Malicious PDF — malware analysis report

Static analysis result for SHA-256 255c2cc6766abfba…

MALICIOUS

PDF

76.2 KB Created: 2021-09-05 20:02:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0099065c63d6ba70ae7736bf278a066c SHA-1: ef72a4ca06e2108ebfab566f995c7bc712706661 SHA-256: 255c2cc6766abfbab38e1f8f58b985088af2ceeb995d5c59fe6614004b02723f
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7569

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://amadesafar.ir/basefile/amadesafarir/files/42332614760.pdf In PDF document text
    • http://rkmaster.ru/uploads/files/kujuxez.pdfIn PDF document text
    • http://chipgene.com/image/files/20210805_190308.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1c7526499---88033856363.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160e73ae4dbb9d---nezimufawavavamokexor.pdfIn PDF document text
    • http://liceoadultos.juniorcollege.cl/userfiles/files/buzebivenoxituvijuvof.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/xamonefakixime.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c9ac76eec71---45592100939.pdfIn PDF document text
    • http://thaoduocquyhiem.com/userfiles/image/file/biteru.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/6032762062.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd43ceacab1---sozevebupawejanavawojopis.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609c48b758a87---19570042452.pdfIn PDF document text
    • http://perlawarmii.pl/userfiles/file/pofixanapejimosu.pdfIn PDF document text
    • http://www.pics4us.de/userfiles/file/gorejekuwututo.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/m1ijk79g80tg3uj8qbpphgrmc2/xewutomulupuk.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130aba802940---72515553836.pdfIn PDF document text
    • http://imoroz.by/upload/file/69122878835.pdfIn PDF document text
    • http://polskienarty.pl/data/aktualnosci_imgs/file/texinezakojikuvelopo.pdfIn PDF document text
    • http://immobilieninvestors.eu/userfiles/file/55930084759.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/a780ca9f21c0f4782ffd442657f8e483/65999323224.pdfIn PDF document text
    • http://www.trisad.kz/ckfinder/userfiles/files/96356172477.pdfIn PDF document text
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/l1fqkm1pvlk6667vr3hcr4h2g5/zadazajijefuxifaxovoz.pdfIn PDF document text
    • http://acudrved.com/ckfinder/userfiles/files/wufokowiponaro.pdfIn PDF document text
    • http://zafirkort.com/uploads/files/69493418116.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=types+of+diplomacy+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_off0000fd6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD6E 18880 bytes
SHA-256: fe16d9905ccf0e4df5791850da886fd8cfec6fdbd27ff566f89a33180d73e74a

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