Malicious PDF — malware analysis report

Static analysis result for SHA-256 8799381f804bc894…

MALICIOUS

PDF

83.1 KB Created: 2021-09-08 00:26:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 98b19d8c25532c17071511049960b98d SHA-1: 38e53015cec4875701ddc30dfb09acc6e4de3f55 SHA-256: 8799381f804bc8942989bba8b108951eb5790124047d3dbb03dc95dcf06f4545
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple distinct hosts, many of which appear to be compromised CMS uploads. The embedded URLs, such as http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1606d873543ff0---vidupepaviwotopelobesosim.pdf, are likely part of this malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://astorandblack.net/emailer/userfiles/file/80278879633.pdf In PDF document text
    • http://ourjamesfamilyhistory.com/clients/1/14/146a9f92d0a296c7c29e793db058bb30/File/setipipipebemama.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082d2bcbbddf---70965014415.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1606d873543ff0---vidupepaviwotopelobesosim.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/noth8nstgfg9cipbcjq2aghekh/safutupijufojotudizuwubi.pdfIn PDF document text
    • http://wwpokebar.com/uploads/files/vafigavubapademudoku.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/597dce10ca9e2b82af5a17d8d59e05df/xiforudofesiwamazib.pdfIn PDF document text
    • http://1-cx.com/ckfinder/userfiles/files/wogigubedufo.pdfIn PDF document text
    • http://lucann.com/Upload/file/dizaxutuwob.pdfIn PDF document text
    • http://ipceurope.com/assets/file/kuwosafa.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/1ac1b130e087dd5117da5d7350d8e443/57021019159.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/202162082364524.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/km1mtd071537rtk1ct2el354e4/dilawufevoxi.pdfIn PDF document text
    • http://sanzmendia.com/userfiles/files/1844949043.pdfIn PDF document text
    • http://interstroy96.ru/uploads/files/9448823950.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160940f4952408---77738649466.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16073712c66aa0---rezirubatosopigedolodose.pdfIn PDF document text
    • http://www.me.ntou.edu.tw/ckfinder/userfiles/files/20210825_040557.pdfIn PDF document text
    • http://lawyerstitleescrow.com/clients/9/9b/9b7cfcecb5e5abb6b877b2b1d59b4eb1/File/45658199890.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/39712613602.pdfIn PDF document text
    • https://asiastudy.in/ckfinder/userfiles/files/fesotofofewafefi.pdfIn PDF document text
    • http://sirmamedia.com/ckfinder/userfiles/files/jaxivotofiruv.pdfIn PDF document text
    • https://vanrun-it.nl/userfiles/files/29961654735.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/bb5da3be5ef8c02340d3e586c39cd1e8/sajotumokebobuduramok.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/11e2d0c0f8e5ed104e7c0dcd3cbb3744/buwegose.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=quantitative+analysis+techniques+pdfPDF 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_off0000e0a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A4 10980 bytes
SHA-256: 43fa2cf5190740fb47770d1a7eb2e74a7df55880f8e1befdf7e40ab8a7cd6072
font_01_sfnt_off0000f9fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FD 17376 bytes
SHA-256: 20f8068c303b3e2abab9721a006a3ad321f01e82246fccc5f0ee7f95b0abf265
font_02_sfnt_off000126e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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