Malicious PDF — malware analysis report

Static analysis result for SHA-256 15cf6545dcd80b3f…

MALICIOUS

PDF

72.1 KB Created: 2021-06-08 19:20:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: af6afb6d16d5094c915d5c84ce5920c1 SHA-1: 70c156c5f1581c6d46f2380f89ffd992df1fe59c SHA-256: 15cf6545dcd80b3f0c2d4c9c689d892b671f3fdfbe71e54f25d729a61f5a454b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7772

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://queure.ru/uplcv?utm_term=tiger+zinda+hai+movie+download+moviescounter PDF link annotation
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/b0lacvq634d2tv1m4bsiocpuf7/rukununevetutomu.pdfIn PDF document text
    • http://bioterapiazabiegi.pl/obrazy/file/4768452900.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160846709e8871---kuxexebekapukege.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/cdb6a7bf249a03d1fda3b27c04badb91/58554874010.pdfIn PDF document text
    • https://abeess.com/userfiles/file/77723077050.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/23268079151.pdfIn PDF document text
    • https://hiampelectric.com/wp-content/plugins/super-forms/uploads/php/files/950f8270341bf239b4cae4d4fcdc254a/42767437447.pdfIn PDF document text
    • https://wecareu.net/ckfinder/userfiles/files/runupi.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072947d7cc20---85692934674.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608003dee65d5---sitojidonuruso.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/sududo.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/eage9gemc84akt1tnlq7k84qj7/mexadinomuwuwajo.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/wunobivil.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16083666a7954b---66514396806.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/8dde11a6e7a7d25a3cb39aaeaa1f5e35/80351528881.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0e8770362---313579900.pdfIn PDF document text
    • https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/57061185171.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000effd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFD 5504 bytes
SHA-256: 9a9c7482d21fe52bdc2e95993000a25004f882afec317c66b0d1dcd9d6659d87
font_01_sfnt_off000102a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A8 3720 bytes
SHA-256: 40ef96da86b6123d577d475be460de15c41b9ca7393a8e650be4e9942aa3c64b

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