Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b308066888ad0ae…

MALICIOUS

PDF

83.6 KB Created: 2021-07-05 14:19:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e8564f13eb29055d57dd1280d04a3160 SHA-1: fd7a682cecba57b602c6875a52dd1775a975275a SHA-256: 4b308066888ad0aeaee56d56b7841ed51ae14890587b9e60ce1ed0faf623a772
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ClamAV as Pdf.Phishing.Trojan. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the presence of numerous external URIs and the link farm structure indicate an attempt to lead the user to a malicious destination, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/2ad95f20e020220e7380fbe147c8374c/tevuba.pdf
    • http://aucoindeshalles.fr/menu/file/29340333875.pdf
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607106e4066a0---9992463742.pdf
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/93613206980.pdf
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/dc307e33373cb9086e5a85de03d26427/59116947684.pdf
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/7e442f56a0a16157d98d527636bcd75c/74791584322.pdf
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/6bshclfuh137u0p2kqdi4erl4p/kuduv.pdf
    • https://100tmt.com/uploadimage/files/20210624100709.pdf
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/m6l0ih6tm43j14323791pl78kn/megamedinuti.pdf
    • http://amy-tsai.com/images_express/userfiles/files/kaxijefurigabozos.pdf
    • http://thetuckerfamilyreunion.com/clients/67950/File/69904584384.pdf
    • http://bajajsports.com/userfiles/file/risigurak.pdf
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5b07c177b7---sekatupediforejidakosidat.pdf
    • http://xn--o79av69abka850ab6c.com/upload/file/202106191247345486.pdf
    • https://abe-rdc.com/userfiles/file/dunoxavudimatev.pdf
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160bea46b58a21---13328775336.pdf
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1609f3e328db7f---77292314463.pdf
    • http://svazekobciorlice.cz/userfiles/file/mujebuwibivijitunelu.pdf
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f19f81c746---55095662288.pdf
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/ef1c00e4af759af6e41ebcda55bfa300/bimavekikozazudi.pdf
    • http://wksystems.net/HotelEstimator/userfiles/file/gitefuxom.pdf
    • http://ttlh.vn/storage/ckfinder/files/xamekido.pdf
    • http://mikailang.net/userfiles/file/20210507080511_1283010476.pdf
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/72648a61f8ddb54c1247f9a95763b9dc/pipinopejekolefim.pdf
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/fbc9e39b72ffec0b3e29c6c546c3bfbe/mozovelilaf.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=are+rocks+made+of+cells
    • 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_off0000e187.bin
f4cea65c4a34411ea52d374df73dae175a999b5685891a176bfddf7e3aed254e
pdf-font-stream PDF embedded font (sfnt) at offset 0xE187 18176 bytes
font_01_sfnt_off000111a8.bin
1e74ab0a8a667f01e0184504b8cf5bdb4f26e0b4c897e77d91890d58a1b9d4de
pdf-font-stream PDF embedded font (sfnt) at offset 0x111A8 10416 bytes
font_02_sfnt_off00012954.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12954 16792 bytes