Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ed02c98aa4076cd…

MALICIOUS

PDF

70.6 KB Created: 2021-09-26 10:56:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d24022feb38ad55f0c7a361c3d116149 SHA-1: 7ce5dcb98a7da44171bddf7ffd7cbb20d059e9cc SHA-256: 8ed02c98aa4076cdfc97ad43d675922ceb32ef49cbffbd09660c4d67d5bb4ed9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous links to external websites, many of which are hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://sunnyvale.com/wysiwygfiles/file/51008452669.pdf In PDF document text
    • https://self-storage.sg/images/uploadedimages/file/xewoluremisakibosedoguju.pdfIn PDF document text
    • http://archiwum.wyryki.eu/admin/ckfinder/userfiles/files/sijafugiwubojezow.pdfIn PDF document text
    • https://perfectsextherapy.com/public_html/userfiles/file/45796493177.pdfIn PDF document text
    • http://hoya-system.com/uploads/files/202109051645003785.pdfIn PDF document text
    • http://escalierdurire.fr/ckfinder/userfiles/files/nivate.pdfIn PDF document text
    • https://jaurrieta.net/USERFILES_JAURRIETA/files/81147554995.pdfIn PDF document text
    • http://www.cerathai.com/image/upload/File/rewudawovijap.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/161434f706ff68---5597059331.pdfIn PDF document text
    • https://portalbime.com/UploadedFiles/New/file/16725720866.pdfIn PDF document text
    • http://dalnoboy.net/data/filestorage/upload/files/89509247415.pdfIn PDF document text
    • http://3t-t.com/User_File/UpFile/file/20210918210317_MjE3NTM0NDY5MDI=.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134ec6b4cde0---surebuwiruxevuki.pdfIn PDF document text
    • http://cherryontop.pl/upload/fotki/file/71952720935.pdfIn PDF document text
    • http://avatars.ru/userfiles/file/furuludiwufodom.pdfIn PDF document text
    • https://lenaoyunlar.com/calisma2/files/uploads/74401655484.pdfIn PDF document text
    • http://battlegrouponline.com/app/webroot/js/ckfinder/userfiles/files/xijirevawekipaxubekid.pdfIn PDF document text
    • http://villalapinetafavignana.it/userfiles/files/ripaxabajolutedijuboz.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130b2a50606e---1218108987.pdfIn PDF document text
    • https://a-pointpro.com/cms/ckfinder/userfiles/files/mamotemanadog.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/5800158327.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/vajetumezojelarurekiwofen.pdfIn PDF document text
    • https://betentour.com/sites/default/files/file/sufenubune.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=2021+prime+or+compositePDF 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_off0000b119.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB119 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c930.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC930 10420 bytes
SHA-256: 4657f73f439f1b3e3f9dd721b8960231b37bd7c856005fed2ca566b0a61608dc
font_02_sfnt_off0000e0e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E3 17324 bytes
SHA-256: 7857ad2b37b34ae6748d26f6876137e28421124242d28ea0a0698c6bcaede24d