Malicious PDF — malware analysis report

Static analysis result for SHA-256 40fb43646bb4198c…

MALICIOUS

PDF

64.1 KB Created: 2021-09-15 22:21:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: cd0a8322b6266ae8d946efcb371c08b8 SHA-1: e078c9b929c4f27d5733520b043dfb46ba904036 SHA-256: 40fb43646bb4198c4967bb1b7f57c2ac0f6f83d4fea81297607930d016ad8fa9
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to redirect users to malicious content. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing lure, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5692

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://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/1rjh5vtsfk3gtenivfdcau6o5j/9084766750.pdf In PDF document text
    • http://ajej.pretty-match.com/upload/files/87295045443.pdfIn PDF document text
    • http://asr-net.ru/uploads/files/52605397360.pdfIn PDF document text
    • https://daqing-jewelry.com/uploads/files/202109042018234867.pdfIn PDF document text
    • http://costruzionibulagna.it/userfiles/files/71974346104.pdfIn PDF document text
    • https://10glazsikeyrosa.ru/file/64059288081.pdfIn PDF document text
    • http://ccsilver.kr/files/fckeditor/file/12296801756141dcae35056.pdfIn PDF document text
    • https://shidoremicrosys.com/media/palujiz.pdfIn PDF document text
    • https://at1-turbo-j3t.com/contents/files/pekerironowiduwisafegezu.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/54722962310.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/qdm37f8guv85ld7591grrq2gku/lejegoxujexanegorovon.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/vitijubefalejimu.pdfIn PDF document text
    • http://mail.teleserviciomalaga.com/ckfinder/userfiles/files/bizujujonep.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/32093532460.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/zikezo.pdfIn PDF document text
    • https://people11people.com/uploads/File/mozaw.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/68684534862.pdfIn PDF document text
    • http://cuanhuaabshanquoc.vn/files/zakikipumozot.pdfIn PDF document text
    • http://hotechike.com/files/files/filapazebekeneduruzipofa.pdfIn PDF document text
    • http://goodlife88.com/uploads/files/62674557305.pdfIn PDF document text
    • http://hotstamping.pl/files/file/wobudavulop.pdfIn PDF document text
    • http://roletyhanarol.pl/files/file/tufopujezotegenar.pdfIn PDF document text
    • http://sprinter-lab.ru/content/File/43198335569.pdfIn PDF document text
    • http://tunecharts.com/userfiles/file/josovawonujamalerugepesap.pdfIn PDF document text
    • http://belgium-ex.com/images/blog/file/lugitararizu.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613764f9e0767---27887891040.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=dazz+cam+ios+apkPDF 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_off0000d810.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD810 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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