Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b30d451e773f222…

MALICIOUS

PDF

84.9 KB Created: 2021-07-23 15:00:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d820334e0fdee5d68ba461900d1c70c2 SHA-1: eabe751baeb0950b3f2b7477715e44db9504724a SHA-256: 1b30d451e773f22238e0cf5b9c4fa4c5d88946df0be330ee665f8f5e8229919e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080b63676bb5---17953312891.pdf
    • http://yishiweb.com/upfiles/files/20210723_195009.pdf
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/d6fbeac2e91d714fe95e419664eb30a9/4260201238.pdf
    • http://opusincertum.it/userfiles/files/38695615455.pdf
    • http://kochamsushi.pl/UserFiles/file/88235718238.pdf
    • http://paliukenas.lt/i/File/xapujisigokar.pdf
    • http://lsneotek.com/ckupload/files/voluwevuxarexujasajadom.pdf
    • http://ongnuocdenhat.com/upload/files/94655526618.pdf
    • http://brandiassociati.it/userfiles/file/gusudazixeluwuxezejolib.pdf
    • http://sy-smile.com/upload/files/30045873647.pdf
    • https://hv2barrier.com/application/third_party/ckfinder/userfiles/files/50916737500.pdf
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/add265cd9dc3cefe2a565361e5d73080/veridoxesif.pdf
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/f8e2a2324161c67ce63fca5cf937c156/85998541007.pdf
    • http://tunesistudio.eu/userfiles/files/bigirojomeramepa.pdf
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/d211b1b20d7bdd61e94d93a757cf7a7c/regovunab.pdf
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/8f3ac4484f25946a34ed5e7cb6f258f2/86164141595.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/39717750173a725855a31ba57b821a33/norusovetazaxetuzabodik.pdf
    • http://omonetach.pl/foto/ilustracje/file/powutupijozab.pdf
    • http://grandrosso.com/js/upload/files/gusigitodizuliworin.pdf
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2d7693e88b---93613973601.pdf
    • http://baloneacessorios.com/_upload/file///23985755557.pdf
    • http://grandchainfamilyfoundation.org/clients/85333/File/vegodomizejixudo.pdf
    • http://adance0112.com/upfile/editor/file/mepalorelavimus.pdf
    • http://architettipassarinmarzotto.com/userfiles/files/muvizulaxadexapetik.pdf
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093201d73dea---56094883603.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=how+long+does+it+take+to+get+prevailing+wage+determination
    • 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_off0000e66a.bin
b409832d8ab7a0d4b61a88fa4e647d3656ef3738ec6ab08b988320964c4564c2
pdf-font-stream PDF embedded font (sfnt) at offset 0xE66A 16916 bytes
font_01_sfnt_off0001123a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1123A 16792 bytes
font_02_sfnt_off00012a51.bin
f2bc6edf7b2f90470e8a641b6151541e97084ee5bb6929c7fc914b1c20ed4340
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A51 10968 bytes