Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c86fb4098b924c5…

MALICIOUS

PDF

73.7 KB Created: 2021-06-17 19:47:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: cc9467544873917acbc4d25b1b2e0483 SHA-1: 7c2752eb3dc0cec1231cee57ce6afd90163e3dab SHA-256: 4c86fb4098b924c59f2eadf83f83854bae72fcb61f5ef3efae27e0aadac3619f
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains multiple links to external websites, some hosted on compromised WordPress installations, suggesting a phishing or malware distribution campaign. The presence of urgency lures in the document body further supports this, aiming to trick the user into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://allytemp.ru/uplcv?utm_term=ca+3522+due+date PDF link annotation
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/b370627280244a2e2243d50cb1acc577/51011032950.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/08598a576e16a3253ccd37070346d100/77109121458.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/gazimipem.pdfIn PDF document text
    • https://bushregenerators.biz/userfiles/files/4063726408.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095df3b0f15e---99998369697.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/iqnfuo91cki28315fmjffnhrvv/85862669760.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608617ca7e75f---vumos.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/62747265364.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/s9jlrfev0n65mnof314afdmlpm/25486342012.pdfIn PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/3b15c2b17615854b89d7e06f79bc9260/nivunoperolovopale.pdfIn PDF document text
    • https://adikkeempat.com/contents//files/59515663145.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1608310d1eff61---rugirerunogomujo.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/378dd695da02175afec0abc8d086034f/99473453565.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/namipapukupotujipujefer.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/baf373008e1d7ff9c17ac543325be41a/19684323998.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/lapasonipetakopimokaru.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/75670414331.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c21c04a490a---mumedo.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_off0000e411.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE411 4840 bytes
SHA-256: 1d5309627b4e402912a2aa4883896df17a5373dcedb7864cd98fac07412e0ab0
font_01_sfnt_off0000f49e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF49E 11012 bytes
SHA-256: baf72b40b194d75ed74f39895a2c85bb844c43f867a2d208e870ecd254322bd6

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