Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bd53c26dadd787a…

MALICIOUS

PDF

73.5 KB Created: 2021-09-06 07:56:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: a57f50ec220b13c791fc8f5223b009b5 SHA-1: 7ff8468ef430eeac4fee83d50a5fbaa98d7126cf SHA-256: 3bd53c26dadd787ab5a1155c4cca15623ed0a69a8efd7e76b7b0cd7296c45848
124 Risk Score

Malware Insights

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

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms. The ClamAV detection and heuristic firings indicate this PDF is designed to lead users to malicious content, likely for phishing or to download further malware. The embedded URLs and link farm structure strongly suggest an intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4734

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.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/74l2t93fgpvb6v40cilea70tvd/61716069666.pdf In PDF document text
    • http://vinhhangvien.com/upload/files/wixogovova.pdfIn PDF document text
    • http://nanobubblevietnam.com/uploads/userfiles/file/wezuk.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3210ddf31---39999703293.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/c0af251ade0107497df7a0656ee64cc5/mekidaleziw.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/4dcbdd913d0e86c4dbb8078cf3ca2502/dojesujipomowovo.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609305b1a0bc5---17019020862.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b18aa929635---69551704904.pdfIn PDF document text
    • http://bizbecho.com/pa/trainstation/uploads/image/file/sudutonazujufogifirexere.pdfIn PDF document text
    • http://www.village-gaulois.org/gestion/ckfinder/userfiles/files/714901851.pdfIn PDF document text
    • http://jucal.es/images/file/jawanidifija.pdfIn PDF document text
    • https://ceccardolj.ro/userfiles/file/64321480654.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c399a799bd5---501478386.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/pas77erid1vdj816kk7djkcmfs/96436096573.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/shuoom2ltimr6dd3eh1q2d058n/midizit.pdfIn PDF document text
    • http://jandenzobv.com/image_uploads/file/dadogojibefevefil.pdfIn PDF document text
    • https://strechybenesov.cz/content/wodowegereni.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f9199561350---nosofuxogutugozise.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/52adf0c7136e5b63d183e9f7e42c6629/gajawavaxurefije.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/44588968543.pdfIn PDF document text
    • http://officeharbor.com/pdtInfo/19960764531.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16090869dd508b---19765478502.pdfIn PDF document text
    • http://archi1919.com/smlclub-files/file/8864462057.pdfIn PDF document text
    • http://szpk.hu/_user/file/mutupe.pdfIn PDF document text
    • http://benhvienlaptop.biz/userfiles/file/gevojavatina.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/akanooglf163d8clbfqginil5a/3481096464.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/juzetigexufobidanedowak.pdfIn PDF document text
    • http://momsystem.ru/public/file/14713541978.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=broadlink+rm+mini+3+black+bean+manualPDF 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_off0000c954.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC954 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e166.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE166 19844 bytes
SHA-256: 28d8dc259581ea2825a8f4b48d9d037870ac9e74e0a7c7a54fa0c6c05cdb9719