Malicious PDF — malware analysis report

Static analysis result for SHA-256 8984586c0d602a24…

MALICIOUS

PDF

73.1 KB Created: 2021-09-14 08:59:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 86075e144deeb97067263d15ee2420d8 SHA-1: 565d3cefcaeb02cb1830a2f308d2b1e895e631d4 SHA-256: 8984586c0d602a24091e72f503713f6060378750532738bb53e59213a15f2b2a
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to external PDF files, some hosted on compromised CMS uploads. This pattern is commonly used to distribute phishing content or further malware stages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://goksirlambinowice.pl/img/upload/files/kekos.pdf In PDF document text
    • http://scherzerpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/32021227774.pdfIn PDF document text
    • http://oxigensupplies.com/shipinc/userfiles/files/99439375275.pdfIn PDF document text
    • http://www.louisianarebarcontractor.com/editorimg/file/8812352829.pdfIn PDF document text
    • http://maristaslardero.es/userfiles/file/52031934690.pdfIn PDF document text
    • http://moscowfashion.net/content/xuploadimages/file/30860634394.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/d2c3d94afe0f6711072273be819a728f/gaxudovetukobep.pdfIn PDF document text
    • http://leeclinic.kr/userData/board/file/40816524917.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/d2m91uu20f226ado7k07g9un71/vazazidikide.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/limatejonujanus.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/161344e6b96b0a---vokubimogeluworapas.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/lufuwomijotadajuwun.pdfIn PDF document text
    • https://justbuymeds.net/userfiles/file/93696269205.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/161383cd66cffc---sudafini.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/70365906018.pdfIn PDF document text
    • http://tzsunup.com/upload/38119937871.pdfIn PDF document text
    • https://atrax.hr/files/32064647282.pdfIn PDF document text
    • http://emilymillerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/17241475861.pdfIn PDF document text
    • https://viettincapital.vn/upload/files/91970304025.pdfIn PDF document text
    • http://erh-hu.com/userfiles/file/furabalatufamezawakaxevav.pdfIn PDF document text
    • http://thaicockstar.com/ckfinder/userfiles/files/vetamolumevanawevodevirop.pdfIn PDF document text
    • https://www.singaporemedicalclinic.com/ckfinder/userfiles/files/nawodaliwomuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=naruto+shippuden+129PDF 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_off0000b73b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB73B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF52 10860 bytes
SHA-256: 1b9ec9c80ca4a0c2df272b6d494533f017d4aaf1d1583bac495eb02636f81cee
font_02_sfnt_off0000e87b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE87B 18428 bytes
SHA-256: 6755cf991a1c1d7d8fdd981f2d12960e6725988ac22ed9c15e2074f6b73aef07