Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ebe0c1cb7e90eca…

MALICIOUS

PDF

76.6 KB Created: 2021-09-25 20:59:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: fcbfe517ca854d97ca68c2fecb988e3c SHA-1: fbfe45d5398efe8cd2bdc5a6e7423410489518d4 SHA-256: 8ebe0c1cb7e90ecaeb6005b89d4a59380d0154fd6c92482880fadb5124050d9b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to other PDF files hosted on compromised or disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest a link farm designed to obscure the true destination or host malicious content. The embedded JavaScript, while not fully analyzed due to obfuscation, is a common vector for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://fsf-vastroad.com/userfiles/file/bexesa.pdf In PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16147779de1f34---12922456370.pdfIn PDF document text
    • https://miltonmattox.com/userfiles/file/38916309839.pdfIn PDF document text
    • http://ceroki.com/image/files/96596214779.pdfIn PDF document text
    • https://ijacr.net/assets_admin/ckfinder/core/connector/php/uploads/files/lanimer.pdfIn PDF document text
    • http://erictex.com/ufiles/files/9646851775.pdfIn PDF document text
    • http://grandrosso.com/js/upload/files/jaxewevi.pdfIn PDF document text
    • http://chingyi.tw/userfiles/files/lilimagiv.pdfIn PDF document text
    • http://geometramaurotozzi.it/userfiles/files/tigakabupeji.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/11113870099.pdfIn PDF document text
    • http://moto-bike.pl/userfiles/file/60915957564.pdfIn PDF document text
    • http://colokit.thienlonggroup.com/Images_upload/files/30756979792.pdfIn PDF document text
    • https://trongtrucsolution.com/uploads/files/pusurutaseraka.pdfIn PDF document text
    • https://albertscience.com/ckfinder/userfiles/files/sikezubavi.pdfIn PDF document text
    • https://matao.ro/app/webroot/files/userfiles/files/damejogebuvu.pdfIn PDF document text
    • https://tmtteks.com/files/79057653100.pdfIn PDF document text
    • http://berbun.com/user_img/file/gasamugedawanasesotaj.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132e86ce9459---1640668513.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/97448104214.pdfIn PDF document text
    • http://krr-nfe.com/suratnfe/UserFiles/File/dexin.pdfIn PDF document text
    • https://marlschuz.com/userfiles/files/53238973132.pdfIn PDF document text
    • https://congtydaihai.com/upload/files/64648213929.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/54d3e6d4f51817781c3f09e4a2898c57/8284374510.pdfIn PDF document text
    • https://vibangthuaphatlai.net/uploads/files/xixogoxikebimepitoxeki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=letter+g+fonts+copy+and+pastePDF 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_off0000be88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE88 10728 bytes
SHA-256: 5a9d8d3fe0161e2af38e6d81d32572f2a5a45b92aead5ba4ed8aa87a62eae7af
font_01_sfnt_off0000d727.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD727 20192 bytes
SHA-256: 323de91289c0b89fb131dcfa3572b327923989e8145f2cbb1d7666264a159f31
font_02_sfnt_off00010ae9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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