Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c8e439f32d98959…

MALICIOUS

PDF

77.9 KB Created: 2021-06-23 03:12:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 5f43df28fe5b4e4115fb93875c17c7d5 SHA-1: de0fe7332f7807135b03b5a270998d197bd2c7d2 SHA-256: 4c8e439f32d9895989cef1e7837f0764e6443cebeec6d4d3076c97049e97cc56
156 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many hosted on compromised WordPress sites, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with techniques used to redirect users to malicious sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 https://crysiq.ru/uplcv?utm_term=wedding+invitation+project+for+premiere+pro PDF link annotation
    • http://thedewakohchang.com/image/upload/File/olimizuworedibujaf.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/lolexomolaku.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/fcf3b6011ca7796c28a55f0aa45faaa3/vifamowojegig.pdfIn PDF document text
    • http://birkhoffhi.com/userfiles/files/1667564792.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607d20da3d172---31773429763.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/beaf8fe4818ac9f4f9fdf33dce96aa6f/judovosotanazuzedegixew.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608c272e4fc7b---9216907086.pdfIn PDF document text
    • http://rld-carbon.ru/file/60953329145.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160945dac66202---67305683942.pdfIn PDF document text
    • http://keralabiblesociety.com/fck_uploads/file/86723673018.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/28550247699.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160837ae223ca2---kosumiwufedi.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/72a51e749f5fd1659ef5e3287fdbf055/gojimilu.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/tisudikixabige.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/202ae15178167b9bdbf067b35971ffaf/gazuj.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160bb8b99cb2cf---mekubud.pdfIn PDF document text
    • http://cephedanismani.com/images/pages/file/ruxutekuxerix.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608f9d17af096---tobovafumelivabuparakifer.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B3 5416 bytes
SHA-256: a87e9b2f56d3bb83bbf91330c5ff7caed1c0f5627e53cfae1301767cc094c71d
font_01_sfnt_off00010429.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10429 11400 bytes
SHA-256: 271a229833bcc153b1e4eccf15c8bd6dfb0fbd899e41709cbc787137b7d859d3