Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2c28d23e49c2b15…

MALICIOUS

PDF

70.0 KB Created: 2021-10-04 05:56:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: e35a8c301acefe62d802ad365bc0d58a SHA-1: acdbead73aafb02ef4f639cc7a0f7abf159b7333 SHA-256: c2c28d23e49c2b153c2b69b3c15e5872cfb2b7c84766d4313e0c42c5ca0beaa3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URLs, many hosted on compromised or disposable domains. This indicates an attempt to lure users to malicious websites, likely for phishing or distributing further malware. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://philabc.ru/uplcv?utm_term=conductivity+of+superconductor PDF link annotation
    • http://eventologia.com/userfiles/files/xunokapibolotuge.pdfIn PDF document text
    • http://inphilong.com/upload/files/3588770482.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/dade11d03d0f49c583ceef2c4972f83d/titatunumazebin.pdfIn PDF document text
    • https://sklepbonus.pl/userfiles/file/48894825079.pdfIn PDF document text
    • https://zohopinler.com/calisma2/files/uploads/81862154749.pdfIn PDF document text
    • http://dominoliberec.eu/images/file/files/nepuxazenev.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/6721161536.pdfIn PDF document text
    • http://telecycling.info/files/file/xemurekipo.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/1f2bd3a9dab19fada1300d030a5e1b6b/91683627708.pdfIn PDF document text
    • http://aotwresort.net/ckfinder/userfiles/files/posexurorupitelawovelan.pdfIn PDF document text
    • https://clubsecurite.fr/webroot/upload/files/xelaroviwapikif.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/161598eb384611---lotufowamowaralanipe.pdfIn PDF document text
    • http://inoxbienhoa.com/upload/files/murixoveritig.pdfIn PDF document text
    • https://lawtutors.co.uk/js/ckfinder/userfiles/files/78206712203.pdfIn PDF document text
    • https://postelezmasivu-liberec.cz/ckfinder/userfiles/files/dasoxefel.pdfIn PDF document text
    • http://sm300159.agchost.com/userfiles/files/sewape.pdfIn PDF document text
    • http://lexus-custom.com/js/upload/files/zuzoxetevomu.pdfIn PDF document text
    • http://vongtaygiay.net/media/ftp/file/62143439066.pdfIn PDF document text
    • http://hyunshin.net/userfiles/file/lifugupijimi.pdfIn PDF document text
    • https://institut-arabe.org/ckfinder/userfiles/files/79029918082.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/161543c8118ce9---92066716017.pdfIn PDF document text
    • http://ch-bovi.com/upload/files/satidilokulur.pdfIn PDF document text
    • 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_off0000b001.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB001 16584 bytes
SHA-256: 795d06791475c2aee5a4cd4eb4314f1681cf4b18d9c54c18196bab2d2611c3fb
font_01_sfnt_off0000d9ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9FF 10716 bytes
SHA-256: 333f23c5bd8475344a8fd3920872b2f5071b9c628314247f8574af733a77bf9d
font_02_sfnt_off0000f2d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1