Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f5b5c60307b9fc4…

MALICIOUS

PDF

89.9 KB Created: 2021-10-16 10:05:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 08dbb53b459e36a198f7f8fdbd14ff64 SHA-1: c241c417d97c727130f2f929738f02bf2fcff996 SHA-256: 3f5b5c60307b9fc4e50b932622231e90d8e2e3f1af1855b7ff26e966fdb0cdd4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links pointing to compromised WordPress upload storage and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9910

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 http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16165b3a85fc45---tajaru.pdf
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16160ee9b1fcd0---voniseruvopotikatowepami.pdf
    • http://neoclassicalmansions.com/uplds/file/wiwopinogefisudewoxomik.pdf
    • http://kino-cosmik.ru/sadm_files/zapej.pdf
    • http://premiumcsp.com/uploads/files/palutuxuzosozebiwukojut.pdf
    • http://www.jysunshine-hotel.com/up_files/file/lisupoduzexor.pdf
    • https://xlquality.com/userfiles/file/50007867801.pdf
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/2e41089cb8f82692dcaa280909a64e35/51336684631.pdf
    • http://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/45517693442.pdf
    • http://ptaki.info/imgekoprojekty/files/zebizadabakagid.pdf
    • https://gencerenerji.com/resimler/files/bimenuzijijeduros.pdf
    • https://stehovani-ostrava.cz/static_pages_files/file/misewisuxumatoxek.pdf
    • https://pbchistoryonline.org/uploads/file/daxipeferavojamunarozomug.pdf
    • http://hoinhikhoavn.com/img/files/bizifajezokizofojupozemu.pdf
    • http://copy-office.it/userfiles/file/48556904199.pdf
    • http://galluccifaibano.com/userfiles/file/kolipuz.pdf
    • http://condominiobrisasdelnorte.com/userfiles/file/68468020841.pdf
    • http://eamenfaraz.com/cache/fck_files/file/31329736210.pdf
    • http://artpolyclinic.com/file/files/9273830895.pdf
    • http://autosvanbeek.nl/mindcms/js/ckf/userfiles/files/29057595591.pdf
    • http://tantusmarina.com/UserFiles/file/sazaxunux.pdf
    • http://mbjarrahi.com/UploadedFiles/New/file/33940769411.pdf
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/8274db156c1118d768ae3c20b427fef8/nuvakigubib.pdf
    • http://athaj2.specialty-match.com/upload/files/46755085782.pdf
    • https://feedproxy.google.com/~r/Gsjc/~3/HKUGBsJGI0E/uplcv?utm_term=from+euro+to+forint
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6ac.bin
450eea5fc67953cc3bdc764260aa6f1739571c17331c9588074966c3dbef4c6c
pdf-font-stream PDF embedded font (sfnt) at offset 0xD6AC 16088 bytes
font_01_sfnt_off0000ebd8.bin
9fd627d2958d5d0a212a605802d59baf23f5b9280d9654342dc873744da67430
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD8 1820 bytes
font_02_sfnt_off0000f466.bin
3271863f99bdf43d35b7c4f52c89b55a06c90f89e3c7552d35031ca5c5d9cf83
pdf-font-stream PDF embedded font (sfnt) at offset 0xF466 22832 bytes
font_03_sfnt_off00012a60.bin
6145db130a2a0afb385bbf648eb6d721a36595e50573d0bac776a85cd1600d6f
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A60 10076 bytes
font_04_sfnt_off000140c3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x140C3 16792 bytes