Malicious PDF — malware analysis report

Static analysis result for SHA-256 894e95090f4f1e51…

MALICIOUS

PDF

85.3 KB Created: 2021-08-08 04:18:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 772bd331d04518de9013d3089734d00e SHA-1: 87db0ceb3e5ee60a6c81fa14cabfce010f82d52a SHA-256: 894e95090f4f1e51715107787fbffe1898ba1ceafa665eca7da0e464a51f7360
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://dtpokebar.com/uploads/files/45386682735.pdf In PDF document text
    • http://chiangmai-clean.com/user_img/files/dobit.pdfIn PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/muniwudafefuwukugubexo.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e89041618cf---kobasezibuwifaxogizago.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/16091caefdef96---61641981431.pdfIn PDF document text
    • http://armanetti.com/images/34861350273.pdfIn PDF document text
    • http://katachizu.com/img/news/files/funobatijimi.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/lumirerozajotewa.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf608da5ef---pedufikisotukotegosikeko.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/ec1d78f7d9b5cb0fddcc1640dd82f07b/puxetexejagisezumed.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/74526d23e884dcc01482ffd7b9b576d0/74229057676.pdfIn PDF document text
    • http://dahchen.tw/userfiles/file/16032323267.pdfIn PDF document text
    • http://pc75.net/upfiles/file/1625775854.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/bcab90d456fadb9b687e10638ef4e567/ruperilabadisik.pdfIn PDF document text
    • http://dvarenda.ru/upload/file/44569900298.pdfIn PDF document text
    • http://phutunggiahungoto.com/uploads/files/94300319675.pdfIn PDF document text
    • http://edgewood1962.com/clients/2/2b/2b25cacec04995aba37d275b9c35b4d1/File/numewefodidoroduxipuze.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d91058f20d---9146832982.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/7054215946.pdfIn PDF document text
    • https://777mto.info/contents//files/8069329362.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1610656d618122---mewezesisilinaporaxajetu.pdfIn PDF document text
    • http://lapempi.nl/ckfinder/userfiles/files/32854894786.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=what+is+the+significance+of+the+moors+in+wuthering+heightsPDF 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_off0000e82f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE82F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010046.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10046 10916 bytes
SHA-256: 5934586b0c1ccf0808ad2f1f07ffefebdff57d70ddd3f73070ee71a9fafbcb59
font_02_sfnt_off00011977.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11977 17244 bytes
SHA-256: 40773b7c6a046703f0179806b86e8fccd9e02d7edf6c49623fde59b69df9cb5b

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