Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc50628bb72a6bbb…

MALICIOUS

PDF

81.8 KB Created: 2021-09-23 12:37:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ed4a67f9c7d966a92b798ad7b0ef286b SHA-1: a3aa736972baa1128b0d8c36502447838da61ab2 SHA-256: fc50628bb72a6bbb9877b22b0c398ff2dcaf84930c2ea5b713b597496df567fc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised CMS uploads and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to trick users into downloading further malware or visiting malicious sites by masquerading as a software update.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://crewmak.ru/uplcv?utm_term=adobe+flash+for+android+download+free PDF link annotation
    • http://capthepcongtrinh.com/uploads/news/files/51431733754.pdfIn PDF document text
    • http://zxpgw.com/userfiles/file/kiwudowuguwujutewujumo.pdfIn PDF document text
    • http://veoguidecostarica.com/ci/userfiles/files/dibukudesepilaruwod.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/161438509d82c9---juvowaleweb.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eb44abf857---42604208935.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/161327348188a7---detomedoribinif.pdfIn PDF document text
    • http://velo.hu/UserFiles/file/wuwozilawevuxi.pdfIn PDF document text
    • https://prestinieurope.com/userfiles/files/vakijejotix.pdfIn PDF document text
    • https://francoisdaulte.com/ckfinder/userfiles/files/92509670927.pdfIn PDF document text
    • http://vinhhangvien.com/upload/files/73035988348.pdfIn PDF document text
    • https://we-plus.tw/ckfinder/userfiles/files/42812598179.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/161477a00412e4---nukozexelesiju.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/161454d4947db9---58720402516.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/55279876187.pdfIn PDF document text
    • http://gfk-schwimmbad.de/i/File/sunumarewizubufopij.pdfIn PDF document text
    • http://briztravel.com/upload/files/32022136435.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614a06bcc53ef---26033071583.pdfIn PDF document text
    • http://uco-kampen.com/media/files/48678704763.pdfIn PDF document text
    • http://argyleliquidations.com/userfiles/files/nemekepubitewanazemop.pdfIn PDF document text
    • http://lexus-custom.com/js/upload/files/kuvutenipazugexez.pdfIn PDF document text
    • http://advocaatindex.nl/images/uploads/berosarawave.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/bolopamatolazejaxijevu.pdfIn PDF document text
    • http://xn--nellieskche-0hb.de/userfiles/file/5232482105.pdfIn PDF document text
    • https://nabijdefossa.nl/upload/files/59705018257.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_off0000dcc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D8 10560 bytes
SHA-256: 68ffae05a10c90cde11f2382cafbf7792cc2e9990a024cde02a7c717fcc9d440
font_02_sfnt_off00010ce8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE8 17184 bytes
SHA-256: b5464849d99c6dc9af67d77a7d3ab4843dd02354c7bc555b0043dad0a6e802b7

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