Malicious PDF — malware analysis report

Static analysis result for SHA-256 223c6f6c8ba3442f…

MALICIOUS

PDF

89.1 KB Created: 2021-08-21 11:25:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7712ed7ad5eec9f6da5312a7f8d8d0fd SHA-1: 3ea3484a6a02b48b8ea170dd5d6d1bdd5f830c4c SHA-256: 223c6f6c8ba3442fe96a5e0b4e56e0a718243aab4655896bc6a3eab1318c935b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a phishing or malware distribution scheme. The presence of embedded JavaScript indicates an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://perles-del-beya.com/userfiles/file/17555342416.pdf In PDF document text
    • https://aprenda-atdi.com/uploads/files/pifarinizumobig.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/e2b02f38db2694eda508d7a2579a8aa3/vuvazawoxofakowej.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/89522339375.pdfIn PDF document text
    • http://laros.cz/UserFiles/file/37770284611.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609660cf97465---wigadisedodipevawuderij.pdfIn PDF document text
    • https://vantainoidia.vn/ci/userfiles/files/gotavenil.pdfIn PDF document text
    • http://apisicul.com/userfiles/files/dajunej.pdfIn PDF document text
    • http://vyveva.eu/UserFiles/File/96435175600.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/53fa731b5fddde554dfcd386f79be866/5122048773.pdfIn PDF document text
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/87a992b3d12d824a6e8a319c24190b46/beragekonomixikiwopakufal.pdfIn PDF document text
    • https://silatur.com/js/ckfinder/userfiles/files/wogazazabi.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/42222839446.pdfIn PDF document text
    • http://www.prodomasa.com/ckfinder/userfiles/files/zuvumafikaxese.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/76128440591.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16086077859f9d---borejex.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/33804896155.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac275ec1588---175127624.pdfIn PDF document text
    • https://gilbertems.com/videos/file/sitavisitonifolap.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f8d409bc134---32239136865.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e0f0250f2---98423850999.pdfIn PDF document text
    • http://bora.su/ckfinder/userfiles/files/75345524908.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=similar+figures+review+worksheet+answersPDF 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_off0000f60b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF60B 11080 bytes
SHA-256: 3a43fd53a3544b392c06608db59c4d8fedc917f522b38628dfb5b631c2096fe5
font_01_sfnt_off00010fb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127CB 17560 bytes
SHA-256: 0cdf341563abc0e6f4ee1315955edddb234b77a13a369a63b77962d753f76a83

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