfIn PDF document text
    • http://kjphotocon.org/data/userfiles/files/16249398248.pdfIn PDF document text
    • http://gshosnab.ru/userfiles/file/6940899002.pdfIn PDF document text
    • http://adatarimhayvancilik.com/Images/Media/files/xarasatusajojemojixefuf.pdfIn PDF document text
    • http://schokofontaenen.de/idata/99865576336.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/lisilapuwurikafa.pdfIn PDF document text
    • https://giolog.biz/images/bulk_images/files/95417985057.pdfIn PDF document text
    • 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_off0000b872.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB872 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d084.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD084 17228 bytes
SHA-256: cf97cc35bdfacf96c8cc35bed4e635970ee862f8b2143287a9c4a1bdf7b00828
font_02_sfnt_off0000fcb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB3 10716 bytes
SHA-256: 7e3e9389dba99e3dfb63159b95df3a2505c8fb4ea5fe6c75267aa594e2b4d5c7