Malicious PDF — malware analysis report

Static analysis result for SHA-256 d87e25854b7b0ca9…

MALICIOUS

PDF

80.9 KB Created: 2021-09-09 10:56:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4cbc1d6e44897adf46fb94adbf2e5b01 SHA-1: 651623c4010b7b044c4182c98396a940f4f5fcf6 SHA-256: d87e25854b7b0ca9529ea3ac8b48b5d973a9cfd741310f963697573e3b0e0f69
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous websites, many of which are hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://cafegreenwichvillage.com/uploads/files/bejutozisodifixu.pdf In PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/a5e23762192a3109699ec8766fe47208/51829362214.pdfIn PDF document text
    • http://www.cda.org.hk/ckfinder/userfiles/files/40445342840.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8c445762b---32928311794.pdfIn PDF document text
    • http://benevolo.it/userfiles/files/5814256168.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1612f076540b0c---tagab.pdfIn PDF document text
    • https://theshamrockpublecco.it/file/woxajepafinobaridudu.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/puzet.pdfIn PDF document text
    • http://clinicaveterinariailmarzocco.it/userfiles/files/depedorujesot.pdfIn PDF document text
    • https://pottoka.info/files/galeria/files/17677179161.pdfIn PDF document text
    • https://ooo-kenk.ru/userfiles/file/66529118102.pdfIn PDF document text
    • https://penal-garazh.ru/files/56027414699.pdfIn PDF document text
    • https://muahohangnhat.com/app/webroot/uploads/files/24313553268.pdfIn PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/jowepawebowumo.pdfIn PDF document text
    • http://baoveantam.org/upload/files/rudijup.pdfIn PDF document text
    • http://brickform.cz/obrazky/files/22127336491.pdfIn PDF document text
    • https://elearning-chemistry.ro/userfiles/file/tibopixinupirowu.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/ajdh0ie2r4a9mupjm7gm6jknr8/31614660107.pdfIn PDF document text
    • https://service-panev.com/userfiles/naleg.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/pesipesamexo.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612fcb0e69bb5---42181211416.pdfIn PDF document text
    • https://dsverano.com/UserFiles/File/83210881251.pdfIn PDF document text
    • http://hoteldarim.ir/basefile/hoteldarimir/files/tadepo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=primero+lo+primero+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_off0000d6d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D5 10128 bytes
SHA-256: c2798c13fd30955792659dccf7f9bceed36c47bc87a2867fd422a2cfbb143c69
font_01_sfnt_off0000ed53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED53 19448 bytes
SHA-256: ac58b1250cde4244366ca619125c38237c78a9f3998f9b5517cf19a101d66a7a
font_02_sfnt_off00011eab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1