Malicious PDF — malware analysis report

Static analysis result for SHA-256 99ea4397fc91b536…

MALICIOUS

PDF

87.8 KB Created: 2021-08-19 10:55:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 942263e5b9fbafa495a8081aa79e33fe SHA-1: ad2b12540408a94efc434c0df95ba6f3c3e2b6f1 SHA-256: 99ea4397fc91b53649fd50e01ced65626981cf6c0efab1726e419717badcadbd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

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://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/8bf1fdc5d409c67a9cb13b3cc99353ef/79683009526.pdf In PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160728d837d9e0---55771808126.pdfIn PDF document text
    • http://biurod9.pl/public/userfiles/file/tokagixulazenuk.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611035aa091d5---673126227.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///wejizifazugawixed.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607197b818a26---88805258641.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b055ca6233a---21285727187.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/510b6f80284dbedc9d21410ebbd838a3/56027020567.pdfIn PDF document text
    • http://lungshingcentre.com/userfiles/kelirumumusifobevu.pdfIn PDF document text
    • http://siltherm.com/ckfinder/userfiles/files/dakumoxezuted.pdfIn PDF document text
    • https://artlabjo.com/userfiles/file/pinexowav.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d3bf1aee67---76020314587.pdfIn PDF document text
    • http://ruegen-ferienhaus-schneider.de/userfiles/file/luzawe.pdfIn PDF document text
    • http://emannsltd.com/userfiles/20705822759.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607843c2c3652---60733928167.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/16085e9287b706---44623458671.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/lenojo.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf14a350e8e---24814162556.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/d8103b0e6286b587c4d8d9ce928f5123/motuvadikobaduwivenizop.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160925ae491c4e---5876976542.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea67b5f731---mafalivelasinigetajo.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/fln12kifs5bqvlg4flm3tlso26/gegisavuzezosidapeku.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1610e4855e3cab---toboxitom.pdfIn PDF document text
    • http://poslovniimenik.net/firme_data/files/fagegugawaxoxosuvi.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/81141563007.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=tower+defence+mod+apk+downloadPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e600.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE600 1692 bytes
SHA-256: 6df00093d1a1fd8b8f95901b42ba2863538c90606311dd4adf1993a433792d13
font_01_sfnt_off0000ee04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE04 17944 bytes
SHA-256: 4965c58f964f57fdd2fbb200e23c6cf141d0bbc75282bc2f1df3ac489e7aa12d
font_02_sfnt_off00011d92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D92 10564 bytes
SHA-256: fa3838e29dc59e0fe83fd685a8aa699209b566e12b7fda62dbcad28b16506864
font_03_sfnt_off000135b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1