Malicious PDF — malware analysis report

Static analysis result for SHA-256 b66c19abe78167b7…

MALICIOUS

PDF

82.6 KB Created: 2021-09-18 10:20:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: acb9c68bfa1c62bde58e7e8a38f50ec5 SHA-1: 48750c91b6b5576cadeddc39b4ba68866ce58d76 SHA-256: b66c19abe78167b71c158aa7928e2733bc2304c4c1106bed0dd7f6a9d56938c3
184 Risk Score

Malware Insights

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

This PDF document exhibits multiple indicators of malicious intent, including a high ML classifier score and ClamAV detection as 'Pdf.Phishing.Trojan'. The presence of a 'download button' lure and a 'callback lure' suggests an attempt to trick the user into downloading a payload or engaging in a scam. The numerous embedded URLs pointing to compromised CMS uploads and disposable hosting further support a phishing or malicious download campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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 https://catamma.ru/uplcv?utm_term=wwe+2k16+iso+file+download PDF link annotation
    • https://52fantasies.com/home/holly/public_html/ckfinder/userfiles/files/85391540626.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/e5k1e60jo87bircfa1bh7ej560/14165446028.pdfIn PDF document text
    • http://parmalab.it/userfiles/files/68465605243.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/7d7feb0890946ea6c9f96f4ca5758d22/nalikujujilif.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/luxaxijepeb.pdfIn PDF document text
    • https://uangraja.com/contents/files/tagokoxikidukixov.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/e2e2e1c7f69ac7c26d88b682ca46a69f/titosifufap.pdfIn PDF document text
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/65514361761.pdfIn PDF document text
    • http://imobilestore.de/userfiles/file/zigofagaka.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/20276022954.pdfIn PDF document text
    • http://stevis.cz/files/file/lomigoberared.pdfIn PDF document text
    • http://el-system.jp/uploads/2012/files/88140577420.pdfIn PDF document text
    • http://yoshitomo-kokubunji.com/jcfiles/file/24538783400.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/jiwiwapu.pdfIn PDF document text
    • http://kientrucsangtrong.com/plus/files/xopesanizudefejiti.pdfIn PDF document text
    • http://vector-mebel.ru/uploads/files/jerikuzupujopuwejiwok.pdfIn PDF document text
    • http://chiari-web.com/ckfinder/optimist/files/ragatuposufew.pdfIn PDF document text
    • https://brianspradlin.com/userfiles/file/zalajipumumiwup.pdfIn PDF document text
    • https://autoprofi.ua/userfiles/file/43579338769.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/161340b3648306---77056412323.pdfIn PDF document text
    • https://www.barrau-philippe-sedeco.fr/ckfinder/userfiles/files/namatebarusiduwugone.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://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_off0000dcf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF5 18200 bytes
SHA-256: ee449a18b5d132548ea2a5541745fa31735359d5b833a82307269371ef79e099
font_01_sfnt_off00010c27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001243e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1243E 10660 bytes
SHA-256: 78ad5f957b984ec33bdf5c1a5ac6342ade89c232ccd0f9b846c5865f67754cbd

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