Malicious PDF — malware analysis report

Static analysis result for SHA-256 477efe571c9a2971…

MALICIOUS

PDF

69.3 KB Created: 2021-09-11 13:10:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e3ccd2bd219f8f553eeeacd2dc4f43c8 SHA-1: b172e0b3c2916ad9cfd5b8147abfe1b89ac98d67 SHA-256: 477efe571c9a2971db747958c21c908344d0fee555f3ba401d7d2b4c3de6b34a
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV, indicating it's likely a phishing or malware distribution lure. It contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of embedded JavaScript (T1059.007) further supports its malicious nature, likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4606

Heuristics 6

  • 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
  • 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://synerhu.ru/uplcv?utm_term=gdmss+lite+apk+download PDF link annotation
    • http://igabana.com/upfolder/e/files/20210908155746.pdfIn PDF document text
    • https://typeone.com.my/ckfinder/userfiles/files/20102384497.pdfIn PDF document text
    • http://bftt.marketsearching.com/upload/files/26316255150.pdfIn PDF document text
    • http://recviem.ru/img/upload/gogimutebisegomukumi.pdfIn PDF document text
    • https://pristineleather.com/userfiles/file/robuwubazagi.pdfIn PDF document text
    • https://ecohort.info/userfiles/files/10900805941.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161300ed158d5a---38474410893.pdfIn PDF document text
    • http://jingyilin.org/uploads/file/digirabexexevorexaxo.pdfIn PDF document text
    • http://pitin-akutsu.com/js/upload/files/30690831879.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/829fadcb9419db2961a7595479d94cab/85966947081.pdfIn PDF document text
    • http://jubileejec.com/userfiles/files/32345606674.pdfIn PDF document text
    • http://obasekiestates.com/UserFiles/file/fisuzazalogafu.pdfIn PDF document text
    • http://museodegliarazzimarsala.com/userfiles/files/vuduf.pdfIn PDF document text
    • http://jornalespacoaberto.com/app/webroot/datafiles/editor/files/40798353293.pdfIn PDF document text
    • http://chemtron-vostok.ru/media/file/supubilujikop.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/51403639340.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/hlnfbhpjdth3qvgr64b65hqqs1/31448609586.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/dff6ad64dd653c9a2900b78a9fed17cd/75544824918.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1612ead09dc94b---wunogodotolejozozenabiz.pdfIn PDF document text
    • http://fornacedelia.it/userfiles/files/livapinobona.pdfIn PDF document text
    • https://www.tvmreza.tv/ckfinder/userfiles/files/32498559280.pdfIn PDF document text
    • http://wakabaeducation.com/userfiles/file/81008621938.pdfIn PDF document text
    • https://hantverksakuten.se/ckfinder/userfiles/files/nifamirevutujimolupoxipuk.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_off0000caf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAF5 10672 bytes
SHA-256: f2d3ec373d334030c8a9887166f5b35bb8c9834cbc6171a8d4cdffc831363211
font_01_sfnt_off0000e37d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE37D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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