Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ea7940b7f46b902…

MALICIOUS

PDF

86.8 KB Created: 2021-09-21 01:17:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 984aa685f9200db6158bfb24d0e08a3e SHA-1: 73dbb41f62911eb59af1b10977f1d35e062979fe SHA-256: 9ea7940b7f46b902120fa8d502ddd533190eb6919ca8eaf8cbf6606b8ed31144
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also contains a large number of external links, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613be5e3f2905---wevoropo.pdf In PDF document text
    • https://tranhtreo.com/images/ckeditor/files/95912623997.pdfIn PDF document text
    • https://rijst.nu/userfiles/file/puraxuxaweziwotovofowiguv.pdfIn PDF document text
    • http://commandhousecreations.com/uploads/files/23943582172.pdfIn PDF document text
    • https://corpus.bg/files/fck/file/mafipap.pdfIn PDF document text
    • http://tribo.kz/userfiles/File/12620657527.pdfIn PDF document text
    • http://indigobaby.eu/upload/files/fesixeguginapimekizagekod.pdfIn PDF document text
    • https://limblength-sldf.com/userfiles/file/90408961080.pdfIn PDF document text
    • http://npi-management.fr/ressource/site-image/files/zaruzubogokaragufipevel.pdfIn PDF document text
    • https://www.sonorisation-auxerre.fr/ckfinder/userfiles/files/defitebad.pdfIn PDF document text
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/zukejejofajanadagemejalal.pdfIn PDF document text
    • http://connectcontrol.net/files/userfiles/files/vigifunutuw.pdfIn PDF document text
    • https://cplastik.com/data/cms/file/30408031237.pdfIn PDF document text
    • http://vallovin.it/userfiles/files/72894816392.pdfIn PDF document text
    • http://www.ville-civaux.fr/admin/js/ckfinder/userfiles/files/lifidogagogativafimuj.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/d0d77b43b579be5605e27c3261caac83/tenusoxogebibima.pdfIn PDF document text
    • https://barrier.exma.cl/ckfinder/userfiles/files/zuxusoxunisuvup.pdfIn PDF document text
    • https://hargagila.com/uploads/image/files/rutatokewuzi.pdfIn PDF document text
    • https://dailyhondaotomientay.com/upload/files/43663182874.pdfIn PDF document text
    • https://www.ksmt.edu.np/assets/ckfinder/userfiles/files/suzez.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/modfmv4tosqph51d2h7fjjs8k1/mijewilazevov.pdfIn PDF document text
    • http://cecev.com/stockages/files/soluwofofiki.pdfIn PDF document text
    • http://denis-lefebvre-services.com/fichiers/file/14511355287.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/derurure.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+email+text+messages+from+androidPDF 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_off0000edcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000105e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E2 10876 bytes
SHA-256: 332dbcf005d986b8fc8deed186c0591dabfe6926f6b1d9cf14ceff4224ec3661
font_02_sfnt_off00011ecf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ECF 18216 bytes
SHA-256: 0092cdfc70fbab45690b743392d1a0881f38b7761c88643c59da20d51688e767