Malicious PDF — malware analysis report

Static analysis result for SHA-256 4366160dc38c185c…

MALICIOUS

PDF

99.9 KB Created: 2021-09-03 02:20:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3d85e364489a459b609461bb065eedae SHA-1: eb95e25c37a74a924cdc362ce1b6cfe461696c87 SHA-256: 4366160dc38c185c7f70d9d9623e038d4584802e70d06950a03351ad7764e598
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to phish users or lead them to further malicious content. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9784

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.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/e5ea2ac6baedec2a3c0a8c0b159ab40e/ginaxezoxi.pdf In PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a2570e3425c---vujufesifilitefusivodid.pdfIn PDF document text
    • https://shriayurvednagpur.org/public/ckfinder/userfiles/files/rofazigozazozarozode.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/002f7d1ca8332bfaa74b68c51418a6c4/84730335161.pdfIn PDF document text
    • http://zekidilektekstil.com/images_upload/files/29751997597.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/tqdlnvqcljvqe86nnqmfa7jq8u/moxuvovaz.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/rs7uskk0repbgcts1un3gufvoa/rulul.pdfIn PDF document text
    • http://phutunggiahungoto.com/uploads/files/52314584809.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/4fbf5c0c15ad5b902d30d5d823a5ccfe/menoviwawiniwatotufipo.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/b765deaff7c505b9e9db521e933c0ec0/22315043766.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/00af969919204f3d192c2ed1191dde9a/21286565492.pdfIn PDF document text
    • http://aisef.org/uploads/userfiles/file/file/80548270377.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d72dd9931---74206088787.pdfIn PDF document text
    • http://yogathoitrang.com/quangbasanpham/app/webroot/upload/image/files/24842220852.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/ef48dbcb92e18bdd201a3ca23205424b/34612153969.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/b44e13222e946f9c740148ccbf7ee781/87407549241.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160781aac08294---54687235378.pdfIn PDF document text
    • http://akcompany.vn/uploads/userfiles/file/zimemika.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d70f4c6dbed---43118780450.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/xitifiwo.pdfIn PDF document text
    • http://brnc85.com/clients/878796/File/64382233432.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/metotad.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/6e109347f523d61d9a2ee904337139de/92256207416.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/10424177978.pdfIn PDF document text
    • https://responsible-tourism-alliance.com/content_file/files/96199289593.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/0e9047e1d43c0928e27ea8b40ab71517/74142149030.pdfIn PDF document text
    • https://cremyco.com/app/webroot/docs/file/691608207.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=les+femmes+savantes+analyse+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_off000115d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115D1 23424 bytes
SHA-256: e2b3651058f754369b325160949fbc4de01aaaabb6a6d7d6d5f102c8a4e89d41
font_01_sfnt_off00015039.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15039 10484 bytes
SHA-256: 965c90301459fe7d8e7804cb68f3576a61ab38512849e3ac04bbc8cccc2ea7d2
font_02_sfnt_off0001681b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1681B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1