Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8173a832270bc50…

MALICIOUS

PDF

70.2 KB Created: 2021-09-16 18:33:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 32ef583eb1c7ef3216f323710bd3957f SHA-1: df69e8eb11dc8c3ff32f0670187b2daa79587ed2 SHA-256: e8173a832270bc504e20491a8312e15ab1da456b97e131a0d5f50d8f0bac7e7f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to potentially compromised websites or disposable hosting, suggesting a link farm or phishing lure. The PDF's structure and the presence of external URIs indicate an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7375

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 http://pentas.eu/userfiles/file/fufizoliwabitivosewovir.pdf In PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/903f8b1c5b2dbad5f0a7ad934596d1e5/zewezibatutofinimofadoxux.pdfIn PDF document text
    • http://saltokisport.com/uploads/files/garujuxe.pdfIn PDF document text
    • http://2sisaccount.com/userfiles/files/49728980569.pdfIn PDF document text
    • http://kemenyseprosiklos.hu/upload/file/87171752641.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021091315221896.pdfIn PDF document text
    • http://saothienemb.com/uploads/images/files/wipobe.pdfIn PDF document text
    • http://xedaptheduc.net/app/webroot/uploads/files/deduwewir.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/58016329863.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/25500661973.pdfIn PDF document text
    • http://indexone.ru/upload/file/roliseji.pdfIn PDF document text
    • http://como.gattinonimondodivacanze.it/themes/userfiles/files/rewikisolelem.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/9d47c33fa944c0eb5e2795a094513fea/zuzaxupuno.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613f9817c44d8---ritolorasixiwuxanaji.pdfIn PDF document text
    • http://cartopack.com/Images/file/juliwadejetat.pdfIn PDF document text
    • https://promobryansk.ru/userfiles/files/rowalepaf.pdfIn PDF document text
    • http://drthchowdary.net/userfiles/file/90897746686.pdfIn PDF document text
    • https://girl0229960192.com/upload/users/files/gagibavegorikozap.pdfIn PDF document text
    • http://rsti.biz/files/fck/file/papuburujok.pdfIn PDF document text
    • http://ttworld.hu/uploads/content_files/files/kosidovijegewoj.pdfIn PDF document text
    • http://email-database.info/userfiles/file/boluzovopenifizelogam.pdfIn PDF document text
    • https://pnvvr.ro/userfiles/file/kamapoxanef.pdfIn PDF document text
    • https://wildarium.com/ckfinder/userfiles/files/26940813247.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+download+modded+apkPDF link annotation
    • 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_off0000bf00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF00 17996 bytes
SHA-256: 5ef3832fe0e31a3737171a9783d3c85e9edf1451a1d4d2e69bf9e4c458eb7dcb
font_01_sfnt_off0000ed8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED8C 10364 bytes
SHA-256: 92e24bcdecc994eca8a450afd84b129d1ff2a3cf8ffe37c2e76ea90d85ed65e3
font_02_sfnt_off000104ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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