Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cc22028a4eacace…

MALICIOUS

PDF

62.0 KB Created: 2021-09-01 08:50:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 275041547654c0482b14954c993f33d8 SHA-1: 7fed5ab0a3115f5dae826675bf8eed27417900c0 SHA-256: 8cc22028a4eacacecd0205f455462e9b4c1f2c7cd47dd500dafbb4c90ccb4fb2
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous links, many of which point to compromised CMS upload directories. The ClamAV detection and the heuristic firings indicate this PDF is designed to lure users to malicious sites, likely for phishing or to download further malware. No scripts were extracted, but the structure strongly suggests a malicious link farm.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4953

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://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/9871bdba0fd3db93408bc9e37a08f15f/bizufezu.pdf In PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac72d10d59---putupipizubunovur.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/d5a098e326ffb6e2da462e245232c216/mimigamijurisafu.pdfIn PDF document text
    • https://csn-alliance.com/data/files/ganutakenazosopidunir.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/guvovurer.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/nina838u30dnn6qciok2ioo09k/21501402008.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021080712285984.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/bt2k1rann5u2vhd5pjf3km2fu2/paredi.pdfIn PDF document text
    • http://windowsplusllc.com/ckfinder/userfiles/files/29997793840.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/b81b51fb03883d1988781137331123c3/52024712648.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c200e3d14e4---lekibapisad.pdfIn PDF document text
    • http://dennehylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/witirudewogivugunor.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610648026c972---5667991206.pdfIn PDF document text
    • https://posh.hr/files/kibomijonarivoraf.pdfIn PDF document text
    • https://albawadiroad.com/userfiles/files/8567172604.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/15e646a528c6b30faae24b78571f65e6/seguwetimizezudafefi.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160724facea6e0---91829930438.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/40018590f5bb91cbafa9523c41270628/55987934339.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/7126db4e7384291381f7956e3835c25b/zarulumidifigotu.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/ded2fccfa21ad4c467f28581504279df/44280104896.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608b2bb0465d7---26092978912.pdfIn PDF document text
    • http://arlingtonhigh1961.com/clients/e/ef/ef36f0800c0a5d5a0b00d5ecc8c3c6da/File/nekinaturabuxegisos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=define+expressed+powersPDF link annotation

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