Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e8be4f21385fdec…

MALICIOUS

PDF

80.7 KB Created: 2021-06-29 12:59:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 539608973f89d8b68693a56f898c12d8 SHA-1: db74235576dface6519dc04269d7da9c12aad638 SHA-256: 3e8be4f21385fdec069a868d722d7de2fc1c0e9ef5152c80d7ee87682ce5e009
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or link farm attack. It contains numerous URLs pointing to compromised CMS upload storage, suggesting an attempt to lure users to external, potentially malicious content. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9719

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://sportsht.com/userfiles/file/witabawaketanibotozaxud.pdf
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160aee0d5acc89---10465960462.pdf
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4fc7625cd---kesatasutowam.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/b2d288094f6b6e0cb002875459c2cbcc/7818350766.pdf
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d07650743---5156270903.pdf
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/53402056225.pdf
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f453e72871---21590891291.pdf
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/68ff8a8f297a516300a90708b3cafe9f/3327998577.pdf
    • http://blissrenewbeauty.com/newerac2c/userfiles/file/faxalazesuj.pdf
    • http://anvlaw.com/userfiles/file/35641599860.pdf
    • https://akapacha.com/userfiles/file/88771338155.pdf
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/17206332d70ee2a392d690f5ee64ae1a/degusivadozepilub.pdf
    • https://thehideawayresortpattaya.com/userfiles/files/39117334331.pdf
    • http://cnex.cc/images/blog//file/53185694918.pdf
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160832afb212f1---13202871950.pdf
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160b6fe8343a59---tojiwofeketifosalekidej.pdf
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/48pko0qouuklfjpp4dugb9fjq3/24707285564.pdf
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/mqqbhrrnncdfhl6iqhodgohrpd/40061001628.pdf
    • http://adamlegal.com/userfiles/file/50638627505.pdf
    • http://mygotour.com/FileData/ckfinder/files/20210527_C577BAE223CA69DF.pdf
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abdb6d638d7---74709081443.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac5206997ed---87074314486.pdf
    • https://monocroma.it/wp-content/plugins/super-forms/uploads/php/files/ca0e0ad775694e4e4e91d79979a44f86/dimoxusefelamofexujavevim.pdf
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b11a9eef430---5268094209.pdf
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/c6ee3fcad93e9078274dce9545d4b45c/29713627594.pdf
    • https://hiampelectric.com/wp-content/plugins/super-forms/uploads/php/files/179564e8c46b1e8bdf95b9ca68a5a610/59111343567.pdf
    • http://residencecarlofelice.com/userfiles/files/83124158586.pdf
    • http://kruengrangthai.com/files/files/51666570643.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=bootstrap+cards+example
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c4a6.bin
6032308dd63950722180a7fabb3f71acf2ec78fc0a632a13c57d89a219b7b88f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC4A6 16124 bytes
font_01_sfnt_off0000ecd3.bin
470e290952ef951ede6d6c7d5ca63c035db2632a033eb4bcd74a8159b858b555		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECD3 16352 bytes
font_02_sfnt_off000102de.bin
d7a8ea41771eec5def70f200542d90d0376f78c3b2373830ddf9843108ed0682		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102DE 10632 bytes
font_03_sfnt_off00011b59.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B59 16792 bytes

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