Malicious PDF — malware analysis report

Static analysis result for SHA-256 98a781963694912a…

MALICIOUS

PDF

85.9 KB Created: 2021-09-21 01:16:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ba561c13920dc9ebfe9c4bc272cf859d SHA-1: a93fdd6c7458cc65badd18c39060a0aa29c49507 SHA-256: 98a781963694912a904dc534d4726039055c3c6b7d47957c6d855f5d6df1eddc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The embedded JavaScript is a primary mechanism for executing malicious actions within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://smidgel.ru/uplcv?utm_term=va+health+care PDF link annotation
    • http://placidlakes.com/larpm/uploads/file/19858848793.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/9g982s2q85pnjh2hb6hoqv6ap6/danafuzugobe.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613a095b4acc7---jadilimizexuvona.pdfIn PDF document text
    • https://cosmopolitanhotel.eu/uploads/wysiwyg/files/65867634971.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/fupafowakulotuwijajamu.pdfIn PDF document text
    • https://euronuts2009.ge/files/files/4510317203.pdfIn PDF document text
    • http://study4student.com/cache/fck_files/file/rokivadez.pdfIn PDF document text
    • http://savytrading.com/userfiles/file/bezilobanewupo.pdfIn PDF document text
    • http://xn----7sbbbizu2bxaod.xn--p1ai/userfiles/file/makotaxa.pdfIn PDF document text
    • http://jamones-luna.shopcloud.es/ckfinder/userfiles/files/37997724635.pdfIn PDF document text
    • http://cleanking.net/userData/board/file/tobalipogorufepa.pdfIn PDF document text
    • http://ck-buhgalter.ru/userfiles/file/35910791154.pdfIn PDF document text
    • http://tamphuhiep.com/Images_upload/files/62767465341.pdfIn PDF document text
    • https://andana.us/files/files/vunelesupewaxuwol.pdfIn PDF document text
    • https://kisikana.hr/UserFiles/files/mavamuno.pdfIn PDF document text
    • https://toppelletmachine.com/d/files/lixedu.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/00ccd5bdb87ab93596befc17747d2a26/46239858336.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/40142306898.pdfIn PDF document text
    • https://lecachet.fr/docs/files/39035850689.pdfIn PDF document text
    • http://rcot.by/pics/files/kujoxire.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/xuliwazibeduvebuwe.pdfIn PDF document text
    • http://burningspearmarketplace.com/js/ckfinder/userfiles/files/41548628451.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_off0000edea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDEA 18100 bytes
SHA-256: 1a27ced5728d773b4efa5b5a211000b8a7eb2b46b0ba7277fe65c0cde81ac175
font_01_sfnt_off00011c1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C1D 9812 bytes
SHA-256: a9c84a8a12c93dd9d5683a0c0cfe891a3079f0a67ea91b7a8171d6ca698f0686
font_02_sfnt_off000131ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1