Malicious PDF — malware analysis report

Static analysis result for SHA-256 d88e6e5cbffcd48c…

MALICIOUS

PDF

63.6 KB Created: 2021-09-06 09:52:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 0d8dfc98693acfb348b1b17c24829544 SHA-1: 38a200e47764e809696c306cb55bdfabbfad4179 SHA-256: d88e6e5cbffcd48c70f98837b775c08607cdf572702fc3a1afad3d9ff93922ae
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3208

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 https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/vgrm2hsi6dn8j05ct6sgqftve1/16944360152.pdf In PDF document text
    • http://eiak.org/upload/editor/files/zakowata.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/diwetokotesumidiro.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/71l2uqie6v3h6jk0pi3kg2jtu2/69541518438.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094a7bf05aba---gizadukurubakuvopeguma.pdfIn PDF document text
    • https://sealordhotels.com/ckfinder/userfiles/files/ruzisubexetatesidow.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b4914d57473---winomanuripasubatu.pdfIn PDF document text
    • https://kuni.ro/app/webroot/files/userfiles/files/31910578354.pdfIn PDF document text
    • https://rjpexport.com/files/37845413889.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c714ce9130c---vewusejide.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/a3e29b1eb58e50d5ee4092661f9e7b96/69325530319.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160707f420188c---16242858150.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/lavaxuzakuwe.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1611b2d00a33c1---jugamejajofobu.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/2lg31bm26fpgg4trtkoblkoil6/gijexamebeduxebebajikot.pdfIn PDF document text
    • https://kawanmto.net/contents//files/firevivuvipaxanemop.pdfIn PDF document text
    • https://festival-bg.com/media/ckuploads/files/34072288206.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed09ab823d---dotuxos.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160e0ab19c6f8e---jaxapufodonoperekurevos.pdfIn PDF document text
    • https://losaltos.com/wysiwygfiles/file/vasagejubezuvewemid.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/c35a8e93a8506f32d64e4794b95d447a/kenowefunazuxisorap.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/nezaxibitibiwamir.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16082c18283787---bojenumupepisu.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/66063129766.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea098c5d90---25063767094.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/imdtrmq53jshpm00trfhoppns0/lumove.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=introduction+to+statistics+book+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_off0000b9cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9CF 15432 bytes
SHA-256: 3fc29cb1ce85cc559dfe6a5e9eba41160cb31a9528fd52e50c1619853ef85c20
font_01_sfnt_off0000e06a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE06A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1