Malicious PDF — malware analysis report

Static analysis result for SHA-256 c977fd24a8861a18…

MALICIOUS

PDF

70.2 KB Created: 2021-09-04 20:18:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c29ea4deff5a2d0da4aebd7acfe8e393 SHA-1: 709682abea384f7a5c3097b8fd3a24616740a92b SHA-256: c977fd24a8861a18d2f472f6dbd693b4acac9d24789c9e9da5678e153608d4a5
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ClamAV detection as 'Pdf.Phishing.Trojan' and the ML classifier's high score further support its malicious nature. Although no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it is designed to exploit users by directing them to potentially harmful URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5990

Heuristics 5

  • 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
  • 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://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb4546b8adf---fakanazorazetowejifu.pdf In PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/b3b8c8b0d26b63487bc7d3b115d45e8b/momerekonurosujojuze.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/ng9gia8muoemhckp4poi4koeu7/gekaroxesefuwukevibot.pdfIn PDF document text
    • http://inarchengineering.it/userfiles/files/33760950581.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9aaee9ea46---26658135011.pdfIn PDF document text
    • http://52963566.com/upload/file/202108231957216543.pdfIn PDF document text
    • https://activepymes.com/pub/file/naveruxulawogaj.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/lemejazadokokovivavozad.pdfIn PDF document text
    • https://motacademy.it/file/xekalodewis.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b82b64c0d58---vozameriguta.pdfIn PDF document text
    • https://doanhnghiepvietnam.org/img_duhoc/files/38686842810.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/121d2961038e26ee6664c2894d269ca0/sivelaretinubijaxinef.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160893a2eaa94b---nazawuzaledud.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ccce0121371---bukitulokagatawagu.pdfIn PDF document text
    • http://mama-care.com/UserFiles/file/refetezisudejuxene.pdfIn PDF document text
    • http://naszymsladem.pl/upload/file/14750770311.pdfIn PDF document text
    • http://cioccolatogallucci.it/userfiles/file/18354128818.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c2c3f5d90217aa4ebc16dfe0bda82add/woralamu.pdfIn PDF document text
    • http://beulahcooleycollection.com/clients/870349/File/warilipetetorunakerate.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160c998e442a84---39694268403.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608671ee62945---29658918343.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=aarti+sangrah+download+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD45 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e557.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE557 19564 bytes
SHA-256: e4cb02f21420b5339be001565549ad4c3392fcfe4787a8b08f6708d3122eafa6

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