Malicious PDF — malware analysis report

Static analysis result for SHA-256 06689d93affe4b4e…

MALICIOUS

PDF

69.9 KB Created: 2021-09-06 20:54:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6e46f43b5fdd8afd0012886d1d885880 SHA-1: 324800a03fa49202597e70362e3bb1776fd47e26 SHA-256: 06689d93affe4b4ed8d53cdfb40072c1f048830ff835dd205cf91e9c18dc7b25
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to other PDF files hosted on various domains. Heuristics indicate a 'link farm' pattern, suggesting the document's primary purpose is to redirect users to external content. ClamAV detected this file as 'Pdf.Phishing.Trojan', and the ML classifier also flagged it as malicious, supporting the assessment of a malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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 http://adas-muko.pl/photo/file/vedosox.pdf In PDF document text
    • http://ikoi-es.club/yamituki-n/uploads/files/nutujutevibodu.pdfIn PDF document text
    • http://btc-ltd.com/upload/file/60767153137.pdfIn PDF document text
    • http://majortaylorride.info/images/uploaded/file/vebibaziluxenaxunanija.pdfIn PDF document text
    • https://apteka-wratislavia.pl/halatecza/userfiles/file/15244148663.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/94700194544.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160866d7b3ff56---wudilunuxizabewev.pdfIn PDF document text
    • http://signexpowholesale.com/project-new/christianbook/upload_images/file/misagamexemorefufuk.pdfIn PDF document text
    • http://proxkimya.com/resimler/files/83284775463.pdfIn PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/16209166928674.pdfIn PDF document text
    • https://sanxuattrucauthangkinh.com/Images_upload/files/weboxumubuvabowejevejenu.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/rpi0jeo7fdg9h29u6401jvv48o/serunisofafolenofabos.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161029cdf92cb6---dekirikopubijofugeja.pdfIn PDF document text
    • http://manu-transport.com/documents/file/9931702018.pdfIn PDF document text
    • http://nuitsdartistes.eu/images/file/34245283116.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/3ufpg4p0bsnhr5397ucp5j3gro/furukuzaxokemaforija.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/bd70412352de0ea53b5b070d44852b48/31155104964.pdfIn PDF document text
    • https://davidfoleyinc.com/userfiles/file/nuwazuzu.pdfIn PDF document text
    • https://honghow.com/ckfinder/userfiles/files/lepowufigimefir.pdfIn PDF document text
    • https://bishopsalamatkhokhar.org/userfiles/file/83310378502.pdfIn PDF document text
    • https://atlantidegattico.it/file/nexisamumo.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/fawojumavolizelo.pdfIn PDF document text
    • http://scsytech.com/upload/files/92204382940.pdfIn PDF document text
    • http://yuqiaohome.com/uploads/files/202108212342311423.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160fe49a5753e1---83559437808.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=nested+for+loop+in+c+programming+example+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_off0000b43a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB43A 11040 bytes
SHA-256: 8370c59bc654fbdd99015bb00351c20ce6cbccc4a1df43abf02e206ff8e675d7
font_01_sfnt_off0000cdbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e5ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5CE 14472 bytes
SHA-256: ed6c9b5c3fb8e38de224a748e04df48f099bd300f5e436a17f395466ae64991c

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