Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcb9c393481e5c69…

MALICIOUS

PDF

81.8 KB Created: 2021-09-07 10:17:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2d5f2bf75f04eb7115983a7a2fa79d30 SHA-1: 4b5e1748ff5a2ab8a94978bef787ecd915fb4d98 SHA-256: bcb9c393481e5c6921dd41bc1e65f25a3ee361c8c85b7ff0b05d9ffbcd60cf9c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains an embedded JavaScript stream and a large number of external URIs, many of which point to compromised WordPress sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is a non-clustered link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious content via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://crewmak.ru/uplcv?utm_term=botanical+science+pdf PDF link annotation
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/a5a7c6b675ea62da4b34d32ac81832dd/depomuvaposenatodi.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16114fc038c32d---dutibudajinelekumapibubiw.pdfIn PDF document text
    • http://houtackers.nl/userfiles/file/demiwupigoj.pdfIn PDF document text
    • http://fitviewer.biz/files/file/67903514812.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/5sgvp7hisct8ujsssrh25jlga4/71465936827.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a3d3646b8b---basimifonaxesetiwemizexa.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/579dc628290d2db778de07d20156ad3c/82066760237.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c288e148b28---55382187406.pdfIn PDF document text
    • https://grupahatak.pl/admin/_fck_files/file/vixedokafa.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc8a8978145---30841666978.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/bixixotagadok.pdfIn PDF document text
    • http://diegogenna.it/userfiles/files/8461956510.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/81342023368.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9765772a4d---16402250730.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/a2a46826189a9e17f52ac7b626ffa465/fibuxasomenupawo.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/5710a109346835ed2f6f9d90ca173177/44878132268.pdfIn PDF document text
    • http://abwnickersonplaza.com/uploads/files/43790118322.pdfIn PDF document text
    • http://toyotaprius-custom.com/js/upload/files/wofebisitexeporu.pdfIn PDF document text
    • http://geoplan.su/userfiles/file/84800990996.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///nosutufufobuduzugamile.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/2021080209434025784.pdfIn PDF document text
    • http://sport-way.ru/img/file/91037813118.pdfIn PDF document text
    • https://fenicia.uy/fenicia.com.uy/uploads/files/34628694108.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c76e855cd4---zisepatilaturoxo.pdfIn PDF document text
    • 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_off0000db99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AB 17780 bytes
SHA-256: 56044955dcf71c5b0a40057b9c38ee500352c0169cfe7afb066fabf8b5ed4bd3
font_02_sfnt_off0001217c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1217C 10564 bytes
SHA-256: 36210177bcd2b8ecfee2d413c2055564e60902a89acfc891d17b471bb5ff0b66

Open this report in the interactive analyzer, or submit your own file for analysis.