Malicious PDF — malware analysis report

Static analysis result for SHA-256 20ca6581a30d05fa…

MALICIOUS

PDF

89.9 KB Created: 2021-06-26 02:58:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ce71d3b2b76f1162941fa6e00355f47c SHA-1: 30b38164e992e2e673393996b51a0e6bef8aa06d SHA-256: 20ca6581a30d05fa94a0df2dff1bece16473a6a801172cdaf94a010c06617a2a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to numerous PDF files hosted on compromised WordPress sites, suggesting a phishing or SEO poisoning campaign. The document body is unreadable, but the heuristics indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160cf2ad62086e---37925126632.pdf In PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/aaf35b67fa12f34cee37ba32f36d8eaf/kafodofolelavewipisoz.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/45748534126.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160909f9c79317---85330705393.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/dc67d3ca0093d26d2aee8f51baa6d9d2/59666481458.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607673cfd5bb4---gixubexemixosetufur.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/f6e36d427dd2d61d599c835fcfe7fa99/44281386295.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/e4bde103a9fa36792d699678cea962da/sumixiliredugilik.pdfIn PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/24610106477.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608f73a90d1f0---80808078038.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091aa4532419---katanixodoruduzogepil.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/suu3088c3qqg9cts6h4a0m8083/peledumiwut.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/b0aebb8fb15c1d4ddbc31dd290f5e4e5/42471546007.pdfIn PDF document text
    • http://snsi.jp/image/news_file/sejuzufakefavikipamidel.pdfIn PDF document text
    • https://ises.ca/phpsites/vertical_living/uploads/file/wifajulanejemeziris.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021050909343773499.pdfIn PDF document text
    • http://biomisszio.hu/tmp/37245008995.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/160d5132ae15f7---geper.pdfIn PDF document text
    • http://immobilieninvestors.de/userfiles/file/41472776368.pdfIn PDF document text
    • http://esthebel.de/userfiles/file/tulexulofupipiseleteloz.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/56f61357a8f408375c6bf82cd3261cff/50090332899.pdfIn PDF document text
    • http://yuha.be/_files/file/mitujatejukaseguzikiwin.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2987cf4f1---gamajajawebijulije.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/b6bcfc0832c2237971f8e40d525f8625/nigamago.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/12090157257.pdfIn PDF document text
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/feace62f5b7c8a2e1b3b9c367a01481e/83326411128.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=felicity+kendal+the+good+lifePDF 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_off0000fb1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1B 17420 bytes
SHA-256: 0491e9f43b42bf92309cb638d2946f37b16ea342e7e57f3771c4005e823b2a5c
font_01_sfnt_off00012858.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12858 10668 bytes
SHA-256: e08d0e7ba3e416d198e5d0aa3838931f5d183c3b0a9265997d54f820c213486b
font_02_sfnt_off00014082.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14082 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1