Malicious PDF — malware analysis report

Static analysis result for SHA-256 87c911811c1ba37d…

MALICIOUS

PDF

62.4 KB Created: 2021-09-27 16:50:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b749aab4ae4f91e4fda32fbc6836297e SHA-1: 414217c29f2dc1e38e7005008f6ed2fa37033b0a SHA-256: 87c911811c1ba37d8564f597ed7b5540c63309da4629655adcf03be9f74c9620
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, hosting numerous links to external websites, many of which are on disposable or compromised hosting. The primary purpose appears to be redirecting users to potentially malicious sites, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6567

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://tcyy88.com/userfiles/file/2021092320453673499.pdf In PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/161494916a1312---42450371499.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/18208740679.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/didademeximubu.pdfIn PDF document text
    • http://uticachemical.com/files/upload/files/81096755789.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f5323944ee---7099891430.pdfIn PDF document text
    • https://ixiu-23.com/uploads/files/202109090600058695.pdfIn PDF document text
    • http://ksiclubcom.ksiclub.org/svnprojects/DHD/Source/images/files/pulobo.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f7d6e503b6---vasopikekax.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143cd60cd249---22674715322.pdfIn PDF document text
    • http://altera.ukrstroyka.com/content/xuploadimages/file/25363091585.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133b0d70c8a7---kolivamajumaki.pdfIn PDF document text
    • http://aktifithalat.com/resimlerfiles/71028456819.pdfIn PDF document text
    • http://dr-temt.ru/images/file/2800853302.pdfIn PDF document text
    • http://www.bash.cl/media/file/kalojosigemadapo.pdfIn PDF document text
    • http://bytip.net/filespath/files/20210922211349.pdfIn PDF document text
    • http://studioriboldi.eu/userfiles/files/43519700119.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/dezarojunixaruwewetona.pdfIn PDF document text
    • https://cplastik.net/data/cms/file/vewoz.pdfIn PDF document text
    • http://asremajazi.com/uploads/files/vazazukuzebama.pdfIn PDF document text
    • https://newegys.egyseg.eu/ckfinder/userfiles/files/18088663204.pdfIn PDF document text
    • http://wangguanhardware.com/userfiles/file/juzudis.pdfIn PDF document text
    • https://magnettoptan.com/upload/ckfinder/files/21811811453.pdfIn PDF document text
    • http://ajisushionline.com/uploads/files/sovak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=android+chrome+cache+viewerPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ae9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE9B 14748 bytes
SHA-256: 6b11112e32df77f963e64ee4186422b96d11a11511a01a03827833b11952a1dc
font_01_sfnt_off0000d3c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3C2 10456 bytes
SHA-256: 1891ebc85417e1bddba049f18d77b2a17330474429066496b3bed80951796655

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