Malicious PDF — malware analysis report

Static analysis result for SHA-256 05187a3085a1ad98…

MALICIOUS

PDF

73.6 KB Created: 2021-09-24 11:32:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 0bbca7164bc156a482e8c8c9c4fa0a07 SHA-1: ad2c55f2a696287bf477c9e53ac3f090f0e08be7 SHA-256: 05187a3085a1ad98ca376aec57d6b92d26d8ac7de06532c463331d0f7d04cc1c
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to numerous disposable hosting domains, suggesting an attempt to distribute malicious content or conduct phishing. The document body is heavily obfuscated and unreadable, indicating an effort to hide its true purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140c14dcad9e---mokixuj.pdf In PDF document text
    • http://makinsushi.com/uploads/files/71664289682.pdfIn PDF document text
    • http://ags-sib.ru/ckfinder/userfiles/files/bezogibe.pdfIn PDF document text
    • http://chaukitchen.com/uploads/files/pedilakorogawefikomoxe.pdfIn PDF document text
    • http://hrampetraipavlavosstanovlenie.ru/content/images/user/file/duxinadesuvi.pdfIn PDF document text
    • https://maytinhdalat.vn/images/uploads/files/solowujoxowedevedokom.pdfIn PDF document text
    • http://retailcop.ca/files/22397607462.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161434d39e7073---melevadorusotakudagiven.pdfIn PDF document text
    • http://niengrangchuyensau.com/upload/contentFile/file/92426412655.pdfIn PDF document text
    • http://zenobiacultura.it/userfiles/file///zaniwezoge.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/5841602925.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/161489e996730d---vuror.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/5c9a7795d322d8c23d76a4d5059ea7d0/salutezisijizotatodi.pdfIn PDF document text
    • http://hermandadperdon.es/userfiles/file/luzojuniberunazotiguviza.pdfIn PDF document text
    • http://phamtrangia.com/upload/files/nukapedepukorosenux.pdfIn PDF document text
    • https://koparieshorvathbusz.hu/files/file/23139836027.pdfIn PDF document text
    • http://connectcontrol.net/files/userfiles/files/3885000234.pdfIn PDF document text
    • http://covina.crazyrockinsushi.com/uploads/files/favovimubavuzavozikigixu.pdfIn PDF document text
    • https://kamwalibais.com/userfiles/file/60370325953.pdfIn PDF document text
    • http://www.insight-assessment.com/ckfinder/userfiles/files/94864505700.pdfIn PDF document text
    • http://j-line.ca/fck_upload/file/39609254846.pdfIn PDF document text
    • http://danamthanh.vn/userfiles/file/79091966813.pdfIn PDF document text
    • http://crmloccitanecr.com/campannas/file/zarevijanorepadevapivub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=energy+wavelength+relationshipPDF 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_off0000bb2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d341.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD341 10780 bytes
SHA-256: 8bb75efb8fc11e8bf2accba153b1657798999711bfbf798284887b97631aaef8
font_02_sfnt_off0000ec0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0F 17416 bytes
SHA-256: 140bc9c0f1db032b1496d2b4f65e4c344a536c3905f7b72c6044a0bfed3a46b7