Malicious PDF — malware analysis report

Static analysis result for SHA-256 c63984f8dbce2f54…

MALICIOUS

PDF

84.6 KB Created: 2021-07-02 01:20:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 16573a9c71dc78973092db36843fafd2 SHA-1: c996af0e45c1a0787f57cc98d1557fa80ec9e019 SHA-256: c63984f8dbce2f54f140e95bbc107dac7b7d5949fffe3c3fe41a7845494bd20d
154 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting it's used to distribute malicious content or phish users. The embedded URLs, while some are marked benign, are part of a larger pattern of redirection to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6120

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.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/0guieo05va13qd4q0svmpni803/pitiwo.pdf In PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/bjl5buiu7s7q4a7cu6ge5i6kr7/77307540943.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/9c43c0033310016296a4a4e892f0a498/32539298557.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbe4187b60d---nozon.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/53897ud69n26e8k41eolr87jf5/66464906052.pdfIn PDF document text
    • http://madveras.com/ckfinder/userfiles/files/paxarodomelufuregawab.pdfIn PDF document text
    • http://bulongvungtau.com/media/ftp/file/68897750648.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/07b18ab212267f21e0e3af8ee9a26aed/82134368492.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081b3af174be---20558565310.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ceb46a088a---fokojiberires.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bac1bc10b0f---rubuloninomarelavelog.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/sf6cbiuvcf79uf7im066da4pec/65734032355.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/25934761804.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/rowofazij.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/2cncksurnb3v46hmvkv4v91821/51577366556.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/2320082555.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/12765077905.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/b033ddd5603cd5fbff7110b93c0d803d/dinajuvibukamo.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c00096a0426---bafazobagebufuzoripoko.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210601_317A62ACD9AE6A25.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/24bd1794fc3ab9b96117aa13e9c696c6/bipaxafux.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607d40581364c---56398596964.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/059172dbb84e134788286a876690c693/gilopoki.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/bibitowazaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=how+to+cite+a+song+title+in+textPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFD 10484 bytes
SHA-256: f43ce53e90ac736537b3f5da0ed06de98c01805c542fb1924ce082268dfb84b6
font_01_sfnt_off000105fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E0E 16628 bytes
SHA-256: 45380fb9c3273dbff9b58c05d3c376748b6e74be4581952706bc920728196f14