Malicious PDF — malware analysis report

Static analysis result for SHA-256 63afda280b956c73…

MALICIOUS

PDF

71.7 KB Created: 2021-09-17 19:44:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4e75cb795256182c31b91aefd36443bf SHA-1: 0efc6e7f62bd1b3ab42616809a77d71524aad9f5 SHA-256: 63afda280b956c7341a2bbfba253d56519f0abb28972b8e91894dc2fdf2db503
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to potentially harmful sites. The presence of external URIs and link farm heuristics strongly supports a phishing or SEO poisoning attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://thienthaopc.com/upload/FCK/file/89352872211.pdf In PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613d86152e3d8---69827420904.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/janoliwo.pdfIn PDF document text
    • http://sherwoodonionfestival.com/ckfinder/userfiles/files/61563319618.pdfIn PDF document text
    • http://hkxhjfc.ltd/uploads/files/20210914175747.pdfIn PDF document text
    • http://wangyiphk.com/userfiles/koxebuluw.pdfIn PDF document text
    • http://anbao.vn/uploads/userfiles/file/54696489657.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613c6ac21904e---nisulor.pdfIn PDF document text
    • https://bazk.info/public_htmluploads/file/48900897731.pdfIn PDF document text
    • http://svazekobciorlice.cz/userfiles/file/nusojoluvovuvewudasi.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/nivowewasagifaravo.pdfIn PDF document text
    • https://pmeds.us/userfiles/file/notuvigameb.pdfIn PDF document text
    • http://mislenyiallatorvos.hu/userfiles/file/metude.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161378c383a484---jovorerozerikopigosoliza.pdfIn PDF document text
    • http://only-svet.ru/upload/files/68741271056.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/98002047186.pdfIn PDF document text
    • http://astorandblack.net/emailer/userfiles/file/dokulaxugofetedojivi.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/35455460944.pdfIn PDF document text
    • https://mayphotocopydogia.com/upload/files/89587712946.pdfIn PDF document text
    • https://egokituz.org/files/galeria/files/1982519859.pdfIn PDF document text
    • http://partnerplus30.ru/images/fornews/files/jopoze.pdfIn PDF document text
    • https://ikuseikyokai.jp/ckmedia/files/72846599131.pdfIn PDF document text
    • https://iwanbim.iwan.co/userfiles/files/87678990406.pdfIn PDF document text
    • https://istanajpdua.com/contents/files/38382621755.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=control+android+tv+remotelyPDF 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_off0000b8b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8B2 15996 bytes
SHA-256: e73b7e5c95aac493bc8a2a729a7d86085d7343096aac41298fc220069bd1b9cb
font_01_sfnt_off0000e1d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f9e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E8 10452 bytes
SHA-256: 4fbc7a2ad91cbffb78f247ef2f673a92a1df19a82372ccd9f7047c6520354ad1