Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b093391fdac5c8a…

MALICIOUS

PDF

70.6 KB Created: 2021-07-04 02:34:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 7c0bd2f66db1eeadab5a5c5427d5663e SHA-1: 70973564c358ad604d1b1cb4a6b45f2f96fddb0f SHA-256: 4b093391fdac5c8a1e3a0f66b3fe5018543d2b47beb58f64fcf6aefbdb4d1c68
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous links, many of which point to compromised WordPress sites. The ClamAV detection and ML classifier indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The presence of link farm heuristics suggests a deliberate effort to obscure the final destination and potentially leverage SEO techniques for distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5901

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://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7b08d2113---vudop.pdf In PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/zubitubiberodevuredazil.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/16093e60228c90---62681469302.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160acb20e97ea3---46305181686.pdfIn PDF document text
    • https://foodvellythailand.com/upload/files/nolelofuzor.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/1f9b6f9f06efbfb0877dea2452d032d4/12497576960.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bd7e1b1cb80---gimosowezovigito.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071d38e6184b---2685021257.pdfIn PDF document text
    • http://geometrabottero.it/userfiles/files/pulupuwazedadatizorod.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160b74f24c575e---86752162307.pdfIn PDF document text
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jurirekabir.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/0aa36543aa8b759baf2acf199f935554/baxesuxisogifat.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c997bbd376c---88041344402.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608abe8924d5e---foluxobivobipimasuva.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/brbn8bj3m48bvhfbkf2mtpdd8f/24098596418.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/gklfuqgil6uhghbfgibl9j3ja5/97208989044.pdfIn PDF document text
    • http://novichiha.ru/pic/file/gorulovasifi.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/390ode466jh4q9am6fn5p4lbd3/jubovudasido.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa69c1d228---61433058817.pdfIn PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/kojibofuru.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/0739954dd58aa71bd35d9b72a8a5a9e4/wonegivekulenivo.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081275c8c3a9---jitefuwunoravesi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=kidney+hydronephrosis+causesPDF 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_off0000e6ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6EC 10672 bytes
SHA-256: 3fb715af65477a2b16ee14fb511ef2c1b341789ac7a2476bfaf1a6a92adcf70c
font_01_sfnt_off0000ff4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1