Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0a92fa0b6362303…

MALICIOUS

PDF

93.2 KB Created: 2021-10-04 16:29:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d79f0cf6dc352493085d98466c07cb2a SHA-1: a59c659173139ec5d061319891b69e88a9092ca0 SHA-256: c0a92fa0b63623039894e939de61baedc2a3ffddfb0a044d68488c73e1fbc782
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many hosted on compromised or disposable domains, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely involving the execution of JavaScript to facilitate further compromise or redirect to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://allytemp.ru/uplcv?utm_term=ambition+in+life+meaning PDF link annotation
    • http://vertex-decor.com/userfiles/file/golilezefal.pdfIn PDF document text
    • https://tttinox.com/upload/userfiles/files/50375223329.pdfIn PDF document text
    • http://naosgym.com/userfiles/files/25650293210.pdfIn PDF document text
    • https://gretajensen.com/ckfinder/userfiles/files/kalodurejonaletini.pdfIn PDF document text
    • http://granitemountainranch.net/userimages/jeduwukowatobux.pdfIn PDF document text
    • https://www.barrau-philippe-sedeco.fr/ckfinder/userfiles/files/96031183699.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161530ebd59f30---78691006432.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/d0e9009285324f3d85b316db0c23a804/28505083556.pdfIn PDF document text
    • http://xn--80aesyq.xn--p1acf/files/file/jadixababupelatibetew.pdfIn PDF document text
    • https://francoisdaulte.com/ckfinder/userfiles/files/96460739394.pdfIn PDF document text
    • http://dirpub.org/editor/ckfinder/userfiles/files/jefelalapudibabonozapo.pdfIn PDF document text
    • https://finliz.lt/i/File/24611835592.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/likaletufopiliradata.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16133fc959a026---25761844528.pdfIn PDF document text
    • https://hanomanberjaya.com/contents/files/zerakujoxeveza.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/gujibogifoxefokelul.pdfIn PDF document text
    • https://prettygreekvillas.com/admin/fckeditor/editor/filemanager/connectofile/tobaguf.pdfIn PDF document text
    • https://mu3yc792xh-rl1.com/contents/files/sozunedorunesefigefakufo.pdfIn PDF document text
    • http://meuble-tunisie.com/userfiles/file/dotizimuzig.pdfIn PDF document text
    • http://93564497.com/userfiles/14892879175.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/81702114573.pdfIn PDF document text
    • https://successalpha.team/upload/files/gosinixasaliferirit.pdfIn PDF document text
    • https://best-of-geldanlagen.de/userfiles/file/mazevifuxajofupex.pdfIn PDF document text
    • http://unibeauty.com.br/ckfinder/userfiles/files/82311875101.pdfIn PDF document text
    • 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_off0001001d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1001D 21520 bytes
SHA-256: 14475f4ca74b59c34983ca5a885d5aebceeffb2335dfa3e2af4eb66328dc3409
font_01_sfnt_off0001378f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1378F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014fa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FA6 10412 bytes
SHA-256: 398dd21936859552c69456ca224135bef649a0a8421020c263bbf12c4c041e1e