Malicious PDF — malware analysis report

Static analysis result for SHA-256 1dff436cc699a55b…

MALICIOUS

PDF

78.8 KB Created: 2021-09-03 04:00:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: e7a3cd3cef1dba117d37e150ec3aaeb9 SHA-1: 0077bebf87df9a31988ebef58e5054b103691b2b SHA-256: 1dff436cc699a55b7450e9d404a69a160e1eeeb4e5b6b69bccf9b5005597591f
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file functions as a link farm, containing numerous embedded URLs that point to compromised CMS upload storage and disposable hosting. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests a malicious intent, likely to phish credentials or lead users to further malware. The file's structure and numerous links indicate a deliberate attempt to distribute malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4163

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://ailizia.com/userfiles/bitazuwopuw.pdf In PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1609619822f13d---vuxaganemasulepu.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607851d5d70ae---63538007617.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/00a462d942281b5e6a7d7af25dc380ea/69334963623.pdfIn PDF document text
    • https://strategieb2b.com/userfiles/file/3403834717.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9e2f59443---62302728794.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/a6264b15742cd17b52dfa31bc3d81e7c/pavubu.pdfIn PDF document text
    • http://plafondchauffant.fr//img/user/file/muxizunivad.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160857993c6821---dugezibotifuberoz.pdfIn PDF document text
    • http://briztravel.com/upload/files/fojaw.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/b114f4de051c02635477d114d3241f01/pininejutajisatolosedanod.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082284dda484---jugabomitatogigikujiso.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-5/20210505195327913086.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075234fc9fe1---25040814767.pdfIn PDF document text
    • https://troypin.com/calisma2/files/uploads/juvawomopesuxoponu.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/65678087295.pdfIn PDF document text
    • http://farmaciacogliate.it/userfiles/files/patepisek.pdfIn PDF document text
    • http://qhzs88.com/admin/fckeditor_upfiles/file/2021072811415380554.pdfIn PDF document text
    • http://nattuvaartha.com/assets/ckfinder/core/connector/php/uploads/files/xabitibu.pdfIn PDF document text
    • http://vzwsportenmuziek.com/content_docs/8745768300.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/n2eq15pq5fod9qbri2561o58u4/34506795401.pdfIn PDF document text
    • http://szpital-sulecin.pl/images/fckfiles/file/15102184381.pdfIn PDF document text
    • http://amandamaitland.com/images/file/2578582130.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=c%C3%A1ch+c%E1%BA%AFt+b%E1%BB%9Bt+trang+file+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d51a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD51A 16628 bytes
SHA-256: d2d2c01a737cd46aa54508d62ca5f60f601164fb58f6fd941f41c1a564b9e904
font_01_sfnt_off0000ec8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8A 25936 bytes
SHA-256: 5595b1eca61a33a8e3d682a55cb343b6f38108af06a899c28cc1b5f14c44e303
font_02_sfnt_off00012d5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D5F 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc