Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f04435bb4fdcf20…

MALICIOUS

PDF

85.8 KB Created: 2021-09-01 05:54:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 91b0ff77c06acf2fb612a6819f2f6023 SHA-1: 3fb48144fd6ec0013b1e7672ea60547860266d49 SHA-256: 2f04435bb4fdcf205d46419dc5798328528b29e7d6633964c7591a68df7fffcd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and a link farm pointing to multiple distinct hosts, indicating an attempt to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is a phishing or malware distribution vehicle. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://china-engine.net/ckfinder/userfiles/files/dofulofidivovavuradovup.pdf In PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/627fd5215a01f5bb76d6722027a22c27/7683702706.pdfIn PDF document text
    • http://yule-sign.com/upload/editor/file/20210624202749.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1968ba00a---lupim.pdfIn PDF document text
    • http://em-mould.com/ckfinder/userfiles/files/rerudi.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d1cde5012e---bedajozobebiroregoresi.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16090c7deb7bf0---38349481233.pdfIn PDF document text
    • https://www.barefoothoa.com/webroot/js/ckfinder/userfiles/files/ludowawupojobitufis.pdfIn PDF document text
    • http://dailythang.com/userfiles/files/xidar.pdfIn PDF document text
    • https://berbagiangka.com/contents//files/rawibo.pdfIn PDF document text
    • http://thestarbusan.com/FileData/ckfinder/files/20210710_FFC2DDAA9774D07C.pdfIn PDF document text
    • http://sun-dr.com/uploads//files/202108111932049649.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a3d3646b8b---basimifonaxesetiwemizexa.pdfIn PDF document text
    • https://arerp.kr/data/file///62254127765.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16085498a8b942---11040056159.pdfIn PDF document text
    • http://doubles301.jp/files/ckeditor/files/fagefipeliwijebov.pdfIn PDF document text
    • http://cyuanmei.com/userfiles/file/8779016220.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/ddd0ad3c8188bf0cb1a249884506dcb6/vepuxomefaw.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/valokonawusezibaxajita.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160b88be4e58db---73087150977.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/202184145444548.pdfIn PDF document text
    • http://kasystemofkarate.com/clients/861259/File/5905519778.pdfIn PDF document text
    • https://linlinline.biz/js/ckfinder/userfiles/files/valovipijutix.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/b3a06b1badc9441dd5aea9d69188a1a0/53880710874.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16082fda45b362---burezubilapoz.pdfIn PDF document text
    • http://perfekttorun.pl/pliki/7780661445.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=magic+school+bus+all+dried+upPDF 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_off0000e847.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE847 10824 bytes
SHA-256: 40274c7e52d943f093ed2e3a047fbf749d7683a38baa78e70b98aa681718372f
font_01_sfnt_off000100e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E1 17724 bytes
SHA-256: 20357baf3629769f5263502b1c25cd05d7cc7113e289cb783268d0fb5031ed2a
font_02_sfnt_off00012efb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1