Malicious PDF — malware analysis report

Static analysis result for SHA-256 90823bb18eb991df…

MALICIOUS

PDF

67.9 KB Created: 2021-07-16 22:03:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0305a2b98bbba57443982565b13275c9 SHA-1: ac805482240ab15b4ad279072c2f37272082c32b SHA-256: 90823bb18eb991df24e6d95ad29e7f826ede3e980181b22022a729bb6c233399
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features numerous external URIs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6960

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 http://ebslang.net/_UploadFile/Images/file/98005401693.pdf In PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/7771ae66ec71824bfda73e2ea08cc323/70035264219.pdfIn PDF document text
    • http://chupanhnoithat.vn/upload/files/29938886137.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/jeroneserorazikoke.pdfIn PDF document text
    • http://al-farh-iq.com/upload/userfiles/file/29022535400.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/25492413749.pdfIn PDF document text
    • http://alexanderjamesbackcatalogue.com/userfiles/file/35867013981.pdfIn PDF document text
    • http://wo-kop.pl/userfiles/file/fafofewalinira.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160945c15980a3---45919363697.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/puvamujulidezetalomi.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/kcfjr9cl8sh9inf1ef297fg6i4/39913278279.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160770fbb10803---batuninepukogabaz.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/liwotoraru.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/65926011634.pdfIn PDF document text
    • https://anaksemut.com/contents//files/lajutapoderexiguwajorix.pdfIn PDF document text
    • http://tfforming.ru/d/files/40651123402.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/266c99666b07c16fea8bab6e452ec83d/fetaxoliwulimawurame.pdfIn PDF document text
    • http://giustizianuova.it/userfiles/file/berilinagem.pdfIn PDF document text
    • http://1137.jp/app/webroot/js/ckfinder/userfiles/files/sewur.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eb3d5165bc---zerifegebirekinek.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/37392037268.pdfIn PDF document text
    • https://bloomeng.com/uploads/23480842461.pdfIn PDF document text
    • http://www.mananthavadynorbertines.org/www/js/ckfinder/userfiles/files/muwafudugokonavub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=jump+off+the+pagePDF 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_off0000d519.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD519 17552 bytes
SHA-256: f8df7526a6202ba71d072ab63e92c1583470d434af9e5cb0d9ca89eddba1b2cb

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