Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1bb7b761d96922f…

MALICIOUS

PDF

87.3 KB Created: 2021-06-26 00:37:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6f7bdad2369a3adc54cf3ab4191b4d76 SHA-1: e197693cb54fb309e0bce4ce2f3c2a9363fba3a6 SHA-256: c1bb7b761d96922f4f6da9e0e6cb68ce0c99229878f810f8cb2550d478a0529b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to compromised WordPress upload directories, identified by heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure itself is designed to lead users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160875bdff207a---83134690438.pdf
    • http://liccuza.ro/stiri_files/file/51398112962.pdf
    • http://spalovnachemolak.sk/userfiles/file/tubexomemepekiro.pdf
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/2b33asdj07khueqdb1t2ih8vhk/7911135039.pdf
    • https://songuryazilim.com/calisma2/files/uploads/62280870392.pdf
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2f0b0bb62e---7993227888.pdf
    • https://anfauglir.com/images/file/sudunilitip.pdf
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073d7980a6fd---15311543610.pdf
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160acc784ac50d---63193467109.pdf
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af957e3f6b9---volajasinosidud.pdf
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/c4434a6547a9b98dbff01c51cd63c0dc/jelaxusa.pdf
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/b4ckd951k8ojs05omu0uf50d5j/besixixibogedorizusapuz.pdf
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/318ae2a93f1cbe87a0634694f6bcf718/lolifepeluzuxunajav.pdf
    • http://nowyhotelik.pl/userfiles/file/gifazolazadoratozut.pdf
    • http://propellerclubsandiego.org/uploads/files/86812999015.pdf
    • http://duda-tech.pl/dudatech/upload/file/dakizagulajij.pdf
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/525247lbmlif459anrtqn21v92/23036137756.pdf
    • http://microlana.com/ckfinder/userfiles/files/xabudefu.pdf
    • https://alakharia.com/public_html/userfiles/file/71014362347.pdf
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/3v36ja2s8s203h59hqtopbbae2/jikesudafikefagarixev.pdf
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608a492517d14---97714530517.pdf
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee29af36db---23931598705.pdf
    • http://shethof.ch/cgi-bin/dynamisch/file/77287710919.pdf
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607bae8df1bae---romagaj.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/rttcgpc7i73u715b5uu9legme7/kodipuwanisoji.pdf
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/b7565c6076d0b2ea8d45a50c4f073ff6/xosewasita.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=hand+holding+rosary
    • 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_off0000f215.bin
e140bf710eca4b194abbb4349b177d9f80c7c6dc2ecbfab0b1ae6d8ee74b8322
pdf-font-stream PDF embedded font (sfnt) at offset 0xF215 10404 bytes
font_01_sfnt_off00010935.bin
af3b3808dcc2747a36610bb732c1254a5f99f20f6e8fe4cae42353b6f3c2d9e4
pdf-font-stream PDF embedded font (sfnt) at offset 0x10935 17528 bytes
font_02_sfnt_off00013682.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13682 16792 bytes