Malicious PDF — malware analysis report

Static analysis result for SHA-256 adad1c2843bc1bf0…

MALICIOUS

PDF

85.0 KB Created: 2021-06-27 08:36:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 802541b59a2d6a356649c3d6ea4960b9 SHA-1: a699cf58a738570d828a70687bb61b684ae98551 SHA-256: adad1c2843bc1bf0fc679f6a2d79ae0f6e7072397d988b389dafa2bf042409c0
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to serve further malware. The document's structure and numerous external links suggest it functions as a link farm to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/d344eb32d017dad7059a382c86c54f1c/87289390377.pdf
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b48b9436c1---batemologafiwexog.pdf
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c290c2ac821---86955012493.pdf
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160840e972d85b---zavazitosuxonejojovuk.pdf
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/44ap8htqr7fkp95kqvs9fetc21/kufibud.pdf
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/f55c90ef338b9648a054ce5415beac91/tizuputuxomonasa.pdf
    • https://aimhc.com/userfiles/file/gefevirakomogikolekipiwek.pdf
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/iqevfjf7jui5s3ub6foselj2st/zemazuvewijovutotikumobep.pdf
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/160813bb5bbd19---najiwewuse.pdf
    • http://hzbmsj.net/images/upload/File/55014790622.pdf
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/j1mdcn6ia58attd7e8rtjje7oh/dofamo.pdf
    • https://artbynela.com/uploads/file/bivefokufiv.pdf
    • http://bwc.lt/i/92069956779.pdf
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160850e288913b---wopupakibodegosuninun.pdf
    • http://eko-inwest.eu/upload/file/pepomunaxewaj.pdf
    • https://www.nexidia.it/wp-content/plugins/super-forms/uploads/php/files/165e7b015213d04a8881b24e74f78abf/48350822647.pdf
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/d6ab8b4a420afa0afdb1e0071aa8e4ac/88115587565.pdf
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087af4e52361---wezejozomerusufaxotixizix.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/09fe7a589cc8e3532b14ed5f9bc557e5/bedegoro.pdf
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160926b0a99ded---17111732412.pdf
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160994329da806---96350271530.pdf
    • http://msinziniering.com/userfiles/file/xakexo.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+fly+kite+easily
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec19.bin
0eb3f6cf17975adefca3b0a074df48c06b349f623ffb585738b0d9818bf3e643
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC19 10288 bytes
font_01_sfnt_off00010378.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10378 16792 bytes
font_02_sfnt_off00011b8a.bin
cb85fbb0aa2df1c18599731580ae49128fda1e907968aa39d1ecd582430195b4
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B8A 16768 bytes