Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c4130fcab26d3ac…

MALICIOUS

PDF

174.3 KB Created: 2021-06-20 06:46:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 5540e1248d426f10030a20411840a9b0 SHA-1: 47184eef03997a9a5999aec1758d4bd014468b17 SHA-256: 1c4130fcab26d3ac3a1f55911a55f154a9ffcde7fcf2523055a258501c88ecd9
172 Risk Score

Malware Insights

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

The file is a PDF that contains a link farm pointing to various PDF files hosted on compromised websites. The ML classifier and ClamAV detection strongly indicate maliciousness, likely a phishing or trojan delivery attempt. The presence of urgency and download button lures suggests a social engineering tactic to trick the user into downloading the linked malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 8

  • 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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://franklinbristerharveyfamily.com/clients/a/a8/a8910385c57dfddac3c6311e2bd1422e/File/zodemukaponu.pdf In PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/f0h8i0te4smkcmuou0naoag5lk/55789421079.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/2sj2o6mv0t4djiamqr1jitutth/nagukosumitebosipi.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a17f3ddb9f7---45887248152.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074d4c8023cf---88334285641.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/kue0nbhcheflq6u668p4120iso/98221620508.pdfIn PDF document text
    • http://korean-school.hu/hangul/userfiles/file/lafemepopeveb.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/e28e97d38a23dd468aaf53d35f834415/33484325485.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3ba107599---bovomalodevenero.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb3bfd630a---59020983301.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b98e7bc0d9e---tiwasakeloroxavidaza.pdfIn PDF document text
    • http://saovietgroup.com/upload/FCK/file/fesalurusiwodiworujin.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/sorutulovotega.pdfIn PDF document text
    • https://naoshima-habitant.com/68980481200.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/a039540bcfd3b2886b95989d57846962/nazizunopibakuzalivuzatoj.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/kahu1omb48vbj8rl9663e1i3t6/tekurepalitasetawa.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b0e6c24cef2---sarupefejadebodadizul.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160c3e1f4a608b---zamefojuporikokid.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607146c4df8dd---41422097690.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://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=differential+equations+paul+blanchard+solutionsPDF 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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00026f00.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x26F00 25476 bytes
SHA-256: cee3e746b8aa3e3c48c60b05d212116ec56f0760f1b0efbbaeffbdc97492ebda
font_00_sfnt_off0001f2f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F2F4 17048 bytes
SHA-256: c0408df7d53288d254b619ce287c766bc2890ee96925d14fffda1cf79725f628
font_01_sfnt_off000229cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x229CB 5392 bytes
SHA-256: 67280d9e770a93d40d63b35a5449ffb577a5cdbded3b8bcf8c50c0d515af9bf5
font_02_sfnt_off00023c0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23C0D 15916 bytes
SHA-256: 7eb92a5e19369c15070173ef16c6adc3b5a72618e6c4aa3a3f9cbdb1cf74a7e9
font_04_sfnt_off00029c00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x29C00 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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