Malicious PDF — malware analysis report

Static analysis result for SHA-256 53b39758b8628bce…

MALICIOUS

PDF

91.4 KB Created: 2021-07-13 02:43:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 49b8ae4b4ba024f9754a1c9280c601ac SHA-1: 2aa065bcceb089efb871c9147c68b4fafc4743a6 SHA-256: 53b39758b8628bce90ec531faec8bd3c4b24a941f2d124bcc7a77a389b5f62fa
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress sites, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier indicate malicious intent, likely to redirect users to malicious content or download further payloads. The presence of embedded URLs and the nature of the links point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5847

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://irlanc.ru/uplcv?utm_term=mac+os+high+sierra+iso+download+for+vmware PDF link annotation
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b1416beaf---divuvene.pdfIn PDF document text
    • http://designerhouse.ru/upload/files/jokoxipa.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607891273ab37---53836428191.pdfIn PDF document text
    • http://artospace.com/pics/file/pidatedakalimavenaro.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/68731476754.pdfIn PDF document text
    • http://nanobubblevietnam.com/uploads/userfiles/file/21392517436.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/56542173222.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/c14m6j0b0g781hjj0ep1d58eo3/xasuperujaguvatura.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/9001fc40d1282d507ec99f26b958db37/dapijeju.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e2a4d4a16a9---waluzarafuf.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1b09335ef1---tisinawokimutapijox.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/qib527g6l4glctt7o0lktun684/xewoso.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16097a4a14e00d---1931591561.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/982693702ec02ec2674dbe78e5f090b5/85666707385.pdfIn PDF document text
    • https://mebelihome.ru/upload_picture/68496830684.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/654ep8kv90jgs8hpr09lj3srch/rosalurizisodaxodasu.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160903b14c3e9a---fidozevadodopokugexexino.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/66b04121cfe2456c5685a576dc2e458f/19844483112.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/78a72bf304ea5eca08ad3773645fa846/dowenowulewis.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/vlb9nrr1bvkp3dhi671oog5i32/46190347305.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607f17dde93df---19859972508.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b791f58af78---tetufivovaxovevanadiz.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/75d8a3cb56bcf598908daac5057cdfdc/susumob.pdfIn PDF document text
    • 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_off00010966.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10966 17100 bytes
SHA-256: bb5a04d46b05d88b947d576a99e4a6e863b4ff2f73d15ece60c3453ae8812291
font_01_sfnt_off000135fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014e11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E11 10968 bytes
SHA-256: 4b21a7c1d7eb4aea60b57687d159ff639a53c94d797db8e451d33015ff64237d