Malicious PDF — malware analysis report

Static analysis result for SHA-256 58a7d180dc517ddf…

MALICIOUS

PDF

48.8 KB Created: 2021-09-11 13:25:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a4a262af4540c072708a9c7571a9f886 SHA-1: 673f6bb34783d96d8c27dbe9bcbb9d369df80530 SHA-256: 58a7d180dc517ddfa53cddda93ab593e6338539c2885916e1024a3bbdcde2a24
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier flagging indicate malicious intent, likely phishing or malware delivery. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly supports this conclusion.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8963

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://coretry.ru/uplcv?utm_term=rupaul%27s+drag+race+streaming+service PDF link annotation
    • https://eliteplacementagency.com/uploads/files/43674723446.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161329e0fdf688---poxupekezow.pdfIn PDF document text
    • https://gobelsprofil.com/upload/files/zazuletetedivodusenagobe.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/9991504435.pdfIn PDF document text
    • http://strojsteel.cz/webpagebuilder/ckfinder/userfiles/files/68262589118.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/29334112904.pdfIn PDF document text
    • http://fantasymusic.it/userfiles/files/28664651695.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613b16c906276---moserozopumugo.pdfIn PDF document text
    • http://studiomalpocher.it/userfiles/files/1418564073.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/jalivavis.pdfIn PDF document text
    • https://oasis-travel.ro/files/24721796507.pdfIn PDF document text
    • http://bandenplaats.nl/cmsimages/file/xeranuzaw.pdfIn PDF document text
    • http://se-ty.ru/uploads/userfiles/file/wizove.pdfIn PDF document text
    • https://mayxaydungthienlong.com/uploads/files/files/torejiremuwediku.pdfIn PDF document text
    • http://chenruichem.com/upload/files/7796810766.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/16133f1b8c0bbe---59968126397.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc13ae7b9a---zagugafategalenibegavas.pdfIn PDF document text
    • https://rrr71.ru/upload_picture/rubaw.pdfIn PDF document text
    • http://joyerialaplaza.com/ckfinder/userfiles/files/32691965132.pdfIn PDF document text
    • https://htlexpress.com/ckfinder/userfiles/files/fepufunumaxomaposire.pdfIn PDF document text
    • http://budgettranslation.hu/sites/default/files/file/towexozagafejov.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd3e3c657a---kirutagawawedezet.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/siguwegejajoxir.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/83651562383.pdfIn PDF document text

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