Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c52d67abeb31c31…

MALICIOUS

PDF

62.5 KB Created: 2021-09-08 06:35:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 66c0f6a4cfdd5effd5e0814ca19ccd1e SHA-1: ebbad7fe597ce9f3dc616c22e6a515c4c6576f61 SHA-256: 9c52d67abeb31c31602184469debe62c9612fbf487bba1931596433ec3a54d94
154 Risk Score

Malware Insights

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

The PDF contains multiple links pointing to compromised websites, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious content or facilitate further exploitation. The document body is heavily obfuscated and unreadable, providing no direct textual clues to the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9100

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://mudrun.com/home/mud/public_html/ckfinder/userfiles/files/49175997640.pdf In PDF document text
    • https://rosettes.it/userfiles/file/gubabilumivanutenowaf.pdfIn PDF document text
    • http://wignaccent.com/FCKeditor_2.6.3/userimages/file/20210617065839.pdfIn PDF document text
    • https://benjamindreyer.com/wp-content/plugins/super-forms/uploads/php/files/b0528ee7843b6352a07191b8cebe30b7/56558399709.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/vv86us2pilnabrg9fqtadnb75e/nanoxufebuxal.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/ivkbnne82cja4vefnve5tv65hi/tipirupesiloze.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/gqi8e56fi2rn7u9a957v422lbv/tejolafukew.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da78cfc1ceb---tinogufokamewofukuvopozu.pdfIn PDF document text
    • http://ferrogep99.hu/static/media/file/begulivuvuzizum.pdfIn PDF document text
    • http://kyanite.tv/userfiles/file/lutajomonovufamoke.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/lasezokaga.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1608382820b8d9---43273705686.pdfIn PDF document text
    • https://giorgiosantinelli.it/file/bagusoxuf.pdfIn PDF document text
    • https://iqrainternationalschool.org/_assets/files/kanupejiguxogeludiwakumoj.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/bd44b5cd8f759a00cec075c025dfa75f/64464389406.pdfIn PDF document text
    • http://epoxidice.ro/mm/file/84169017240.pdfIn PDF document text
    • http://qianshunqs.com/admin/upload/ledokiwas.pdfIn PDF document text
    • http://agriturismoilnoceto.com/userfiles/files/pukirej.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b445de88b26---4052906302.pdfIn PDF document text
    • http://adveotec.com/img/file/63648524421.pdfIn PDF document text
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072866275c14---lixulepuma.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1609d902d81b7f---golob.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/c94241692688513252c30e0ab8265dc6/puxujavafexokusazob.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/aa8b79d419e5a894f3a3c0cb78a6b7fc/88585204690.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=dc+welding+machine+circuit+diagram+pdfPDF 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_off0000daec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAEC 10964 bytes
SHA-256: f4509b9497953f47e6fd6bd36ce6d7ac6618c5f501e9db2314945e9e405fbdb2

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