Malicious PDF — malware analysis report

Static analysis result for SHA-256 c582a4ddf34a0c1e…

MALICIOUS

PDF

83.1 KB Created: 2021-09-24 11:02:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e81fac7d93db0c9faa8c03efa23b3f5c SHA-1: cb5d144f210b87cd1c278b4d45a0d2fadb325749 SHA-256: c582a4ddf34a0c1efded0d9cdefed012a2a24aceea8090f5afd53b1eaaf6836d
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution T1071.001 Web Protocols

This PDF file impersonates a cloud document sharing service, a common lure for credential phishing. It contains numerous links to external websites, including one at 'https://oniceh.ru/uplcv?utm_term=wps+office+premium+apk+android', which is likely used to host malicious content or redirect the user to a phishing page. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://oniceh.ru/uplcv?utm_term=wps+office+premium+apk+android.
  • 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.
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • 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=wps+office+premium+apk+android PDF link annotation
    • http://autosklo.sk/pictures/file/79373434780.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/jejuraxaluziku.pdfIn PDF document text
    • http://capriololaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/buwipozubuwabal.pdfIn PDF document text
    • https://christianbelieversmatrimony.com/web/christiansbelieversmatrimony/photos/ckeditor/files/saxefex.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/15461046208.pdfIn PDF document text
    • http://goref.ru/files/file/wazovizegalarixasu.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/30773665868.pdfIn PDF document text
    • http://tlca.com/Content/uploads/files/dugafuxuset.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132a14c8472e---kuguwelemufesajimazuf.pdfIn PDF document text
    • https://pmfegypt.com/userfiles/files/10922718467.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/86c864eb76c4ad910d9044df6e4bc56d/78645335236.pdfIn PDF document text
    • http://silarperu.com/UserFiles/file/pojedukovizojubeborovemeg.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/23fae0283f48d35b04d31185ae95e6f3/wawosakirigefafedi.pdfIn PDF document text
    • http://starinviter.com/ckimagefiles/danesowulas.pdfIn PDF document text
    • https://tigaintan.com/contents/files/jemigis.pdfIn PDF document text
    • http://runwellconsulting.eu/file/file/92890735603.pdfIn PDF document text
    • http://bibliotekaludwin.pl/img/upload/files/zixuzasuvarafoza.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16135779d133af---67156103421.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/puzaduzubavopafulasomofoz.pdfIn PDF document text
    • https://tidurmalam.com/contents/files/13943740019.pdfIn PDF document text
    • http://reyazahmad.bscsaoner.in/ckfinder/userfiles/files/bozumukodibafepu.pdfIn PDF document text
    • https://costabravas.com/uploads/localidades/files/megofukafapagud.pdfIn PDF document text
    • http://www.miyadenthai.com/image/upload/File/noxegiludevekodubu.pdfIn PDF document text
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/fowimatidawasokokunut.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0d45156c7---povujirirasapomonoku.pdfIn PDF document text
    • https://aymfly.com/aym_image/files/9865170149.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_off0000dc30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC30 18992 bytes
SHA-256: 835d91642fadca9ebe4350e21c4c7d6f49b7a847071cb9fc116678cdf5cb0f56
font_01_sfnt_off00010d8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D8A 10820 bytes
SHA-256: 69e31c47f5592958c8302bb517f841c1bb728f0c9fb66c9c17c91a60a31eaf6f
font_02_sfnt_off00012684.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12684 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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