Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b7cd941a2e04d3b…

MALICIOUS

PDF

64.0 KB Created: 2021-09-15 16:56:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 27ec7ed4bba3a189af134692908e47b0 SHA-1: 54db4182b1bc308b8c6936c2a5d393ddedfab72e SHA-256: 2b7cd941a2e04d3bde0c6921866ea544dc74efa7453bdb0f864588ca3fcc13cf
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 a link farm pointing to multiple potentially compromised websites, likely intended to lure users into downloading further malicious content or visiting phishing pages. The presence of embedded URLs and the nature of the link farm suggest a phishing or malware distribution attempt, aligning with the Spearphishing Attachment technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5692

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 http://www.jindatunnel.com/up_files/file/78135373154.pdf In PDF document text
    • http://sahrugs.com/userfiles/file/wefulevuw.pdfIn PDF document text
    • https://aventura-agence.lu/userfiles/files/19345236022.pdfIn PDF document text
    • https://renetravel.ro/images/files/49018617541.pdfIn PDF document text
    • http://kipia-nn.ru/userfiles/file/8960019443.pdfIn PDF document text
    • http://memsports.com.br/admin/libs/ckeditor/ckfinder/files/daxozonewukivipemopazufa.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/7fa4cf693cc82e67b1313ea3e6a1bc06/32745255410.pdfIn PDF document text
    • http://dayuntang.com/assets/uploads/ckedit/files/20210904140031.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/gbq745k608hqndprd5i4h6ndo1/44738719956.pdfIn PDF document text
    • http://mariekevanvlierden.nl/survey/userfiles/files/32954633286.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f827a77966---venipa.pdfIn PDF document text
    • http://astmasme.com/userData/board/file/40566792036.pdfIn PDF document text
    • http://www.smwiarus.pl/ckfinder/userfiles/files/sikekarugamoj.pdfIn PDF document text
    • http://dieukhactransam.com/uploads/files/24477275113.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b372568474---bajurupupuwameliwiparaz.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139f5a9a7ce1---fojefejobemodomubipek.pdfIn PDF document text
    • http://moscreen.in/cmsfiles/file/88262348683.pdfIn PDF document text
    • http://cherryontop.pl/upload/fotki/file/14557405736.pdfIn PDF document text
    • https://akgoz.zemta.com/uploads/files/40828244599.pdfIn PDF document text
    • https://larustt.com/upload/ckfinder/files/58644534669.pdfIn PDF document text
    • http://ohana1bbq.com/uploads/files/dujazutazidadowu.pdfIn PDF document text
    • http://pet.nfe.go.th/m_site/ckfinder/userfiles/files/12602270357.pdfIn PDF document text
    • http://electric-kernbichler.at/53685610294.pdfIn PDF document text
    • https://hijaulumut.com/contents/files/doromuburomurafifuz.pdfIn PDF document text
    • http://another-partner.morefriendship.com/upload/files/kifusideserisojudibe.pdfIn PDF document text
    • http://spain-ex.com/images/blog/file/jeradasu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=why+do+otters+eat+with+their+heads+upPDF 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_off0000e29d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE29D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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