Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8b4b86abaaef9eb…

MALICIOUS

PDF

69.8 KB Created: 2021-09-20 18:36:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7b8cdfdc2c18621d27ae65440b1962dd SHA-1: 8d685447e842577e8c038a398544331174e4a885 SHA-256: c8b4b86abaaef9eb7dfc2d3a9f122252bdc5fd887cd2b92c9cbb3e78564a946a
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites hosting further PDF files. Heuristics indicate this is a link farm designed to obscure the true destination or distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery.

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://gruppocaminiti.it/userfiles/files/zidadazaso.pdf In PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210903_840FFD976A6A4B4E.pdfIn PDF document text
    • http://royalleasingny.com/admin/images/file/34684031308.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1613c2b5be1875---xefaxapelawifaxuwize.pdfIn PDF document text
    • http://epwuae.com/userfiles/file/14535316673.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613a75da06ea4---xadebefalaz.pdfIn PDF document text
    • https://petek.biz/resimler/files/22838168666.pdfIn PDF document text
    • http://theprofitnesstrainers.com/userfiles/file/76511021145.pdfIn PDF document text
    • https://songhongresort.com/img/files/29350162786.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614196b6c432d---gexiw.pdfIn PDF document text
    • http://pretaporter-pegah.com/userfiles/file/diwadepawu.pdfIn PDF document text
    • http://antonellascarpittadesigner.it/userfiles/files/87039430450.pdfIn PDF document text
    • https://efficientinfocomm.com/ckfinder/userfiles/files/duwozuka.pdfIn PDF document text
    • http://ondamarinarest.com/upload/files/monerewog.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/1jgmng5ffc1oe1hkvg67pduq1a/31090134019.pdfIn PDF document text
    • http://magnumprint.ru/upload/files/xarotavanekip.pdfIn PDF document text
    • http://thienthaopc.com/upload/FCK/file/51802125449.pdfIn PDF document text
    • http://veoguidecostarica.com/ci/userfiles/files/72099425738.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7b19303a2---72656408708.pdfIn PDF document text
    • https://appvid.eus/userfiles/files/5337567884.pdfIn PDF document text
    • https://angel-juicer.com/FileData/ckfinder/files/20210908_DC159528525105F2.pdfIn PDF document text
    • http://fongyoskert.hu/userfiles/files/74362391048.pdfIn PDF document text
    • https://bahispesinde.com/gnc/veri/_files/tiliwapar.pdfIn PDF document text
    • https://anup.bo/images/files/nokafivaritaziniforakaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=transfer+files+to+android+over+wifiPDF 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_off0000b243.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB243 15564 bytes
SHA-256: f2a8e20b3ff29261ff041cf22891268046967ffe036cbfc53d28c3af00c6b8dd
font_01_sfnt_off0000d98f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD98F 10464 bytes
SHA-256: 6ad3ade47d6bd916aaca124c00bdbdc9874f00c2ddacb93d6ca799491ea57fb9
font_02_sfnt_off0000f181.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF181 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1