Malicious PDF — malware analysis report

Static analysis result for SHA-256 265882ccd9b2caf6…

MALICIOUS

PDF

81.4 KB Created: 2021-09-13 20:14:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: aa2d255bf9d03d5921094cd2a6b39eea SHA-1: aaae3e79c93fd2bf1f117d87e35d2d91ad414adb SHA-256: 265882ccd9b2caf6ce9e995f48f2a1a5efb1d76aa7db76ccc576410dad47e81b
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and a machine learning classifier. It contains embedded JavaScript and a large number of external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm or phishing lure. The primary goal appears to be directing users to malicious websites, potentially for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://gimnazjum-krasiczyn.pl/img/userfiles/file/67563413300.pdf In PDF document text
    • https://www.info-service.com.tw/plugin/ckeditor/ckfinder/userfiles/files/53569296542.pdfIn PDF document text
    • http://zenithmetals.com/files/43028955618.pdfIn PDF document text
    • https://ecoolteh.eu/galeria/file/62000579400.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613487a5194e2---84602070825.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7dbc39f12---25815461984.pdfIn PDF document text
    • http://lawyermo.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zutaf.pdfIn PDF document text
    • https://www.agro-zavod.ru/app/webroot/js/ckfinder/userfiles/files/xipuvikagogozomipavogim.pdfIn PDF document text
    • http://mebelhotel.ru/images/news/file/62321392298.pdfIn PDF document text
    • http://belean.pl/userfiles/file/10193886878.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f4d0046cbb---debexefikovomorudi.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613686ef0f04c---serededajurufif.pdfIn PDF document text
    • https://suacuacuontoanphat.com/upload/files/sapawow.pdfIn PDF document text
    • http://aisne.proximeo.com/ckfinder/userfiles/files/wuvidotutux.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a13f5cbebe---mepivejixewibezofed.pdfIn PDF document text
    • https://ymy-tea.tw/upload/files/38157126010.pdfIn PDF document text
    • https://tideandtigers.com/ckfinder/userfiles/files/59821093686.pdfIn PDF document text
    • http://bortran.com/upload/image/file/20210908124513.pdfIn PDF document text
    • http://dui-antidote.net/images/userfiles/file/5899075195.pdfIn PDF document text
    • https://sukhayurveda.in/userfiles/file/datuvodewa.pdfIn PDF document text
    • https://themis-lex.com/userfiles/files/rovipefebufofepuvogiben.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/jipedemimewon.pdfIn PDF document text
    • http://xn--b1amishc2fb.xn--p1ai/ckfinder/userfiles/files/4625884562.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/7010fa84096c8ab8c4f7f5a3c809f307/37859249804.pdfIn PDF document text
    • http://wtmongolia.com/materials/file/kubosaxawigome.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=gta+san+andreas+cleo+mod+pc+downloadPDF 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_off0000d847.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD847 10708 bytes
SHA-256: 43bba123e12a976a4013b31c57f533f1ea76d0bb198fb67a05bdbf243e162876
font_01_sfnt_off0000f0f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010905.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10905 18104 bytes
SHA-256: 47508825229b7caed5be1054c8036003acfbcae2bab10a0ac278fa092c6ae7d7

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