Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3bc0b7c31b61e03…

MALICIOUS

PDF

67.9 KB Created: 2021-09-11 23:47:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 00a73fd256e667bc3e47844eb3c8026b SHA-1: e0c225b3a58b710cec0e103e85db878e58b7c863 SHA-256: b3bc0b7c31b61e03d7fab90f10ee683b69215194b8f5638db1eb2aaa208a1cc1
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external links, including one pointing to compromised WordPress upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to malicious sites, potentially for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8112

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://findmecakes.com/userfiles/files/lozifopepen.pdf In PDF document text
    • https://hongmao.tw/uploads/files/202109040232453684.pdfIn PDF document text
    • http://salamino.pl/userfiles/file/84486073261.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/k95i4u0hvabopm64t0hqqlgrj0/paxeru.pdfIn PDF document text
    • http://pazzo.jp/js/upload/files/53653956110.pdfIn PDF document text
    • https://camelcarpet.org/d/files/94177492099.pdfIn PDF document text
    • http://www.toptehnik.si/images/jibipiwaguniwutato.pdfIn PDF document text
    • https://farmacieitaliane.com/documenti/file/xedonuv.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/55e73lvggt8uvmbb1u6i7qsi50/suzemujodubireja.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/kuwokavatagakepukisizap.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/nirasatateg.pdfIn PDF document text
    • http://cissi.it/userfiles/files/bimakipime.pdfIn PDF document text
    • http://hai-bi.com/uploads/files/202109030148223422.pdfIn PDF document text
    • http://www.bc-arman.kz/ckfinder/userfiles/files/22226620010.pdfIn PDF document text
    • http://enewind.com/pliki/file/10924416947.pdfIn PDF document text
    • http://eot.mn/uploads/userfiles/files/60144298966.pdfIn PDF document text
    • http://vipnovini.bg/root/f/uploads/files/46458909040.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/60ff8436792107ee5a24747482479f4d/41764354768.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/49506773543.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137bf296111a---jidojanerariva.pdfIn PDF document text
    • http://vncdata.net/app/webroot/uploads/files/62830292170.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=lucky+patcher+old+version+downloadPDF 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_off0000e480.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE480 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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