Malicious PDF — malware analysis report

Static analysis result for SHA-256 355b2edcacf4253b…

MALICIOUS

PDF

44.3 KB Created: 2021-09-04 12:36:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 213304171c602eb3ab5db3b5d4428c10 SHA-1: 1c77bacddf1df5ea87f5bc68d04c5f8c6c95949b SHA-256: 355b2edcacf4253b4e4410089e08bf6c6183da6bd5535ab87f46f57208f4eded
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a deliberate attempt to create a deceptive web presence. No scripts were extracted from this sample, but the overall structure and URL distribution strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7407

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://garglob.ru/uplcv?utm_term=removing+your+pdf+metadata PDF link annotation
    • http://bscartridge.com/pic/35530876186.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/290045c237cc25de20ab5d0bf230e362/94184962709.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/t6afm6t4g2g0e4s9rlf7daca02/24644805581.pdfIn PDF document text
    • http://cosyromania.com/media/file/82747246085.pdfIn PDF document text
    • http://nhatnguyen.vn/media/ftp/file/demosaz.pdfIn PDF document text
    • https://etadelloro.it/images/file/79516288362.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/4169fe9986edc6921f9a575d71438d04/90306911594.pdfIn PDF document text
    • http://9meclinic.com/ckfinder/userfiles/files/rugovuwo.pdfIn PDF document text
    • http://ikhmongol.mn/ckfinder/userfiles/files/vezipamalobozo.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/453bcbac69f7f38199e3fbfeffe76202/85865582127.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/salepukupenosozazufij.pdfIn PDF document text
    • http://mnogonomerov.ru/uploads/file/4333677291.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/bapapasidokek.pdfIn PDF document text
    • http://bbfrontedelmare.com/userfiles/files/66392527292.pdfIn PDF document text
    • http://blissworldbeauty.com/newerac2c/userfiles/file/kepotumikolimoxesizetofab.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/3c3d86c05f489773d42b0539f08bec4d/22545288243.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/e03bcec2aa81dd1d3c8cfe5958de3932/86424948046.pdfIn PDF document text
    • http://jarosi.hu/files/file/xikomobage.pdfIn PDF document text
    • http://werder-ritter.de/UserFiles/File/xivobojurifoximuluju.pdfIn PDF document text
    • https://ubk-sad.de/azubi/userfiles/files/38634744672.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/c1j3mulvnujc2nik81ip2q4p41/gaxokezemilutafitup.pdfIn PDF document text
    • https://marblobathware.com/app/webroot/img/files/dabawadawipakeporesilo.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/j54dc336m17d3fvobphp30shhc/71136295376.pdfIn PDF document text

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