Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e731bb3b52903f3…

MALICIOUS

PDF

87.5 KB Created: 2021-09-18 12:02:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 8b4f8c4b0bc17afd2c99d498900003fb SHA-1: e3a5aa4d3ffd68ae7391daa99675832655a26718 SHA-256: 2e731bb3b52903f39679401f86ca2f42d3bd5d6fbeb735c3e60d6a49cf9b0e2c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a PDF with a high ML confidence and ClamAV detection, indicating malicious intent. It contains a link farm pointing to compromised WordPress sites, suggesting it may be used to distribute further malware or host phishing content. The presence of external URIs and a link farm indicates a potential spearphishing attachment vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16140e2f6b6859---19693984533.pdf In PDF document text
    • https://ourcampuswindow.com/ckfinder/userfiles/files/27311299667.pdfIn PDF document text
    • https://ezokniga.com/uploads/file/mixazavaremavife.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/88255119058.pdfIn PDF document text
    • https://yuanfuconstruction.com/ckfinder/upload/files/54809847269.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/ku1j3h2nrosl9htld6rg0r3jqv/65491996088.pdfIn PDF document text
    • https://corpus.bg/files/fck/file/bupajonojalimisuv.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/14nkksn7ks66r947k3liinfagh/76474798655.pdfIn PDF document text
    • http://france-ex.com/images/blog/file/87160657485.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/iioffbbqtngv12qg5ttfqo89v2/vevazamukavuvew.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/468ce13b7c08ee4a669ab16b30e357b3/86305920853.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/34510908921.pdfIn PDF document text
    • https://siriusdynamics.com/assets/uploads/files/32084082630.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136554f41b51---sawivapewebofewaxeja.pdfIn PDF document text
    • http://buydecor.ru/uploads/files/vefajasidutem.pdfIn PDF document text
    • http://ykzn8.com/upfiles/editor/files/refuluzalutinezozujolovom.pdfIn PDF document text
    • https://proia.bg/userfiles/file/3247361336.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/zunevofixobejezi.pdfIn PDF document text
    • http://fabtur.ru/upload/files/40679158834.pdfIn PDF document text
    • https://afmiletisim.afmiletisimajansi.info/resimler/files/fibadikimozarewifur.pdfIn PDF document text
    • http://navigator-nsk.ru/userfiles/file/50940284312.pdfIn PDF document text
    • https://coastalholidayproperty.com/ckfinder/userfiles/files/12254981378.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=3x+vpn+pro+apkPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c6d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6D6 16164 bytes
SHA-256: a0f26d9ec2bc0bbc84dfb8c1a224a49f7f70479ac92e21d726acd811d43f3bd1
font_01_sfnt_off0000dc77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC77 22924 bytes
SHA-256: c791d7bbf806e5e074333a25a313c39fca23c2763055e7f41cde6b362a42a447
font_02_sfnt_off000118b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000130d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130D0 10044 bytes
SHA-256: f4a970598b1415ed3658f515fab450950907e77268992720886b9dccaeff40fb
font_04_sfnt_off00014730.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14730 1820 bytes
SHA-256: ef4c56b83544acc0eae329b123dcb13384a4443b8ee25b6b011fcec9f25c534c

Open this report in the interactive analyzer, or submit your own file for analysis.