Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fd181a90c4557e5…

MALICIOUS

PDF

70.2 KB Created: 2021-10-01 07:50:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 390926af25f456d2efaa99eab576bffb SHA-1: 1d214cdf84e754f1597f56265cb9a258b612e6d1 SHA-256: 7fd181a90c4557e552f132568635f38162e9307e50b8100d9cc58dad0c0971ec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous external URIs and link farm patterns, suggesting it is designed to redirect users to potentially malicious websites. The presence of compromised CMS upload links further supports its use in distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://laborke.ru/uplcv?utm_term=breathalyzer+app+for+android+phone PDF link annotation
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e59b650d98---24362456140.pdfIn PDF document text
    • http://luatsugiadinhviet.com/upload/ck/files/jerojumosuxol.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16134fa4629284---4635845092.pdfIn PDF document text
    • https://polenhosting.com/calisma2/files/uploads/19514737221.pdfIn PDF document text
    • http://rafaelstore.ru/upload/files/69868326508.pdfIn PDF document text
    • https://at1-turbo-j3t.com/contents/files/turixofurifubigezafumori.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c246349c7b---joloxotuwabur.pdfIn PDF document text
    • http://abwjefferson.com/uploads/files/waludelezifukifavaxexele.pdfIn PDF document text
    • https://rent-1.es/ckfinder/userfiles/files/ralodatofevoluvajoguji.pdfIn PDF document text
    • http://canadianrockies.ca/files/file/gizovudagadisumavuxizovof.pdfIn PDF document text
    • http://villabrown.it/userfiles/files/bokokudekefelogumujixedu.pdfIn PDF document text
    • http://soyaksiesta3.com/userfiles/file/xigulagutixutotorefowak.pdfIn PDF document text
    • https://raiporjai.com/piceditor/file/vegovebekikuvaforuvutetul.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/a3c39aa144a7d9af2ea19249b728f81d/15808065013.pdfIn PDF document text
    • http://tid.vn/upload/files/80023329044.pdfIn PDF document text
    • https://nonbodepsg.com/uploads/files/lemezuvezukagugujak.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/2021929133167134.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d4f468e562---zeterufodo.pdfIn PDF document text
    • https://vkgnassociates.com/dayafter/uploadimages/newsimages/file/17575579559.pdfIn PDF document text
    • http://inica.org/files/file///tilanujevoxe.pdfIn PDF document text
    • http://leebyenghun.com/new/upload/board/files/tobanulifanimofojezi.pdfIn PDF document text
    • https://godahoian.com/app/webroot/upload/files/jedarobosuberiwevix.pdfIn PDF document text
    • http://silarperu.com/UserFiles/file/36089317977.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_off0000b26f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB26F 15836 bytes
SHA-256: f46d35783355c5bc21965d0609ddd7c4831fe3735c805b3e162740e178e97319
font_01_sfnt_off0000da76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA76 10652 bytes
SHA-256: 4f562bc4d875d04a649115fb11bce87aca6383c2c10dc9163c0eea96e6756627
font_02_sfnt_off0000f2d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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