Malicious PDF — malware analysis report

Static analysis result for SHA-256 e98b819263b790bc…

MALICIOUS

PDF

80.5 KB Created: 2021-08-03 09:53:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a46c6a9a7d19cde84e753b36f8dba146 SHA-1: f61f816b720a3e3b0369e191b9bed259e5407d44 SHA-256: e98b819263b790bce4682121136eeb576a8207c83133e999e05adb8a7ec33482
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for executing malicious code. It also contains numerous external URIs pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://drafthe.ru/uplcv?utm_term=book+of+shadows+blair+witch+2+%282000%29+online PDF link annotation
    • http://perles-del-beya.com/userfiles/file/kezugatuwuxabanebogotima.pdfIn PDF document text
    • https://www.hemingway.bg/app/templates/js/ckfinder/userfiles/files/59313218889.pdfIn PDF document text
    • https://elmaga.lt/components/com_mijoshop/opencart/image/data/files/74669524296.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/86bfa7d0a5a37c9ba69a64e8f3b01e9b/45485418838.pdfIn PDF document text
    • http://dolphinkorea.com/files/files/zomepixadigan.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160853d38eabea---petokawiduloluru.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/70646003864.pdfIn PDF document text
    • http://mixmarketing.vn/upload/fck/file/kuriginalazoxipuwu.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210606155658069.pdfIn PDF document text
    • http://hondatayho.vn/images/ckeditor/files/numobarovugimoxalodafep.pdfIn PDF document text
    • http://www.northern-japan.com/image/upload/File/zexelat.pdfIn PDF document text
    • https://greenfuturevietnam.com/Upload/files/mopezikidimu.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af58818f3ae---vikiropexevumozusid.pdfIn PDF document text
    • http://bangkoksolarpower.com/syner_upload/images/files/zarapatumejotonupuzak.pdfIn PDF document text
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/itsj8indmpe1cjo89rjn0i6vd4/6366689499.pdfIn PDF document text
    • http://yongqingtech.com/d/files/46608234744.pdfIn PDF document text
    • https://tahitotfaluovodak.hu/ckfinder/userfiles/files/32903458609.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160fca2bdd8a32---zirakomagak.pdfIn PDF document text
    • http://stjconsulting.it/userfiles/files/javababuk.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/b62ef2925bbb54334a6d758b99492e21/favolukekujokekuroxafo.pdfIn PDF document text
    • http://minerva-collection.net/files/files/14507123327.pdfIn PDF document text
    • http://drthchowdary.net/userfiles/file/81574512543.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/80990458680.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_off0000d253.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD253 17560 bytes
SHA-256: b5ac5742532d03dccc4fdd4b63b031d887ca5766a2233d96c8e880049063c398
font_01_sfnt_off000100b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B4 11340 bytes
SHA-256: 2ff9e3cc4153dedae3d3113d1cd3c3c71a5a46ac928ba7336b106314f52a55d9
font_02_sfnt_off00011b9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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