Malicious PDF — malware analysis report

Static analysis result for SHA-256 596d5942b7aff158…

MALICIOUS

PDF

63.2 KB Created: 2021-06-19 00:46:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 5f43d510755ecdae8baa38383121f4ea SHA-1: f4b591e09f4edbbc2ae9ce14c1fee45be9ce38e1 SHA-256: 596d5942b7aff1583011acb88d96ace2dbebf58a3e7b462afb4b395207ee00c3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The document contains a link farm with numerous URLs pointing to potentially compromised websites, suggesting an attempt to redirect users to malicious content or downloads. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://xn--80aamdqpfpr.xn--p1ai/upload_picture/15117909703.pdf In PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/lmqits625h7iv6a9pbt6rsvj68/jaboboputopolalo.pdfIn PDF document text
    • http://trans-serwis.com/userfiles/file/2267215620.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/82270761192.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b8d31146e8d---tejovowuvi.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160770f10a6bd2---9297391820.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607028dfe4702---90579632818.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/bujalawemiton.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160a6fa6c89639---72476531051.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/firiwadisoda.pdfIn PDF document text
    • https://kurtoglumob.com/upload/file/41631136947.pdfIn PDF document text
    • http://currycornersugarland.com/admin/images/file/79038244834.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4d38a5767---47535044140.pdfIn PDF document text
    • https://mumegram.com/userfiles/file/79305143763.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=size+zero+full+movie+in+movierulzPDF 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://scripts.sil.org/OFLIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bac7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAC7 4740 bytes
SHA-256: 5927f8b755db08776615e87875c0205f4e4c233e869ff70732ccf02de3f4d010
font_01_sfnt_off0000cadc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCADC 10964 bytes
SHA-256: 6fedb2f6d382f37d086c5c1d3d14590ef9e812c585eacf4e17e26011f43e158a

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