Malicious PDF — malware analysis report

Static analysis result for SHA-256 61a90f97e8c9410a…

MALICIOUS

PDF

81.4 KB Created: 2021-09-19 03:46:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b10325a37b649413bfe10aae1ce5d650 SHA-1: c59aab7ce655a83c14cc924b374d992a7c6b0e94 SHA-256: 61a90f97e8c9410a615a94158ad4d11d886dbf2f35e8202e01ab5aa4993a09e0
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It functions as a link farm, with numerous URLs pointing to various domains, including those hosted on compromised CMS platforms. These links likely serve as lures for phishing attacks or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • 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://infrive.ru/uplcv?utm_term=rick+last+episode+walking+dead PDF link annotation
    • http://odessawa.com/userfiles/file/60752840223.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/161450e3a52d17---87896117619.pdfIn PDF document text
    • http://velocimapper.com/webfiles/file/siwilanovegasopuxi.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/98047714818.pdfIn PDF document text
    • http://oa30us.com/userfiles/file/zunazabalikowoxuje.pdfIn PDF document text
    • https://megalightgroup.lv/uploads/files/69736603472.pdfIn PDF document text
    • http://teamtrinity.net/trinitya/file/62400777141.pdfIn PDF document text
    • http://tksvolga.ru/userfiles/file/jalivutuvoz.pdfIn PDF document text
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zozafefilulojekaputexaroj.pdfIn PDF document text
    • http://weighlessthisyear.com/ckfinder/userfiles/files/97186263470.pdfIn PDF document text
    • http://health-bridge.in/upload/file/16579374962.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/161303ffa69acd---43562911920.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/digepadaselu.pdfIn PDF document text
    • https://resortweeks.pro/userfiles/file/xitapadukovokezixatujag.pdfIn PDF document text
    • https://henseltech.cz/userfiles/file/94887982553.pdfIn PDF document text
    • http://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/d0347da35cf7ccf088eef63582f3822c/66033989265.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/61787931578.pdfIn PDF document text
    • http://noithatsah.com/webroot/img/files/zapefidaponavu.pdfIn PDF document text
    • http://rosabaum.de/web/editor/files/zojobezusizip.pdfIn PDF document text
    • http://talk200.com/admin/admin/uploadfiles/file/87398102775.pdfIn PDF document text
    • http://hondatayho.vn/images/ckeditor/files/44429443021.pdfIn PDF document text
    • http://hstairan.com/FCKeditor/editor/filemanager/connectors/php/userfiles/file/lugun.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_off0000d9bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9BF 10812 bytes
SHA-256: 5baf39a88db71b20d25fd4a5a86f62f4cd8354b8222041a4f618b74e393fb98f
font_01_sfnt_off0000f2b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ac4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC4 17216 bytes
SHA-256: 833cce8360a119c13a46aaacc9e66c9ec443bf5569555e2bf466071db61f06d8