Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f506d09030ecbe0…

MALICIOUS

PDF

63.6 KB Created: 2021-09-07 17:10:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4ee633079a5d1c4f3fa19be57646ddad SHA-1: 63c417eff742457745f0f905323edaa0f98c8dfd SHA-256: 8f506d09030ecbe0045af12514e475a57e18e0718198602036556bf8908c7f58
154 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting. These URLs likely serve as a link farm to redirect users to malicious content, such as phishing pages or malware downloads. The ML classifier and ClamAV detection strongly indicate malicious intent, consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9500

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://krisoc.ru/uplcv?utm_term=pdf+file+compress+small+size PDF link annotation
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/63828776381.pdfIn PDF document text
    • https://pachetedeturism.ro/images/files/jemilusutemubesokul.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089c78689b8f---badepunubobefubol.pdfIn PDF document text
    • https://incoyun.com/calisma2/files/uploads/kuvuxuwa.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/5f9ab3e133d4eb7c6faf5b7a114e2b76/dafemetilewizi.pdfIn PDF document text
    • https://cremyco.com/app/webroot/docs/file/41747398596.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607bbd468a484---likemageletigawifa.pdfIn PDF document text
    • https://viticoltura-enologia.com/file/21423589482.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/feed320ccbebdc7c08c9f88aed410cc6/82424873319.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/16095bf9898a3f---dedemejamisen.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/60790966239.pdfIn PDF document text
    • http://hong-tour.com/FileData/ckfinder/files/20210907_DB9F135A0EB58ACC.pdfIn PDF document text
    • https://zhavezbozi.cz/data/file/45319651551.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/id595n6jotb92sult5j9pdrb6d/pafuwotawoxukupenalo.pdfIn PDF document text
    • https://sjalikave.hu/pictures/file/vibezipigima.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608abec9a32db---75158730620.pdfIn PDF document text
    • https://fultoys.com/userfiles/fataxivunirakakajotegadol.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/pixejobepumabakivavu.pdfIn PDF document text
    • https://juegosinflablesarizona.com/files/16900084883.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/fr1j77pcc0di29ssejpsk1qke6/xalijupodazade.pdfIn PDF document text
    • https://calmoinc.com/upload/editor/file/85778561352.pdfIn PDF document text
    • http://color-gateway.com/userfiles/file/21155384937.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/pikuxesivemebojozibezu.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/xinusejumilu.pdfIn PDF document text
    • 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_off0000d8fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8FD 16956 bytes
SHA-256: 83e23e11269806c9a41cc676a5de601287745135358c925e30fce5d942b23f57

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