Malicious PDF — malware analysis report

Static analysis result for SHA-256 9894b8412f801237…

MALICIOUS

PDF

85.5 KB Created: 2021-06-28 03:21:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: fd072e44e64543d560608dbc2a8dee3c SHA-1: 18a1b39c63c6cf1f4aaa24057fc9f848b654cacf SHA-256: 9894b8412f8012370b99eca18d18d212177420d169a4324e5cec31f058c01bc8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and a large number of external links, many pointing to compromised or disposable hosting. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a link farm designed to manipulate search engine results or direct users to malicious content. The embedded JavaScript likely facilitates the redirection or further payload delivery, contributing to a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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 https://willmarlakesarea2040.com/ckfinder/userfiles/files/weputiromubawugowixox.pdf In PDF document text
    • http://fine-cottage.ru/userfiles/files/nadoxe.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/453e5d6c9b624a614f9faf5dd496b940/linesiriginiraledasarij.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/gufekuvekekabi.pdfIn PDF document text
    • http://stitesattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/95502494692.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aaffbddf3b---22723230718.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c347dcd24d---43739167827.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/5d44c2055de7d247227345ba28fa017d/rowutixalax.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/mugujako.pdfIn PDF document text
    • http://arserwood.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210518075311152301zw98ss.pdfIn PDF document text
    • http://bazis-expertiza.ru/ckfinder/core/connector/php/files/32873926811.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/743444cc467acacdb128109ae7a89ab5/22218409933.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/rajemux.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e339d9c045---42869265861.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/jace02c54p5evg7fgob2jqjfg7/nokalifotuzogebexazuxa.pdfIn PDF document text
    • http://beepost.vn/upload/userfiles/files/sosanupowej.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160721c9269f13---10350627136.pdfIn PDF document text
    • http://ahsaipu.com/v15/Upload/file/20214291431253930.pdfIn PDF document text
    • https://hfbee.tw/upload/ckfinder_temp/files/20210625201027.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/hhhrh1gbqsgha136rmsgjfbgs7/xafigofudubibufojebopuke.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/1145168246.pdfIn PDF document text
    • http://dancephoto.ru/userfiles/files/gored.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/ledoba.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/45a59a7b3f97e76f7a6e30d1da68deff/28696312896.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b7f8eb21603---loviw.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/semulugegatabuwip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=shadow+boxing+with+glovesPDF 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_off0000ea19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001022b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1022B 17420 bytes
SHA-256: 0fb139ca7872192b7d0f2d455f652d05f5d7dadd2f012f0b9dd658e696ab137c
font_02_sfnt_off00012faa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FAA 10896 bytes
SHA-256: 17f0d2830852838cd6244d153596ea9ee50d667d4a61abe4b1b15d0a028ae037