Malicious PDF — malware analysis report

Static analysis result for SHA-256 78e8415bce58d3e1…

MALICIOUS

PDF

78.0 KB Created: 2021-09-17 04:31:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b75fac4a15432c3a9891e4c3e58290db SHA-1: 011d323e3e9795ec11b417d4b3fd5d3076e48790 SHA-256: 78e8415bce58d3e1f7ac46b95ea99e0205fb244a479a605922a4cfcdf36a6585
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, which in turn host other PDF files. This pattern is indicative of SEO poisoning or a phishing campaign designed to lure victims to malicious content. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://smwebtechnology.com/arishayurveda.com/userfiles/file/mubapurok.pdf In PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/161434aa1dfdac---zulifuzu.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1613238c448149---24004218149.pdfIn PDF document text
    • http://andreaslasnik.com/data/files/revijo.pdfIn PDF document text
    • https://iringmalaysia.com/ckfinder/userfiles/files/sewavefasepunusigovusoro.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/59260242718.pdfIn PDF document text
    • http://fskyok.com/uploadfile/files/sogedixowebuforolulisata.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143b962cbda3---63734586481.pdfIn PDF document text
    • http://balmybnb.com/t/tutorfirm/uploads/ck/files/wulefivazimeg.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/duqnne210s6p7fj692ap8me83j/99890594176.pdfIn PDF document text
    • https://derechosenred.org/aym_image/files/27089472814.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/kawekavi.pdfIn PDF document text
    • http://jualumnitoronto.com/editor/uploadfiles/17020670475.pdfIn PDF document text
    • https://alcoquimicos.com/ckfinder/userfiles/files/zomurepijexamemi.pdfIn PDF document text
    • http://lawyergz.net/uploadfile/files/bosapuzamuxubu.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/dazelinenaletozaduvukome.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/tatidatisosegifi.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/xofobekelonumusajogugazi.pdfIn PDF document text
    • http://nena-artspace.com/ckfinder/userfiles/files/27410532527.pdfIn PDF document text
    • http://ros-audit.com/i/up/file/lugawubinujowupanubizur.pdfIn PDF document text
    • http://vivo-mebel.ru/upload/file/xisasexuvokesuja.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8d9ae4bbf---lutijonekin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+set+different+notification+sounds+for+different+apps+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_off0000c8b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8B4 18532 bytes
SHA-256: 55fa9d57a897fb056ed3e5dbbef2d6ceebda5075bd12869386587e3f88e4c654
font_01_sfnt_off0000f960.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF960 10744 bytes
SHA-256: 324bf2f9627cbf719e4e80bed5d85a59a7e54a666fe6c48b10a14ea9e1ef1b01
font_02_sfnt_off00011242.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11242 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1