Malicious PDF — malware analysis report

Static analysis result for SHA-256 b40dcea3d2729b17…

MALICIOUS

PDF

78.7 KB Created: 2021-09-06 19:18:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 279965321ce00c5ae963559c7a198b13 SHA-1: e356909f43319189672b20a88cbcbc60778d20ba SHA-256: b40dcea3d2729b173889d1e5205551e8d84299ddcfc582c1515b6f9fce3ae06c
156 Risk Score

Malware Insights

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

The PDF contains a link farm, a common technique for SEO poisoning and redirecting users to malicious sites. Several heuristics indicate this, including 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via the numerous embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160bb58df466ca---59007358193.pdf In PDF document text
    • http://doubler-son-capital.com/photos/files/13144514399.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/5jjvajjr20jtg2gucamiccarg7/zemulujowebo.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/36d15f8e31114fe778cc2f1f4c9d74b8/11959344508.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609843ed9a3d4---binapezowetedulekora.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d8370b8d0---51455581703.pdfIn PDF document text
    • http://livelyway.com/ckfinder/userfiles/files/7440341443.pdfIn PDF document text
    • http://ordinate-ltd.com/file_media/file_image/file/nigujetupele.pdfIn PDF document text
    • http://www.olivier-frey.ch/user/web/file/52916495873.pdfIn PDF document text
    • https://hinodanang.com/uploads/image/files/91945383985.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16098bbd0d7f9e---91569499566.pdfIn PDF document text
    • http://sshs1962.info/clients/3/33/33dcd814b32da85629335a95ab3d0158/File/fukaxosifavogetogi.pdfIn PDF document text
    • https://wolfgang-photography.com/userfiles/files/tirapalegoxarog.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16109b25661057---55931573379.pdfIn PDF document text
    • https://equinox-e.com/upload/UserFiles/file/lelujurusevogubatani.pdfIn PDF document text
    • https://optical-axis.com/uploads//files/202108110659488159.pdfIn PDF document text
    • http://vinaktv.com/storage/ckfinder/files/dugiwifujuza.pdfIn PDF document text
    • http://grapes4u.ca/sites/all/sites/grapes4u.ca/files/barojunalojidafenepuna.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160c87bcef1872---44467497715.pdfIn PDF document text
    • https://unosms.us/userfiles/file/29955015733.pdfIn PDF document text
    • http://wedding-box100.com/uploads/files/202108281919291734.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/xetejemosatonaduvorekux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=hillsong+united+songs+lyrics+pdfPDF 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_off0000cf0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF0D 17720 bytes
SHA-256: ade4b77c03c0d283db8536d82f7f9311db4e39e9db59fd3d911208aba6100f4a
font_01_sfnt_off0000fc81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC81 10840 bytes
SHA-256: 0343f8f0cd5e320f1f5c7d55d102f7943653baba80e32554dbd3f2ce4693e9ed
font_02_sfnt_off0001156b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1156B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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