Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6ddb91c08897073…

MALICIOUS

PDF

76.6 KB Created: 2021-06-09 00:58:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: b362f5f2e505960164330050399d7180 SHA-1: 0d4f009431f09af8a53a68fdc90ecdb3988ce799 SHA-256: b6ddb91c08897073e1f68f19e394675546d8edd514e6625533b3b6a0094dfcd8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS upload storage. The embedded URLs suggest an attempt to lure victims to phishing or malware distribution sites.

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://coretry.ru/uplcv?utm_term=fast+gospel+praise+and+worship+songs PDF link annotation
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa1a61a9ca---dobividapoxixafatanesi.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/efea660136a6e11583432f45413659e5/29027573039.pdfIn PDF document text
    • https://sinarwaja.com/account/files/koxaxigijuxov.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ba59bd6479f---88147588245.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/37121333404.pdfIn PDF document text
    • https://paperland.bg/uploads/file/88966274537.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/94052486961.pdfIn PDF document text
    • https://airshow-bg.com/file/8521746694.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/ca94734cbc3c8e7ca7e266afa9f9f16a/sagasopare.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/tiuughf7a73dvf9mla7ma2pajn/62554921830.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/3c4bpj7bv6oflb8qhtaprf77s9/pilawunagawanobe.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160709541516b8---ridoduboza.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098d6359f3f2---45565750651.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/6ihlfki7s2q4r67446fe8dmfoh/dofamagevobej.pdfIn PDF document text
    • https://mednet.mk/public_html/upload/userfiles/file/nenosogaloso.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/27e64c71a46c2a0ac8cef9779ee26843/52958807791.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e148.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE148 5056 bytes
SHA-256: 757ad3bdc8e1d569e3faa69355a7ee18821246fe14c3e1a249797761f013722c
font_01_sfnt_off0000f282.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF282 10880 bytes
SHA-256: 02a993e522fdf169855d45eb83cb6c0ef2457086a7b1551db2e2384e6203e5a4
font_02_sfnt_off00011781.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11781 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2