Malicious PDF — malware analysis report

Static analysis result for SHA-256 478552de3ede860f…

MALICIOUS

PDF

85.3 KB Created: 2021-07-14 05:14:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: fd66b4b9c28e354a4c969abfe49d439c SHA-1: c4ef923932f5ec231816d58225c9a15f7ac50117 SHA-256: 478552de3ede860f5d9f0275fe2dd013f05037ff8e748b4202103b2daa7e778b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware hosting sites. The embedded JavaScript is likely used to facilitate the redirection or obfuscate the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/957499a2705b65a13c8d82ec76934598/77880701084.pdf In PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/5646513643003bd5ddeb4f827e1a88f2/75422353435.pdfIn PDF document text
    • http://maduraigarlandshop.com/userfiles/file/46534724804.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160d8dd9d3a60a---zafufidolipajo.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/dae045fc4ff46d16b2a32595e46494ac/vimijilugetavanapone.pdfIn PDF document text
    • http://1137.jp/app/webroot/js/ckfinder/userfiles/files/94377110716.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/iii52apuktrmjusrtroneb9usr/mevukorizisolud.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/802302c8e5ee9f2f38e2f82676400650/girexo.pdfIn PDF document text
    • https://nguyenthelong.net/userfiles/files/xalorotofikiwupan.pdfIn PDF document text
    • http://countryroadssiberianhuskies.com/clients/e/e1/e1b2222506e4b6fd6c510396e08362d3/File/44020744884.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/otbcbklf4k2bqr28bngvbuvj44/69932596043.pdfIn PDF document text
    • https://fairtradeportal.pl/userfiles/file/wugapowowirokunazijubova.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/lpqpalvp3mr1l8lp7vliiqp957/butofopo.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/03b60fd87af764bf81587812f4845fcb/xugafozovovisup.pdfIn PDF document text
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/7blopi494605ee7os0ifn3gs2m/wipefubuxunikozerujitovak.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/773c610d5165f8e3d9b7ea8a4d41444e/luwubafijusopud.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b31d8f78326---majedesesamadatifa.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/bkkvf6aaqfst1po4il2qqea6ot/22850821909.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088b246a76ff---88568650657.pdfIn PDF document text
    • http://www.cddfct.com/up_files/file/dofaxamizepijadu.pdfIn PDF document text
    • https://istanajpdua.com/contents//files/pewineletefiwesoxurad.pdfIn PDF document text
    • http://porpora.info/imagenes/imagenes_contenidos///75390223905.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=redwood+canopy+toursPDF 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_off0000ebaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAA 16812 bytes
SHA-256: 72d934df8274befb06ea28f7c78fb6a81e9f5fd4009ff4899ab134cff0d97e0d
font_01_sfnt_off00011776.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11776 10716 bytes
SHA-256: 758a7fb7fa416a87ff4383c6f8f0e581088e2ccfb36365107b18ec420a4b7b8d
font_02_sfnt_off0001304e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1304E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1