Malicious PDF — malware analysis report

Static analysis result for SHA-256 a26574cc66b1e248…

MALICIOUS

PDF

66.5 KB Created: 2021-10-06 18:08:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: a1e54db4b934b1f449d13e1a2a5d9999 SHA-1: e2848a3b5176d6bbe5c737c8bd99aaebdf8c1496 SHA-256: a26574cc66b1e248fdec7e1bc5ddecd5d7751b3016efd8b4f60f71bcd669ee61
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating a phishing or trojan threat. It contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8255

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crewmak.ru/uplcv?utm_term=valkyrie+drive+gameplay PDF link annotation
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/c6344441a3caa0b9e7c6513af64014ad/niwodixut.pdfIn PDF document text
    • http://dade666.com/userfiles/202110file/2021100521182070554.pdfIn PDF document text
    • https://tapetcenter.ro/app/webroot/files/userfiles/files/tukiledobarawekugam.pdfIn PDF document text
    • http://ngocphuocjsc.com/public/default/ckeditor/files/letijaxekaxotarav.pdfIn PDF document text
    • https://frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/54041319784.pdfIn PDF document text
    • http://air-con.ru/upload/files/laxejekesixatunerev.pdfIn PDF document text
    • http://beauty214.com/uploads/files/202109110242555791.pdfIn PDF document text
    • https://www.theoakshealthcare.com/my_content/js/ckfinder/userfiles/files/7468310324.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138730422827---vuroduwexemilup.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/da1674a5ec3120ce178061e0aa6a0979/xozajiwofojuso.pdfIn PDF document text
    • http://snabsz.ru/ckfinder/userfiles/files/fajuputu.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615b6643b36cd---guzis.pdfIn PDF document text
    • http://studiopiergentili.it/userfiles/files/41349550412.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/nowanok.pdfIn PDF document text
    • https://kidneystonetreatment.in/userfiles/files/xivebomagaxupiwut.pdfIn PDF document text
    • https://namkhoasaigon.vn/web/images/files/mutujabatowugeb.pdfIn PDF document text
    • http://fratellilongoni.com/userfiles/files/25293738677.pdfIn PDF document text
    • https://ikansambel.com/contents/files/vogaburisarolupiraxejanev.pdfIn PDF document text
    • http://www.deewanalarab.com/up_imgs/bekozuzude.pdfIn PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/mexalike.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/161543987e4065---2832589610.pdfIn PDF document text
    • https://ashleymongolia.mn/uploads/files/15035350392.pdfIn PDF document text
    • http://kuresi-kaitori.com/upload/content_pic/files/73097287914.pdfIn PDF document text
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/pidivuragukaregikimew.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_off0000d9b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B7 18260 bytes
SHA-256: fa53f0af6337a4b5f0c4d3bc52670b160b9852cf784520edf3e4fd325e02bcd2

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