Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9f0674fb2479d3d…

MALICIOUS

PDF

62.3 KB Created: 2021-09-21 00:43:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 78214d3d3bcf95294f82f25f9062bed2 SHA-1: ec515a4aa01d2bfaa7a2dfbb0075f367102400e9 SHA-256: c9f0674fb2479d3dbec8a94d6482df2d7d02f521be26ed1b973f2d12696c21e7
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a phishing or malware distribution scheme. The ClamAV detection and ML classifier further indicate malicious intent. Although no scripts were explicitly extracted, the nature of the URLs and the PDF structure strongly suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7858

Heuristics 5

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://wastran.ru/uplcv?utm_term=office+web+login PDF link annotation
    • http://www.ecvbrass.ch/user/web/file/36153682813.pdfIn PDF document text
    • http://appli-veolia.net/ckfinder/userfiles/files/96583162527.pdfIn PDF document text
    • https://nidi.mk/ckfinder/userfiles/files/26402374906.pdfIn PDF document text
    • https://barcelonamedicalcenter.com/files/galeria/files/fofivoji.pdfIn PDF document text
    • http://kaitianjinghua.cn/admin/userfiles/file/202109181617094765.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/161455541628a5---tiguwuxor.pdfIn PDF document text
    • http://itaxabc.com/userfiles/file/20210905220048_160813668.pdfIn PDF document text
    • http://travelci.ru/ckfinder/userfiles/files/lijiku.pdfIn PDF document text
    • http://jsushibrea.com/uploads/files/dilijewetuwevaxiwufej.pdfIn PDF document text
    • http://xn--h1aaebajlcgx.xn--p1ai/sadm_files/2203548821.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138c4db7990a---79339246808.pdfIn PDF document text
    • http://pantipplaza.com/userfiles/file/kazonekedejusafuwol.pdfIn PDF document text
    • http://kor-ra.ru/UserFiles/file/21652631453.pdfIn PDF document text
    • https://e-ssuances.com/ckfinder/userfiles/files/visamejewilujazimosu.pdfIn PDF document text
    • https://htchninc.com/d/files/segivaxujivusetemonabo.pdfIn PDF document text
    • http://nuovojob.com/userfiles/files/91683142707.pdfIn PDF document text
    • https://jungleflightchiangmai.com/Uploads/files/840212648.pdfIn PDF document text
    • http://bsinteriordesigner.com/userfiles/files/mofusideligekatugabi.pdfIn PDF document text
    • https://duvanco.be/docs/files/10728138959.pdfIn PDF document text
    • http://qamsar.org/userfiles/files/46487962994.pdfIn PDF document text
    • http://veterinariacasettamattei.it/userfiles/files/berijirapar.pdfIn PDF document text
    • http://cutskytools.com/d/files/puret.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/0e6o1500i92ptknukf4mmokuv4/22931755753.pdfIn PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/juxuwusovepiseziledu.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b8da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d0ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0EC 16316 bytes
SHA-256: fae1c156ce2f1d0ce82fb4101520719eb7fe76ee21cb734388694ef6563be444

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