Malicious PDF — malware analysis report

Static analysis result for SHA-256 21974b85a559fd16…

MALICIOUS

PDF

84.5 KB Created: 2021-06-29 03:44:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 2b6bd246d402cd3e6e6e07a94d0d2db3 SHA-1: c51a81c75c5b4dd72329abaf4b70cee0d6b029d2 SHA-256: 21974b85a559fd1634369e7a3f594f96b74fdd2ad61d77b1fdc736107ffdce4c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to multiple domains, some of which are hosted on compromised CMS uploads, suggesting an attempt to distribute further malicious content or conduct phishing. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://srihemkuntschoolint.com/slbdavbatala/userfiles/file/97714031593.pdf In PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/wemejiwanirosadawo.pdfIn PDF document text
    • http://blessingsngo.in/userfiles/files/linobipozadogolunav.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/2c3a6c19d11c02228f8e7781b7a6207a/rizis.pdfIn PDF document text
    • http://arserwood.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210519145007657683rr1o2n.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607a81827cfb6---dagax.pdfIn PDF document text
    • https://baongochoa.com/upload/file/gevuwu.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609668d063bd0---16819098501.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/130887936160b6b982a8773.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/bp6j7k8h49vb8l8f9g4v8eno47/93994829164.pdfIn PDF document text
    • http://taeguektour.com/FileData/ckfinder/files/20210531_438600585B8D2919.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16071977c700ee---49649691028.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/7b1e15e43b6e4d7d6da6fca5737fe021/15194195543.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/357acac52f77f8db14b80fc5e1987964/27892404303.pdfIn PDF document text
    • http://stpatricksreunion.org/clients/84553/File/81033089098.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/003a9634ca9cdd70cbb5d5f45bfe90e6/68513382746.pdfIn PDF document text
    • http://katachizu.com/img/news/files/nibenavuji.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/worapizibekefaliw.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608816d1e09fa---6542320103.pdfIn PDF document text
    • http://decamiones.com/userfiles/file/kuvesogo.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160baafcf49066---28483642616.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/285719ed4b27b6affff7beda02b2467f/49499048998.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e6a14e7b9c---nonisaverumekoruderaxomaj.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/jivavatitexa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=the+road+not+taken+historyPDF 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_off0000e9bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BD 16660 bytes
SHA-256: 9d037011129552e1bb782805ae82d59eaecdd504298a14bc4cf4fbb4d138c23a
font_01_sfnt_off00011519.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11519 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D30 10468 bytes
SHA-256: c44e78b7e087ae26f91855f7fbeafd000c75fc0109d742d0bcac3c4839eeb0b9

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