Malicious PDF — malware analysis report

Static analysis result for SHA-256 d863cd79cf2583e1…

MALICIOUS

PDF

70.6 KB Created: 2021-09-20 07:57:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9b46115e5f025a498e77a7bb4f3ce7aa SHA-1: 7f9f8b81b003bdbe0c8a41a7aa7640d36fbe661f SHA-256: d863cd79cf2583e15f87a3af0682ce00a5272f5c6d2f985dec4d6d8c7f1f0894
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous embedded URLs that point to various domains, many of which are associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for human readability but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://classicalgardenstatues.com/uplds/file/14349450666.pdf In PDF document text
    • http://yogo110.com/userfiles/file/kutisuxefatemesofovuz.pdfIn PDF document text
    • https://butagallery.com/userfiles/files/21757288457.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/vugepefitajapu.pdfIn PDF document text
    • https://fundacionamigosdelmarcaribe.ong/ckfinder/userfiles/files/jegikutunusonivikugofek.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/16133048d73c9a---83744296048.pdfIn PDF document text
    • https://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/miviturikaxune.pdfIn PDF document text
    • http://stitesattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/79056043358.pdfIn PDF document text
    • https://hkparkkonutlari.com/image/files/27614400032.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/58975483418.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/16142d1494653e---44860016744.pdfIn PDF document text
    • http://gzperson.com/uploadfile/files/zetatolesugorojukikizixe.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161337ab80bd4f---52549776322.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1d4a315fc---fufagizixebagefuli.pdfIn PDF document text
    • http://share-world.tw/userfiles/file/60859761745.pdfIn PDF document text
    • http://baheth24cars.com/ckfinder/userfiles/files/xetikorasavamoba.pdfIn PDF document text
    • http://dvif.fr/userfiles/file/64807670903.pdfIn PDF document text
    • https://iringmalaysia.com/ckfinder/userfiles/files/fenesatumifemepisunowo.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16139aee1b745d---60035741836.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/wugajonelo.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc3cc2859a---mezowaxapapumisamuxirad.pdfIn PDF document text
    • http://theheavent.com/userfiles/files/49204964301.pdfIn PDF document text
    • https://mangalargalux.com.br/ckfinder/userfiles/files/98901780263.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/57208140665.pdfIn PDF document text
    • https://euinsuti.ro/app/webroot/files/userfiles/files/94738188912.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=theme+for+english+bPDF 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_off0000b73b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB73B 10504 bytes
SHA-256: 626bfed25298b6d7758ca29dc7846d8fa4af64e8ec160959c1c94d64c09b6e79
font_01_sfnt_off0000ced8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCED8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e6ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6EA 15024 bytes
SHA-256: d71068117f2d9f661b7eed5938a0375f026d0c38b77713ac27401e3a18398a0a

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