Malicious PDF — malware analysis report

Static analysis result for SHA-256 e30a1c6d938cd3f5…

MALICIOUS

PDF

81.2 KB Created: 2021-06-18 16:44:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 1dff6052d2735ff6824cd87cb4588d20 SHA-1: e9ec2fcf2ff702150db3171782631442f4146a97 SHA-256: e30a1c6d938cd3f5cc6d98f26bc414bb88119cc62f7e1c1936582aefc7c850c1
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised WordPress sites, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the heuristic firings point to a malicious PDF structure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://canxetaidientu.com/images/file/vubevizopim.pdf In PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/58733452690.pdfIn PDF document text
    • https://www.djluk.co.uk/wp-content/plugins/super-forms/uploads/php/files/4crocboitl4ap82n92l870tlgq/pibasunudideluvup.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/13293a70c835278a00544839f276a748/xazumojulufubamomuribuk.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/2ptt6r2tessr2jsmo22k1efqvq/20663697090.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a159cf37895---32944282493.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/2i8ehk3eiep8du2fl8t18k14q3/64022251440.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a935ec95d27---21726997673.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/gibawixamo.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/46233384238.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/vluo5mn6na2vu51u5n1h599js6/63599360640.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8874998c11---62763815528.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093e2c10e96c---92759036468.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/43957989dc17c6518470f1f95d521dc8/58762728996.pdfIn PDF document text
    • http://thaoduocquyhiem.com/userfiles/image/file/53281720838.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/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=hausbell+h7+manualPDF 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e03f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE03F 2912 bytes
SHA-256: 1baa3efd180cf5f44d613abe34ea0380c2d25dd221f4ef864ac418d56f73cc35
font_01_sfnt_off0000ea9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA9B 5008 bytes
SHA-256: 8ac2f9357885f94afb4759e111f08a6d8aafdc7c13423705f2185fb327cde8ad
font_02_sfnt_off0000fb7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB7E 10968 bytes
SHA-256: bf2f66c242c2c72a97a20dc82d613dc4017251cd249bdf4d3823059ef41be168
font_03_sfnt_off00012133.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12133 16492 bytes
SHA-256: 89748e4e0f650d671d3765835ff3d7879aa2ce4fb583dae4b1762053d9460800

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