Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d95093d79339bb5…

MALICIOUS

PDF

67.8 KB Created: 2021-08-16 00:54:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 64e61c47720b4d37f0ed6ff180a5d064 SHA-1: 368bd3157b9371112289d819346aa93dbff52505 SHA-256: 2d95093d79339bb5a54b4be7ca6c19bf2ef81ee929b1988f3c480ab24bd575ab
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm with numerous URLs pointing to potentially compromised websites, indicating an attempt to redirect users to malicious content. The ClamAV detection and ML classifier further support its malicious nature, classifying it as a phishing trojan. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific purpose beyond the presence of external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6158

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://malopolskiszlakwinny.pl/upload/File/fozetufimakobiledav.pdf In PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/18cfe65af36de6e1362f7754bfa07e2d/damutegof.pdfIn PDF document text
    • http://ohmytour.kr/FileData/ckfinder/files/20210707_0FE5486D944FF541.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/91432691139.pdfIn PDF document text
    • http://stellar-toys.com/ckfinder/userfiles/files/5926031963.pdfIn PDF document text
    • http://argol-editions.fr/userfiles/file/jakoduwofavegez.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a1cc522fc64---10685952586.pdfIn PDF document text
    • http://fecoil.com/userfiles/file/57571653180.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074727ebe3b0---jazinewazixa.pdfIn PDF document text
    • https://digireg.es/upload/10192750892.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/zipasewuda.pdfIn PDF document text
    • http://profitoolinfo.ru/ckfinder/userfiles/files/wuzanupalado.pdfIn PDF document text
    • https://toskov-yordanov.com/userfiles/file/fobuweru.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091bbdb4aaf0---xiwamojevezinitatobik.pdfIn PDF document text
    • http://holycrossyouthministryasp.org/clients/f/fa/fa15eac34f6f8ef5a8ada011ffef1578/File/24464585422.pdfIn PDF document text
    • https://sjalikave.hu/pictures/file/24731985592.pdfIn PDF document text
    • https://ip-kamera-rendszer.hu/ckfinder/userfiles/files/58315326344.pdfIn PDF document text
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/nuu0ovnnqnufui48rcq4ninkdf/23017519398.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077c63923dd4---99835735542.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/letuvekeradolewisev.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609af7e4ca80c---9935624637.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/93d664b93f4aeb3b361c01e80969423b/50843311577.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/16103031e2bc89---sibevegivop.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/cfa9c0138e448f72f4b4d7ba7f663fe5/94558967794.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/gofaloxipiset.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=discrete+wavelet+transform+in+image+processing+pptPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c71c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC71C 16128 bytes
SHA-256: b540c5fc21c824361676eb1573fa47782f18e5f84ccbc0dfb43ff303a91830d2
font_01_sfnt_off0000f0ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1