Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bc30bb2e820d5ee…

MALICIOUS

PDF

85.6 KB Created: 2021-09-09 08:58:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a72323392bc664177c92c1eed48e9da6 SHA-1: b0126d38e6c7eb42e61a5f8b6413552f290956a7 SHA-256: 5bc30bb2e820d5ee747e25860852870d4f7c538b63a79116d67a3c08dcf2564f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are identified as a link farm hosted on potentially compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://koreabulk.net/userData/board/file/10368288429.pdf In PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/fe39edbc5561392cf08b52edd9bf1ff2/62544939904.pdfIn PDF document text
    • http://koyomisushi.com/uploads/files/72200474462.pdfIn PDF document text
    • https://stka.gr/ckfinder/userfiles/files/repur.pdfIn PDF document text
    • http://www.psoealora.es/ckfinder/userfiles/files/2418955442.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/161330edc240a5---gosikugoruradi.pdfIn PDF document text
    • http://langmoon.jp/js/upload/files/72809331179.pdfIn PDF document text
    • https://huanghecables.com/d/files/64935934523.pdfIn PDF document text
    • http://z-him.ru/userfiles/file/61700658052.pdfIn PDF document text
    • http://zoo-foto.cz/userfiles/file/49195522432.pdfIn PDF document text
    • https://jobtiara.com/files/files/18984198465.pdfIn PDF document text
    • http://monteconsultants.com/image/upload/File/63780439313.pdfIn PDF document text
    • https://manorhair.com/uploads/files/202109082104011322.pdfIn PDF document text
    • http://szamosiszerviz.hu/feltoltott/files/30673699403.pdfIn PDF document text
    • https://textmakareknutsson.se/upload/image/pazamiv.pdfIn PDF document text
    • http://aci-immobilier-douai.fr/userfiles/files/dadebipefunasizim.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612edbf2590c2---rofuraninajusidajiluxe.pdfIn PDF document text
    • http://unitec-egypt.net/userfiles/file/soluga.pdfIn PDF document text
    • https://aletihad-group.com/userfiles/files/96082810782.pdfIn PDF document text
    • http://deccanquest.com/konadnew/userfiles/file/rarenibigofodiwibetulawu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=moving+texts+from+android+to+iphonePDF 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_off0000e759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE759 18744 bytes
SHA-256: 87db381b253624a35673b11f3bfecf3f30df225828a1becaef0e30d758dab4b1
font_01_sfnt_off0001179c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1179C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012fb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FB3 11060 bytes
SHA-256: f287c67aa3cd59b6b07b93ee534e34e527ac60d6b056edb454a2aa2a039baa08