Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae840471a135bfb1…

MALICIOUS

PDF

95.1 KB Created: 2021-07-24 00:10:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e3040ee988910a6b3b9cf56fd9033f86 SHA-1: 101445dd97d4411d0bcd63fa8aa5733740358828 SHA-256: ae840471a135bfb194420ea7945b0bef70ec2ff9807d22b1b9b62957c531cafc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing a link farm that points to multiple compromised WordPress sites. These links are likely designed to redirect users to malicious or phishing content. The ML classifier and ClamAV detection strongly indicate malicious intent, and the structure suggests it's part of a phishing campaign.

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 https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4be32c32b---36062374003.pdf In PDF document text
    • https://armagedonspedycja.pl/files/file/56430842141.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160820cedebc30---80706651003.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160857af9ae8bf---10180258082.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/01fe4c7427fa52870a53a0b3a930d4ca/85363472455.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/81499815037.pdfIn PDF document text
    • http://lasfyy.com/uploadfile/file/20210704115806338.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac760fa7e34---66729297295.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///radigud.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609ff050d4d96---madurefixadikarekapog.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/74502cf983fc2705d119ab02377c60cc/lobexujugujotulano.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/6eeb7ef9a90f7076e09d903aa8977bdc/tanokaronumisen.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/1043582720.pdfIn PDF document text
    • http://hacoauto.vn/upload/files/batab.pdfIn PDF document text
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/3lck24uosql8esdgo496d5j90d/29965166692.pdfIn PDF document text
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/76821989174.pdfIn PDF document text
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfc4049308---kilosoz.pdfIn PDF document text
    • http://fly.no1-yes.com/userfiles/file/kopabokopajev.pdfIn PDF document text
    • https://www.comperat-89.fr/ckfinder/userfiles/files/82886794617.pdfIn PDF document text
    • http://www.depomatrial.com/file/37834579729.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/7d87b56aa275d5d076664171a13338b5/mivepusotuzigoxexavigeze.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16094af8de8906---84918228965.pdfIn PDF document text
    • https://led7.ru/file/defesaxebajipo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=abcd+2+2015+hindi+full+movie+watch+online+freePDF 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_off00010c6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C6D 17588 bytes
SHA-256: cd734cdb52f692564404fd87a2ac2b74805e86569d70436bccb3d9adeee1d972
font_01_sfnt_off00013acb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ACB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000152e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152E2 11376 bytes
SHA-256: f0bd1154e5fdf5009ba284db1f920b49a3e45ec6af9f5ffef007fccf1988b91c

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