Malicious PDF — malware analysis report

Static analysis result for SHA-256 9aca861023164e07…

MALICIOUS

PDF

85.2 KB Created: 2021-07-18 17:50:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ab216dde63ae358a8801c3476257c0dd SHA-1: 5bf696a8a47ae9664968c4343d284545ffadeee7 SHA-256: 9aca861023164e0774bf946ae8d4052927026b4e07ac0efa6e35fa96634940d9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, suggesting an attempt to obscure the true destination or evade detection. The embedded JavaScript likely facilitates the redirection or further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/us11ml11vhk9jk29hcbmojl4ic/41625287238.pdf
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609be18b49f70---nazukulomixupafejod.pdf
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1608a884357310---16565625161.pdf
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cda85245e0---86143418892.pdf
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bc5c0504129---takegopupub.pdf
    • http://perseverance.cyou/updatefiles/file/lobabajes.pdf
    • http://jrpst.pl/userfiles/file/14856920478.pdf
    • http://31kouqiang.com/userfiles/file/1624618718.pdf
    • http://home-delighted.com/user_img/files/60150953122.pdf
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c1da073dd84---wozosudapa.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac6d056c02---patubivexegenijog.pdf
    • https://nationalshield-uae.com/userfiles/files/87016878146.pdf
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c0afea784bc---daxedid.pdf
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/875gki5hi4hr2a2vks71kl82qn/xojusis.pdf
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb0daca74c---87198669013.pdf
    • https://danielstrehlau.com/userfiles/file/dobife.pdf
    • http://adance0112.com/upfile/editor/file/13364408054.pdf
    • https://walnutcreekguide.com/wysiwygfiles/file/90617566906.pdf
    • http://quimis.net/js/ckfinder/userfiles/files/rivawuk.pdf
    • https://sharadsangam.org/UserFilesTwo/file/dasanotujen.pdf
    • http://sistersaviopublicschool.com/userfiles/file/badepexuzide.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=acid+reflux+for+months
    • 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_off0000ec16.bin
a4318037164f8df22798ebbc08c718aeed8824283fe7c1046fe104500571b9af
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC16 10764 bytes
font_01_sfnt_off000104a7.bin
c6b2b6444506b8941a5ead7ff25b56bde7acc05dd974e9a8859a3137cef6f5a5
pdf-font-stream PDF embedded font (sfnt) at offset 0x104A7 16668 bytes
font_02_sfnt_off0001301c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1301C 16792 bytes