Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa5ae1d976c9e529…

MALICIOUS

PDF

96.2 KB Created: 2021-06-29 03:19:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: ac8b8ca5e8597fb15fcdd51128406865 SHA-1: 84255cdd2df04a047058508b70e7e86ccd79b3e1 SHA-256: fa5ae1d976c9e5299fdad28600f4fa029750aef8209f4ea12f18abfff5d5e5a9
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, which in turn host further PDF files. This suggests a multi-stage attack designed to distribute malware or conduct phishing. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9853

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c1cc7ff238c---futifotuzemikirajimu.pdf In PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/c8694457fbf9615056bc3e9e617b73f7/lafudabamot.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/2d91af94ab877c11ed568665a2020b92/44363575578.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/61925727223.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160acf06b6f5f4---jixumarutipe.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160afa2b472f7c---sutuvosibopomubepilisuxev.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0682cada56---joret.pdfIn PDF document text
    • http://ongnuocdenhat.com/upload/files/pirizarude.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/7d5b35ca96c00ebf09dfb435a3fd9306/nawofimamitiza.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/15661951292.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/nazigokamefebajuzunot.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/dc344c4970a48b06f7b85850ef48c9e2/xiroleraxuzefevale.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/perixarimivodexavuzobixa.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160a142bc5cbdf---kukepogerugumotanalipiv.pdfIn PDF document text
    • http://womensmentalhealthmd.com/clients/9/9a/9a9ccad1be43d50cbc9928f06550b956/File/54000236103.pdfIn PDF document text
    • https://jerseyshorepirates.com/userfiles/files/92403068885.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/07a98d2fc2b24ecccf3e7091f3d05c90/26599091609.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b49b34c309c---mozixifapuradekejedu.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/uj25gbp0oqrj1rcndi8797709m/moruduv.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/29250359127.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/75035307328.pdfIn PDF document text
    • https://mayurherbal.com/userfiles/file/dalinixukixo.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af6e701ae54---xokagireni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=deaf+mutism+meaningPDF 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
stream_004_off000102b7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x102B7 18684 bytes
SHA-256: ca7229f0160fe526b0d43a40bc82bc24b74f1c4734ec1a41eda5482a3e0deba3
font_00_sfnt_off0000dcfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCFA 10392 bytes
SHA-256: ddfe197fe77fc622e1ab2012eba6a5ac2db55513bde2f60048091c97679db4f0
font_01_sfnt_off0000f47d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF47D 3696 bytes
SHA-256: 1a7f64320a4eead6da9cc7d284f5b11c13ae3ce9c143b8d3b561089a7b22dfea
font_03_sfnt_off0001217d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1217D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off0001398f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1398F 23040 bytes
SHA-256: 9d8f6a7a71de12f14b9028dd3a7f79ee9d80363fe70856528968ea413cef8b59

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