Malicious PDF — malware analysis report

Static analysis result for SHA-256 1dc218411fe29aef…

MALICIOUS

PDF

62.4 KB Created: 2021-09-18 08:03:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9d8b8905f6a0078ee0fa6f13a4058f5b SHA-1: 794dfb30225d80eda769082fcbbdc710189f0065 SHA-256: 1dc218411fe29aefdc8d2ebb39d9f084da5e8842d1d0252ecfb62cca014ea357
154 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to external websites, many of which are hosted on compromised CMS platforms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure itself is designed to lure users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7587

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://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/058424edd0cdd599b78921fd9d3080b0/xupukokukupe.pdf In PDF document text
    • http://unionnutritech.com/upload/files/xivap.pdfIn PDF document text
    • http://fnathservices.com/upload/file/74571740426.pdfIn PDF document text
    • http://studiotecnicopinto.it/userfiles/files/30776603296.pdfIn PDF document text
    • https://lederstuhlshop.de/ckfinder/userfiles/files/nozowakosumoxanizef.pdfIn PDF document text
    • http://hfnhsw.com/upload/files/25926826033.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1614433704c3ab---lokopotojesibadekuzom.pdfIn PDF document text
    • http://arcenevents.nl/site/upload/files/66854076563.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/k7dba152o1auecugqqau96knid/sujipeboguxiwu.pdfIn PDF document text
    • http://www.cpnatacao.pt/backoffice/ckfinder/userfiles/files/36099019722.pdfIn PDF document text
    • http://konstruktor33.ru/app/webroot/files/files/17593544596.pdfIn PDF document text
    • https://aspirans.com/files/file/bifeninisax.pdfIn PDF document text
    • http://mweb.cz/images/file/koxavuratogopag.pdfIn PDF document text
    • https://sreekanakananda.com/ckfinder/userfiles/files/zokikigamekowofikirujol.pdfIn PDF document text
    • http://mcap.cz/images/uploadedimages/file/jebapegedun.pdfIn PDF document text
    • http://sreema.org/FCKeditor/file/kizikuleraguna.pdfIn PDF document text
    • http://quantri.thaisonpalacehotel.com/upload/files/88979296851.pdfIn PDF document text
    • https://mgrenginiai.lt/ckfinder/userfiles/files/74969877301.pdfIn PDF document text
    • http://bobhendrix-law.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/61417225570.pdfIn PDF document text
    • https://aneri12.eu/res/file/92404620179.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/23523521410.pdfIn PDF document text
    • http://viettelhaiphong.me/data/dulieu/files/57176278478.pdfIn PDF document text
    • http://obkladacstvikolar.com/content/19749953189.pdfIn PDF document text
    • http://855solution.com/htdocs/cljr/data/files/semabupuvu.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/41651278731.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=h+dictionary+wordsPDF 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_off0000e31b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE31B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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