Malicious PDF — malware analysis report

Static analysis result for SHA-256 841420869a27a40a…

MALICIOUS

PDF

67.8 KB Created: 2021-09-22 13:36:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d73c5ca745d47621c379519d29eabfc7 SHA-1: 87aae9cee1333508a4128342d29ee49801813fe9 SHA-256: 841420869a27a40a04ae9db1b0e0af4baa47efb028af498a9fef81447170823a
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, indicating a phishing or trojan threat. It functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The presence of external URIs and link farm heuristics suggests an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8341

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://crysiq.ru/uplcv?utm_term=piano+apk+free+download PDF link annotation
    • https://mimpishiodua.com/contents/files/durawaremovuxawotu.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/cf52d1c6fcb0590e67994f5336392879/90561494570.pdfIn PDF document text
    • http://studioschicchi.eu/userfiles/files/17417306189.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/93014714752.pdfIn PDF document text
    • https://jeevandeepspecialcare.com/ckeditor/ckfinder/userfiles/files/soranurilexezesuk.pdfIn PDF document text
    • https://glamweddingdesign.com/userfiles/file/67593673061.pdfIn PDF document text
    • http://engcaphone.com/_UploadFile/Images/file/95015264099.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/9f8c3771ef8e1e2789f7ead82ee4b6f3/tilezal.pdfIn PDF document text
    • http://www.sczct.com/up_files/file/30288567154.pdfIn PDF document text
    • http://hnfhdc.com/UpLoadFile/2021091813122890859.pdfIn PDF document text
    • http://personal.sut.ac.th/chantira/port/ckfinder/userfiles/files/bekoraradog.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef39dcc876---mulumuxoki.pdfIn PDF document text
    • https://lensprovn.com/ckfinder/userfiles/files/28150010075.pdfIn PDF document text
    • http://andersonlawdecorah.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/40551873760.pdfIn PDF document text
    • https://pre-www.bridge-college.com/uploaded/ckeditor/files/34973582024.pdfIn PDF document text
    • http://wintec-samu.hu/uploads/files/zopozadusafugasipixi.pdfIn PDF document text
    • http://westernstudioservice.com/admin/userfiles/file/66009784701.pdfIn PDF document text
    • https://anandamsanyal.com/userfiles/file/54769839520.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16147ef70097b1---98524331891.pdfIn PDF document text
    • http://winterwonderlandzundert.nl/uploadimages/files/pazaru.pdfIn PDF document text
    • http://www.udelimpa.es/ckfinder/userfiles/files/38858095036.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/wowonuvidit.pdfIn PDF document text
    • https://bomnuocebara.com/quangbasanpham/app/webroot/upload/image/files/72148690108.pdfIn PDF document text
    • http://isagenixmakessense.com/ckfinder/userfiles/files/79323659627.pdfIn PDF document text
    • http://xn--80adic7alej3d.xn--p1ai/userfiles/file/18011178126.pdfIn PDF document text
    • 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_off0000df4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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