Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf803bfa5f7419be…

MALICIOUS

PDF

80.3 KB Created: 2021-09-19 09:25:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ad087dff0656ce9e72dbd62c75443513 SHA-1: 0fa23dcb702d4eb2332c9e4010a35a8041f182f7 SHA-256: bf803bfa5f7419bece07a9299ca72b381f94bc985871ad1af5880af160db7142
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded URLs that act as a link farm, directing users to other PDF files hosted on various websites. Several of these URLs point to compromised CMS upload directories, suggesting an attempt to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://messianic.live/wp-content/plugins/super-forms/uploads/php/files/22418c2a453bfbc352049b2e01175dfc/leteza.pdf In PDF document text
    • https://actaviaserica.org/board/file/files/64794814607.pdfIn PDF document text
    • https://uleshuzatabc.hu/files/file/xejinoradodukada.pdfIn PDF document text
    • http://rentbucharest.net/images/userfiles/22185096180.pdfIn PDF document text
    • https://viktorina.ledoritulys.lt/files/33123358826.pdfIn PDF document text
    • http://jeanthompson.nl/ckfinder/userfiles/files/42418796921.pdfIn PDF document text
    • https://tonere.shop/app/webroot/files/userfiles/files/58037773048.pdfIn PDF document text
    • https://rajaunited.com/contents/files/masusufibube.pdfIn PDF document text
    • http://nitecoreromania.ro/files/file/69643991719.pdfIn PDF document text
    • http://akifkasaboglu.com/esatfisek/images_upload/files/nuwokekiwek.pdfIn PDF document text
    • https://binhvi.com/upload/files/42486769083.pdfIn PDF document text
    • http://www.weilandensemble.nl/ckfinder/userfiles/files/3822948981.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613f95d7041b0---zetekekomawafamemagadiwig.pdfIn PDF document text
    • http://sangtaoad.com/uploads/userfiles/file/difugugepis.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/novuru.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16130e8737224b---83885286400.pdfIn PDF document text
    • http://cnsgafgl.netsociality.com/upload/files/kuwexufulepofirori.pdfIn PDF document text
    • https://balticstroy.com/uploads/files/midizi.pdfIn PDF document text
    • https://korzo-galeria.hu/files/file/wedebekunurosotetuxupepan.pdfIn PDF document text
    • http://refinerlink.com/userfiles/file/jawuwelawofe.pdfIn PDF document text
    • http://uptownfallschurch.com/uploads/files/merogepakida.pdfIn PDF document text
    • http://cayxaotamphan.net/userfiles/image/file/58486242069.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=mobdro+live+tv+iptv+hd+player+androidPDF 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_off0000d51d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD51D 10632 bytes
SHA-256: 4d1dd95b67464148699f0fb8c8927ed39bc7a15487ba07516df4baa6c4338d5b
font_01_sfnt_off0000ed20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED20 17768 bytes
SHA-256: 272f45127f2828f1fec91fe0eff4e691401780fcf1462e89686333644b0133f4
font_02_sfnt_off00011bcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BCD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1