Malicious PDF — malware analysis report

Static analysis result for SHA-256 5190d033cfbe387a…

MALICIOUS

PDF

83.9 KB Created: 2021-09-07 17:48:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3b1e804ecf8162240aef85f016733030 SHA-1: f9379e0f5201aaa916d1d017be35f3b630ea48d3 SHA-256: 5190d033cfbe387abbe8b1d9abd4c10126331117f67f148fad2b09154d70e8a6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised websites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of multiple PDF link farm heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://www.odnpoznan.pl/fotki/file/file/nomibofanari.pdf In PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/19840b069e0ccec68479a4d14760afa3/pudixosegusodosefofozonar.pdfIn PDF document text
    • https://e-fasteners.eu/media/file/77128131482.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160aae583b19ef---30516888044.pdfIn PDF document text
    • http://pomelieagency.com/userfiles/files/58024065503.pdfIn PDF document text
    • https://habibitours.com/ckfinder/userfiles/files/17020485986.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093fa348874f---juzudoditobaj.pdfIn PDF document text
    • https://coolinterier.sk/upload/files/furagabuba.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f942e074dc7---23897706709.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/wekawaxekejan.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1b64a2fcc0---fonuwixibojuw.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021070202431937.pdfIn PDF document text
    • https://lee-trading.tw/archive/upload/files/70256675365.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609485e9d2c0d---penokabepojumebelopagateg.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/c68592bf69b19d6b3e1e22aac6a66731/davuf.pdfIn PDF document text
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jutozidedajen.pdfIn PDF document text
    • https://go2germany.ru/files/file/wafiledagojimed.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083623609817---68368978634.pdfIn PDF document text
    • http://ash-graphy.com/userfiles/file/65287446991.pdfIn PDF document text
    • http://someteme.com/archivos/_20210905061336.pdfIn PDF document text
    • https://wickedcheesy.com/images/file/76899332985.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=discuss+the+literature+review+process+in+research+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_off0000dff4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF4 10972 bytes
SHA-256: a1af9587efa4a61086b7f44319dec75dd5f04bcbb6b9d4d929bc3f650a356fd5
font_01_sfnt_off0000f96e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF96E 18744 bytes
SHA-256: bf732a8bd0175be908a9b0e771f2aea6bec35e703455ad05fad41c95244346af
font_02_sfnt_off0001296c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1296C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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