Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6eebadba5db139a…

MALICIOUS

PDF

80.8 KB Created: 2021-09-04 18:13:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 171e0cc3a8b1bba4b75bd263ebf328f4 SHA-1: e021c4d07dfcd8d179a513ae462e553f7cd8ba27 SHA-256: a6eebadba5db139a83f5f9e395fd56b2acd71d0eec4d4efe57056cf513aed256
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier with high confidence. Heuristics indicate it functions as a link farm, pointing to multiple potentially compromised websites and disposable hosting. The document body is heavily obfuscated, preventing a clear understanding of its direct user-facing content, but the presence of numerous external links suggests a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://casabresciani.it/uploads/file/wurosukimuwurolovak.pdf In PDF document text
    • https://destockbaby.com/ckfinder/userfiles/files/68563315591.pdfIn PDF document text
    • http://chuaphucluong.com/uploads/image/files/fonowurizijeg.pdfIn PDF document text
    • http://erfaspot.com/resimler/files/13276398670.pdfIn PDF document text
    • http://eurekaelearning.com/upload/news/file/kiditilo.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/708b786eb9a5a375b0e77322a8eb3b00/rafed.pdfIn PDF document text
    • http://sungsam.net/userData/board/file/sapuvidagowuzes.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/77040870918.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160921294a4e85---tebipakiluwedebufame.pdfIn PDF document text
    • https://www.premiumtrade.ro/ckfinder/userfiles/files/kesalazutorakebep.pdfIn PDF document text
    • https://www.seblocation.com/ckfinder/userfiles/files/90291871834.pdfIn PDF document text
    • http://porpora.biz/imagenes/imagenes_contenidos///kixozexuzogibop.pdfIn PDF document text
    • http://qbcar.ru/ckfinder/userfiles/files/wifipewi.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/14465190820.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/16089a010e0213---wefavokepivagozenora.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608dd673546c2---vogunepepoxub.pdfIn PDF document text
    • https://razredna-nastava.net/files/fudaxirubajidikobelawulir.pdfIn PDF document text
    • http://daycamhoa.net/upload/UploadFiles/files/7048055663.pdfIn PDF document text
    • https://www.frontieregypt.com/sites/all/libraries/ckfinder/userfiles/files/43327423287.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/fapase.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c50b9651979---dokikasuxenezivesewevudo.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/5qh9duu88on5t9don45en4uobo/24818549158.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/gebofal.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/zukemesifodupeso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=klasifikasi+dan+morfologi+ikan+lele+pdfPDF 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_off0000db5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB5A 15972 bytes
SHA-256: 127f14832ae0a22343516f59ed73a644de54a5266ac6e5a0261d1280105f7d82
font_01_sfnt_off000104e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011cfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CFE 10824 bytes
SHA-256: 9ba1c6c860dd12920de9638f822e1efe31f431935709883fc5b417d644ce1478

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