Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0c4431b98294c95…

MALICIOUS

PDF

69.4 KB Created: 2021-09-24 22:28:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 81fc5c8851a23877bfb3620e2e5336c8 SHA-1: 4b33cb7485bd8adf11717a811a825e45aed1498e SHA-256: b0c4431b98294c95c9eaac89abf7317ff19f90ef39231f66f5b7ae4dfb49a620
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://dnepropress.net/files/file/xajifanotarisarute.pdf In PDF document text
    • http://ruihuitax.com/files/file/divifirolusukig.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9c430c5ef---gitalogidowubetodite.pdfIn PDF document text
    • http://etre-belle.su/images/file/31746862327.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9ce898b7d---talalanadafevatezero.pdfIn PDF document text
    • http://aaz.sk/editor_uploads/files/lixanazibugeneboka.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/161358f6796947---56837791970.pdfIn PDF document text
    • http://hairfibers24.com/upload/file/wirizitijoxijimekobu.pdfIn PDF document text
    • http://podlahyadvere.sk/editor_uploads/system/files/xidibowaserodekawofetoso.pdfIn PDF document text
    • http://www.kotolantopeni.cz/files/gugitajijemorufase.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/50488189628.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/wunadujozirobironuma.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/galoferewa.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/mapudefumegogapiv.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/4ab4ae6794de4f2276c1a1f44c160846/ruposeroxorelid.pdfIn PDF document text
    • https://campermagazine.tv/public/file/1418353325.pdfIn PDF document text
    • http://hermandadperdon.es/userfiles/file/zebatopiroxo.pdfIn PDF document text
    • https://limberhurstgallery.com/imageuploads/file/98740324436.pdfIn PDF document text
    • https://futurefacesmiami.com/uploads/file/masijufileruk.pdfIn PDF document text
    • https://kiofruits.com/admin/uploads/files/zifazugexofot.pdfIn PDF document text
    • https://successalpha.team/upload/files/fiduwu.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137fed3e556c---21073115998.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=redmi+note+9+pro+upcoming+updatePDF 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_off0000ae89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE89 15804 bytes
SHA-256: 51261c10476f36a26d78e010abefd93339ebb672852322d0c79a66fcc97b1ae7
font_01_sfnt_off0000d6c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C5 10956 bytes
SHA-256: e412134d7e93022c66602ad8b2b195807e2232c6a9fac9c2d04579e107e08a06
font_02_sfnt_off0000effb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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