Malicious PDF — malware analysis report

Static analysis result for SHA-256 0163cdc0fbc0c313…

MALICIOUS

PDF

83.3 KB Created: 2021-09-17 16:06:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: e10fa3ebbbd39c0610a26a90945e37f9 SHA-1: 978ce25649c8cd7572fd06945ff7b70129790004 SHA-256: 0163cdc0fbc0c3137971dd4dfbded864de6c43a0b02441a4c5f5533156482b77
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, many pointing to compromised WordPress upload storage, suggesting it's part of a phishing or malware distribution campaign. The ClamAV detection and ML classifier strongly indicate malicious intent. The presence of embedded URLs and the 'link farm' heuristic further support a phishing or redirection attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://queure.ru/uplcv?utm_term=say+yes+2018+movie+watch+online PDF link annotation
    • http://naturestuff.nl/siteimages/file/mokuvizidurifatipivozof.pdfIn PDF document text
    • http://nj-rshb.com/v15/Upload/file/202199128261655.pdfIn PDF document text
    • http://gapp.fr/medias/files/53812286525.pdfIn PDF document text
    • https://avistravel.activsport.ro/userfiles/file/36943683664.pdfIn PDF document text
    • http://elektrostroy.kz/ckfinder/userfiles/files/bejatud.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/i43i9q2b10djra4f8jj32ks4k3/gikiz.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/52848825057.pdfIn PDF document text
    • https://interference.ajoda.eu/userfiles/files/15078963503.pdfIn PDF document text
    • http://koreadramatour.com/FileData/ckfinder/files/20210913_0E7271BADD4B3FE6.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/gbq745k608hqndprd5i4h6ndo1/44738719956.pdfIn PDF document text
    • http://vpsystem.com/files/fck/juwewedalularilojosuzupa.pdfIn PDF document text
    • http://lesen-und-schenken.de/userfiles/files/jexanojetomox.pdfIn PDF document text
    • https://viboot.traigiongthuha.com/ckfinder/userfiles/files/72053751288.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f9b9101fbe---9445079592.pdfIn PDF document text
    • http://healthywithhart.com/res/file/12557028451.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614007939c7fb---88691385158.pdfIn PDF document text
    • https://chungcungoaigiao.vnpec.xyz/uploads/files/85501897045.pdfIn PDF document text
    • http://foreverymuslim.net/home1/forevev3/public_html/foreverymuslim/upload/file/panavozov.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/fatibuki.pdfIn PDF document text
    • http://kbautotech.com/board/datafiles/imagefile/53876081808.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/99938673233.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/geropevobifapepozijobej.pdfIn PDF document text
    • https://muacash.com/webroot/img/files/nakimerejokowidizalagu.pdfIn PDF document text
    • http://qazaqbanki.kz/data/content/files/sujavofedetasupamok.pdfIn PDF document text
    • http://salamatekhanevadeh.ir/ckeditor/files/files/94274704976.pdfIn PDF document text
    • https://tidymoney.com/ckfinder/userfiles/files/19649541790.pdfIn PDF document text
    • http://diakmelo.hu/ckfinder/userfiles/files/kewajakusemovexugog.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_off0000ddfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDFE 17924 bytes
SHA-256: cc9b91e51add462ce5eff31693712c1cc13450ad6dccbab6a21771e101719092
font_01_sfnt_off00010cc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC9 11236 bytes
SHA-256: 43924cd16fd004dd18e83e18529109aabed12541ae170f0b0bb6015e9c007589
font_02_sfnt_off0001270f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1270F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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