Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f5c4a6f2390fd14…

MALICIOUS

PDF

72.5 KB Created: 2021-09-01 07:54:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 59ab904573bd6f7a56c500849b72661b SHA-1: 6fa0750b38c5787d2ec11a505882316cd25a96f9 SHA-256: 8f5c4a6f2390fd14ba493a0d83ef713b7ffc4562b6836fcffd96bb4068541e52
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure indicate an attempt to exploit users through deceptive links, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://allytemp.ru/uplcv?utm_term=how+to+change+a+ballast+in+a+fluorescent+light PDF link annotation
    • https://renault-service.com/userfiles/fubipesaneva.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/8177fe63591660a8cc85a03b10c830bb/vinolixivefidavajujanufi.pdfIn PDF document text
    • https://livredart.com/ckfinder/userfiles/files/88167097987.pdfIn PDF document text
    • http://www.sname.org.tw/sname/ckfinder/userfiles/files/xosib.pdfIn PDF document text
    • http://attlas.center/userfiles/file/vulaser.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16083b2b3c80c1---fagatadekakamogasopidew.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/mokupamemirogegosoduxo.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/dodolitamifizuda.pdfIn PDF document text
    • http://mecaniquekd.ca/upload/file/vewitelapire.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/38428494760.pdfIn PDF document text
    • http://www.ekoforte.com/upload/file/leviduzudoxiso.pdfIn PDF document text
    • http://footstepfloor.com/upfiles/files/luvowoled.pdfIn PDF document text
    • http://asfalon.com/__files/file/dojevusuvusuvot.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/16078a677af7ea---lakudaropigixiwulas.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/a83212bb51228c086def4517b1c8a0bf/darajipizepidesutawuzor.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea2791fd1f---wudegumeguk.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/deca311ac553dceebc05692f078cccb0/nademu.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a56f70379---67658771782.pdfIn PDF document text
    • https://home-consult.lu/userfiles/files/nabelepif.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/64b530a8bb18393248be510c5a0f8cf0/76090175736.pdfIn PDF document text
    • http://yoron.net/up/files/kosoli.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/4nau5il1ag1m7kmkn59n702h32/sodunenurobadoso.pdfIn PDF document text
    • http://utpcomp.ru/uploads/files/xelufaxizilumijupiwidodan.pdfIn PDF document text
    • http://mobilephleb.com/clients/2/2d/2d2188d13063160162e6e2bbcdac547d/File/vojaxuwekota.pdfIn PDF document text
    • http://www.radiooro.com.mx/media/images/uploads/files/xowezedasixap.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In 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_off0000bcda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCDA 15188 bytes
SHA-256: 21352d358922744670d3666dd02534f1f19c9f5c4e68bd34c45275b3cce86cd4
font_01_sfnt_off0000e29b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE29B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fab2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB2 10932 bytes
SHA-256: cbc0ae2401bcc3e16c31cc88bc615d3bb3612da1fba186b526955162274f503c

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