Malicious PDF — malware analysis report

Static analysis result for SHA-256 e65da173e327cc5d…

MALICIOUS

PDF

85.0 KB Created: 2021-09-07 02:08:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 018beb54319dff3a1a7586058b45a48a SHA-1: 73f09285a70f3b82ec390aa721adaca228001afd SHA-256: e65da173e327cc5d770822b6b2360ecdfa6513ab3f291a1f81be7e231eca4384
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 this is a link farm, likely intended to direct users to malicious content or phishing sites. ClamAV detection and ML classification strongly suggest malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://alexanderjamesbackcatalogue.com/userfiles/file/2410031137.pdf In PDF document text
    • http://vanillasky-ch.com/images/files/43160662178.pdfIn PDF document text
    • http://thrifty-uy.com/files/others/33094378470.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d375cacc4fd---kefejaxanurovemaz.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/8ad5273cc5f804ee7cf3272999e90ca5/84596967725.pdfIn PDF document text
    • http://euro520.net/userfiles/file/16290589012025025807.pdfIn PDF document text
    • http://italiancousins.net/clients/5/54/54f3d33123424807706abe9154268524/File/dunopuredajivimewoxewub.pdfIn PDF document text
    • http://itkaufmann.com/images/fckimages/file/66589942981.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160e4885f2005a---xurisatibiwuxovonifu.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/28047975079.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071b1db6936a---60083860821.pdfIn PDF document text
    • https://langumeistras.lt/i/File/mirekazisetezogodegol.pdfIn PDF document text
    • http://sunmoon-glory.com/web/upload/files/78216328071.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160969d87e4a44---gaxofuwo.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075fe41f2e26---nasisibiriberadunamid.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fb27a676eb---45830883548.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/5aa0dd8bbcf8f2a7eb631f9b04185619/78256852633.pdfIn PDF document text
    • https://economiadecomunion.com/ckfinder/userfiles/files/ginaxidenewusuve.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/e948fb3df95c9ae46e6f5613eaa7611c/suxuruxofirutemepiv.pdfIn PDF document text
    • http://nontaromclinic.com/ckfinder/userfiles/files/zarewirefu.pdfIn PDF document text
    • http://sdds.be/userfiles/file/67363533655.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/20gqd1vc1651m1l096a51f5oi0/nugujuliw.pdfIn PDF document text
    • http://pizzeriagiganti.ro/imagini_ws/34867670329.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/dkd3n23jj41soc8ema8qddlarh/peferumizasogexusut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=libros+juveniles+pdf+gratisPDF 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_off0000e1d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D1 19704 bytes
SHA-256: 6d02a227b75fb09a3e937ed6e2d8ac2e5a148fba0174e65460ba46d5db8f771f
font_01_sfnt_off000114a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012cbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CBB 11068 bytes
SHA-256: dac68f9cdcc434d26e60fcac2bafdacf8b1b9739dc46eab73b2df8f42d1323f8

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