Malicious PDF — malware analysis report

Static analysis result for SHA-256 815cef30ee8d2afc…

MALICIOUS

PDF

71.6 KB Created: 2021-07-02 22:44:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d917be286e689c2fae71b4f360b134ea SHA-1: 392d494410cfd6bfe4e64504e534baafe1fe8b7d SHA-256: 815cef30ee8d2afce8e031a2de8718376e2a1c3ea2de0e0d32ad18954470912c
154 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised websites, many of which are hosted on disposable domains or use common CMS vulnerabilities for file uploads. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to lure users to download further malware or engage in phishing. The document body is heavily obfuscated and appears to be junk data, suggesting the primary function is to host the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7307

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://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/19f6b0b1b345e58e495e7ae9f17d00ea/rixasowufijexalonolekik.pdf In PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160deced3b3ef9---wizepu.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/cc5ef93b2062938929dfa50ecb0bec98/fosavetazudomalowimutopaw.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/b6de7616df30a5f79255412baee619fe/laxis.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b3865fd028d---duvijikepigevevifudoro.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/49017795299.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/487f7caa0371371b04a9d6ba7d4bfabd/41358862656.pdfIn PDF document text
    • http://pensjonatagat.pl/userfiles/file/90615155417.pdfIn PDF document text
    • https://gelblighting.com/userfiles/files/fumonibozajaratek.pdfIn PDF document text
    • https://zweefvlieg.net/userfiles/file/50551449149.pdfIn PDF document text
    • http://abbwingslynnhaven.com/uploads/files/wamuzenakudibawetuf.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/38eecd3ed4b5c09ee867951354de4cbf/26265646943.pdfIn PDF document text
    • http://rideco.hu/upload/file/toguj.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098bf81ebe0c---52488080282.pdfIn PDF document text
    • https://kompaspt1.com/contents//files/lareniguxala.pdfIn PDF document text
    • https://gizaviation.com/uploads/files/32279481364.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/ae1f8413c9b7284e94b21523da7cb2e1/10621146244.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/47kf9gavjv90dpd2v4jiooeoq6/jiduxezujumobasodik.pdfIn PDF document text
    • https://skvacations.com/userfiles/file/rubivizetorisoxezaxaz.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/16561255704.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/9b7161bea05f6268fd71eaa33237a80d/78218297858.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/sojekolizuve.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=sql+and+plsql+interview+questions+and+answersPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f152.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF152 10860 bytes
SHA-256: 73b18042026804570fc1a36357131b86a4809fd8b348975cca53f6b4f9a0dfed

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