Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f13012b8b2dd5e3…

MALICIOUS

PDF

68.3 KB Created: 2021-10-01 02:25:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 18c04e65a3d0eb3e2bad8251d2809731 SHA-1: 0491892e1d0b52db1e4faf0d781396a5de6412c7 SHA-256: 6f13012b8b2dd5e3dfc06698bcd07950cc61f74f07124270c2f9f40f4bfc3f84
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF exhibits characteristics of a phishing lure, including being image-heavy with minimal text and containing a large number of external links. Several heuristics indicate that these links point to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9851

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://oniceh.ru/uplcv?utm_term=obb+file+installer+apk PDF link annotation
    • http://pdww.ru/ckfinder/userfiles/files/26717189042.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161377f3d56a77---81363948332.pdfIn PDF document text
    • https://endobible.com/userfiles/file/52828451492.pdfIn PDF document text
    • https://tinhhoaxanh.vn/userfiles/file/sijonifesabo.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/7ddeb4a624fae0ff2485ebd481f75ca3/28240622149.pdfIn PDF document text
    • http://smartraoptics.com/fck_filemanager_upload/file/gapejurugalewori.pdfIn PDF document text
    • http://cgpharma.in/cote_dor_import/admin/ckfinder/userfiles/files/60669717247.pdfIn PDF document text
    • https://jin-ji.com/upload/files/fixududaditufijaki.pdfIn PDF document text
    • https://gujaratisamajparis.org/upload/files/82003815789.pdfIn PDF document text
    • https://abriganature.centralcms.cloud/galeria/files/16441320757.pdfIn PDF document text
    • http://zekejozsef.eu/FCKfeltoltott/file/2200717024.pdfIn PDF document text
    • https://marlin-aquarium.ru/ckfinder/userfiles/files/votejobafimenerazateg.pdfIn PDF document text
    • http://agecarekorea.com/ckupload/files/jupodabilomijusudirun.pdfIn PDF document text
    • http://kidzcastleschool.com/singhania/downloads/file/fuxomuxevivinidefagiro.pdfIn PDF document text
    • http://www.pics4us.de/userfiles/file/39675387087.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/352380214.pdfIn PDF document text
    • http://tehla.eu/userfiles/file/55264948395.pdfIn PDF document text
    • http://ngocphuocjsc.com/public/default/ckeditor/files/rogibemolukoxejulisibunep.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/60642627fc4029e2ba2750b76f252761/46642476071.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/16132827bba99e---45855202564.pdfIn PDF document text
    • https://www.q-jin.ne.jp/ckfinder/userfiles/files/2419661552.pdfIn PDF document text
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/55928314491.pdfIn PDF document text
    • https://remini.hu/userfiles/file/55708272210.pdfIn PDF document text
    • http://carrasvilla.es/uploads/files/54527997926.pdfIn PDF document text
    • https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/zelarapukep.pdfIn PDF document text
    • http://archetipoingegneria.it/userfiles/files/46331958037.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_off0000b092.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB092 14280 bytes
SHA-256: 9cb214bc82cd1ea84985ba7392216c0c8ef77a4945083ccfafdfd96d70ae50c2
font_01_sfnt_off0000d418.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD418 10488 bytes
SHA-256: 26b6ddf099869d270e9ec6ccb557432f610ab01b4cfbfb1baf1594f786e3d0c8
font_02_sfnt_off0000ebe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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