Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5c14d710018ffa1…

MALICIOUS

PDF

72.0 KB Created: 2021-09-20 10:31:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f39e9a16fc20f2721420514388944c76 SHA-1: bad8cfbb4cdacb7e304b20a59d0c4756c74f879e SHA-256: f5c14d710018ffa18f4cc13bb570db9effe5976ca1871b706569b657de41e33e
156 Risk Score

Malware Insights

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

The PDF contains a link farm heuristic, indicating it directs users to multiple external URLs. Several of these URLs point to compromised CMS upload directories, suggesting a phishing or malware distribution scheme. ClamAV also detected this file as Pdf.Phishing.Trojan, further supporting its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://darshanam.com/ckfinder/userfiles/files/poxilubenir.pdf In PDF document text
    • http://bronnicy.inhome360.ru/admin/ckfinder/userfiles/files/93813558675.pdfIn PDF document text
    • http://fanta-life.com/userfiles/file/76516781562.pdfIn PDF document text
    • http://miwon.com.vn/app/webroot/uploads/files/zapotomorulakewa.pdfIn PDF document text
    • http://lineshare.net/upload/files/20210907225811.pdfIn PDF document text
    • http://www.somdattabasu.com/fckimages/file/donaposozuwe.pdfIn PDF document text
    • http://fjzy18.com/image/uload/files/bazibafuxurekan.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16147ddb169d0f---78623510844.pdfIn PDF document text
    • https://www.fishhabitatnetwork.com.au/application/third_party/ckfinder/userfiles/files/19498873614.pdfIn PDF document text
    • https://helices-evra.com/userfiles/file/75922546882.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/834b7f7c2595b6612d61792f9e40a7bd/mugemonurajevenofajitisa.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142b2ad788e2---fuvidafarisopikud.pdfIn PDF document text
    • http://one9five.com/userfiles/files/2358497412.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/04539214f977130f07ac5d80f7d25997/vajidixorapupev.pdfIn PDF document text
    • http://aimic.com/userfiles/file/98809044541.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16133ceda19533---pedetiv.pdfIn PDF document text
    • http://nilesk.com/userfiles/file/63767903193.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613e15603a339---54107781652.pdfIn PDF document text
    • http://kamakuralosgatos.com/uploads/files/mobenuga.pdfIn PDF document text
    • http://0975811252cool.linker.tw/files/81584766513.pdfIn PDF document text
    • https://bczenekar.hu/files/file/87033303103.pdfIn PDF document text
    • http://www.psoealora.es/ckfinder/userfiles/files/mimagekanuwen.pdfIn PDF document text
    • http://jungvassar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nigexesakozaxewotefolujo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=what+is+doc+docx+pdfPDF link annotation
    • 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_off0000b856.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB856 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d068.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD068 16580 bytes
SHA-256: b38462933733a9455ea03cc5c5a349a61efb8e9ff355dabdaac892de31903ef5
font_02_sfnt_off0000faf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF8 10432 bytes
SHA-256: dc30fcb7bce00df3cc6b5c6fb97952379bb376ece9cc6d7dbf0c3badedea6557

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