Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1ceef03affd08cd…

MALICIOUS

PDF

75.7 KB Created: 2021-09-20 12:56:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 7e637b119d14d613659a8e3ab005112f SHA-1: bfe94da18bddfc7fbfbc0200dca1475e399df2c2 SHA-256: a1ceef03affd08cd6970bd03dd8e87a44ca4d1f5960dc81c25dc5ab30fab4c97
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, which is a common technique for exploiting vulnerabilities or redirecting users to malicious sites. Several heuristics indicate the PDF is part of a link farm, with some links pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute further malicious content or phish for credentials. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://cottonweb.net/userfiles/file/71623703598.pdf In PDF document text
    • http://otvorene-srdce.sk/userfiles/file/75751572459.pdfIn PDF document text
    • http://northcity.rs/slike/files/muzetuwisojasukenenason.pdfIn PDF document text
    • http://captaincook.hu/userfiles/file/jikonivuzisubifuvaxup.pdfIn PDF document text
    • http://xinxinhouseware.com/uploadfile/files/vajan.pdfIn PDF document text
    • https://pomacanthe-art.fr/imagebeforeafter/files/vojufopuxafumipifap.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/161325bf03322d---tolem.pdfIn PDF document text
    • https://nsaimmigration.com/userfiles/file/lidibupojozafuva.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/9804808910.pdfIn PDF document text
    • http://nepodoshlo.kz/ckfinder/userfiles/files/18930225833.pdfIn PDF document text
    • https://enilubricantvn.hoakhanh.vn/uploads/image/files/17323838151.pdfIn PDF document text
    • http://portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/nilokipafaxenu.pdfIn PDF document text
    • http://nwhouse.ru/uploads/file/29330830501.pdfIn PDF document text
    • http://mxagproducts.com/upload/browse/file/zafidurorol.pdfIn PDF document text
    • http://fijiembajak.com/uploads/ck_uploads/files/39580469264.pdfIn PDF document text
    • https://101doctor.com/uploads/ckfiles/files/6139f6892f117.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/623ec437cacbfff697ae522cec2c058b/mesizisenabamu.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/56290541326.pdfIn PDF document text
    • https://crc.creativechange.net/ckfinder/userfiles/files/2936575357.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613c31f8a938e---xupabened.pdfIn PDF document text
    • http://alburigiott.it/userfiles/files/22135956984.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=eisberg+quantum+physics+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_off0000bf80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d797.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD797 11384 bytes
SHA-256: f064a36963001185829192a9e88471e97b3ce09042ba8a8411d8063c0a06ee50
font_02_sfnt_off0000f182.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF182 18292 bytes
SHA-256: f8d9dcbb5e1f56245af69a1ff1ddb0b91534c39e20a904fc4433a1870b592705

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