Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f98e971bd7f24f7…

MALICIOUS

PDF

69.7 KB Created: 2021-09-27 23:11:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 700502846531e95ab22d7dc87425e58c SHA-1: 362f429dab69d0bdef70e2173fb252410a2e48e8 SHA-256: 8f98e971bd7f24f79c5ec00ec2dd7c54689dc0f3d85ca7bdbf720ec7bc6d3760
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised or disposable domains. These links are likely intended to redirect users to phishing sites or download further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://krisoc.ru/uplcv?utm_term=cops+n+robbers+unlimited+coins+and+gems+2020 PDF link annotation
    • http://ajarnveerapong.com/UserFiles/file/10439142701.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16134a7e4f3ce7---parib.pdfIn PDF document text
    • http://brcassociati.com/userfiles/files/feluzupovapujatud.pdfIn PDF document text
    • https://helicopterleasingservices.com/userfiles/files/jexewakoke.pdfIn PDF document text
    • https://paeonia.ch/userfiles/files/tusafisegomizo.pdfIn PDF document text
    • http://hemeringen.de/ckeditor_ablage/userfiles/files/23671872331.pdfIn PDF document text
    • http://gursakaryahukuk.com/images/file/90750785875.pdfIn PDF document text
    • http://glampingcaravan.com/userfiles/file/20210925200405.pdfIn PDF document text
    • http://biogenetec.tw/image/files/20210919_185935.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/fuxazevepuvoxozegekus.pdfIn PDF document text
    • http://fobosgrunt.ru/files/ckfinder/files/tiwugiwanagufefetanokokin.pdfIn PDF document text
    • http://investgeorgia.ge/userfiles/file/famifejaz.pdfIn PDF document text
    • https://pioneerlift.com/upfiles/editor/files/88085441813.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/fuwerumuzewazetofop.pdfIn PDF document text
    • https://uetty.xyz/js/ckfinder/userfiles/files/jopolukijaluperejexavo.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/q94secif49b6ijj40cti7alpr5/75869213721.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1614dbe2be155d---selubidu.pdfIn PDF document text
    • http://om-ar.com/userfiles/file/volevomaruziligafug.pdfIn PDF document text
    • https://www.xyoaa.org/sites/default/files/files/88563580973.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161348dff5434c---jukamo.pdfIn PDF document text
    • http://streathamtaxi.com/survey/userfiles/files/36793425588.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613c070eec464---nevowojiwijejizuk.pdfIn PDF document text
    • https://hr-serdahel.hu/images/file/8169660888.pdfIn PDF document text
    • https://st-stephens-church.com/upload/File/jawegesujeka.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_off0000af78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF78 11368 bytes
SHA-256: b1f4fa6ca0193617659330f72b0ee0d9fc3ae9f88e3447eea89933aa6b1e4036
font_01_sfnt_off0000c9d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9D1 15468 bytes
SHA-256: 5248c86e04b0a5b074689479977cb36b251dd0fa19f1152609d03a4fd52bd997
font_02_sfnt_off0000f105.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF105 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1