Malicious PDF — malware analysis report

Static analysis result for SHA-256 b37aa4592cfe2604…

MALICIOUS

PDF

79.7 KB Created: 2021-09-08 14:59:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 84b10d8986d8f687ec046de4bf089d72 SHA-1: dc580cdb22aa89de6f5ffbaf0a59b480172ae113 SHA-256: b37aa4592cfe2604a2ffd4c7d0bd79de2c230df4014468a045d05554c69ba30a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded URLs, many of which point to external websites, including those hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the structure and URL distribution suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/2193d3d75e782bc6e01e9fc5ba72a58b/24429511816.pdf In PDF document text
    • http://kelvista.lt/images/files/23254204860.pdfIn PDF document text
    • http://www.louisianarebarcontractor.com/editorimg/file/77183254900.pdfIn PDF document text
    • http://wadirumshootingstars.com/userfiles/file///nuvinojijexakofenuded.pdfIn PDF document text
    • http://dogalakustik.com/depo/sayfaresim/file/57560777878.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/cb3c95ef7c97a5cdffc726bee15074f9/bililabawotofezugoj.pdfIn PDF document text
    • http://papierplus.pl/userfiles/file/digukitugegumimovakirixi.pdfIn PDF document text
    • https://quangcaowebsite.xemlaco.com/uploads/files/35078003320.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/maruzewumom.pdfIn PDF document text
    • https://4wheelchile.cl/admin/uploads/file/subutiwowefupavidixi.pdfIn PDF document text
    • https://fanaf.com/article_ressources/file/dagoxavolorovigegala.pdfIn PDF document text
    • http://lor-rostov.su/userfiles/files/rezobekejufute.pdfIn PDF document text
    • http://geteffective.biz/uploadfiles/file/dibigowowukuruvives.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/24c7f0a11ac92bc8d5e4f6a5ad105025/88813397977.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/76876432858.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/fupexopedalodosawetenuzi.pdfIn PDF document text
    • http://epoxidice.ro/mm/file/fipusuvomoxob.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/f1aea3b34ccd0e29aefb2b2ced17010b/2868396385.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/97644944418.pdfIn PDF document text
    • https://shirbandifelt.com/userfiles/file/pebaroputilunimisopidu.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/zijeni.pdfIn PDF document text
    • https://valkexclusief.reviewz.eu/app/webroot/files/userfiles/files/jowuz.pdfIn PDF document text
    • http://alexdisinfestazioni.com/userfiles/files/18835265749.pdfIn PDF document text
    • http://bixenony.com/userfiles/files/xuxalitad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=free+download+software+compress+pdf+filesPDF 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_off0000d3bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3BB 10844 bytes
SHA-256: dc8d0d62ed75e545a23d75d7463a071696ea9555a6f0a8f625120ff6f58afe0f
font_01_sfnt_off0000ecc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC7 16920 bytes
SHA-256: 2821a541e34005a765e2adf72276324708ed19b78ef198126b0b32a492f73548
font_02_sfnt_off0001186a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1186A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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