Malicious PDF — malware analysis report

Static analysis result for SHA-256 c67aeab92baf65c9…

MALICIOUS

PDF

88.8 KB Created: 2021-09-01 00:27:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c68269769df755907ad891cb6f13f7d5 SHA-1: d72985f667580cbb77caea8ecd2ebbf8877083dd SHA-256: c67aeab92baf65c923a358f58aab68e590675485309c7272bd6b7930fca21f2a
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that point to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to phishing sites or download further malware. The presence of multiple distinct hosts and the use of UTM parameters in one URL further support its role as a distribution or redirection mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8446

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://castrolmintabolt.hu/images/upload/file/18990374210.pdf In PDF document text
    • https://kabelkyaobuv.sk/editor_uploads/files/90925102377.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/19c3851a28b9b09bcce40ad9cda85aa2/duzinozowamoge.pdfIn PDF document text
    • https://vico-domrep.com/ckfinder/userfiles/files/watamulila.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/jibefok.pdfIn PDF document text
    • http://ipceurope.com/assets/file/wolotokezitobok.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a3b80112e0---91397835026.pdfIn PDF document text
    • http://phutungvespaco.com/luutru/files/dolakavefebazunafa.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/4c8d69dee2ec457501ffc949c15c1f75/66315201552.pdfIn PDF document text
    • https://galerie-louise.be/userfiles/files/25593791779.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/7d7f442faacffb9ae685a56d0a8a6acd/pebuguwokidupedaw.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098cae033b73---wenixotuwegim.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1607db1afe6a7b---bitekep.pdfIn PDF document text
    • http://ainut.fi/userfiles/file/xevegana.pdfIn PDF document text
    • http://fuzoku-kyujin.jp/ckfinder/userfiles/files/mivosojegebuf.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16095aaa19b5b3---dovabowazixuxuxoma.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1610b62320e0bc---23144171353.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/1d7654a713082a9b5b1704faecf7eaaa/revetopivebakuperub.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/wimegexumid.pdfIn PDF document text
    • http://winkeleninzundert.nl/uploadimages/files/lemuvuwoxevivunaxutibisum.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3a6c9f0482---gapovebosowipepikutoxin.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160faafd1b4639---supifupafipeninikogugum.pdfIn PDF document text
    • http://sbkf.org/files/files/vagipiwugigelumimu.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1607f50ad344f7---12570146303.pdfIn PDF document text
    • http://hk-dcc.com/wp-content/plugins/super-forms/uploads/php/files/nbp5as76tu424tkjbrg1qljkmj/78682508509.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=sherlock+holmes+moriarty+seriePDF 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_off00010313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10313 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011b25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B25 19584 bytes
SHA-256: 0a96a871f1a9478857e2422babfc57a25a1ccb28108b997a86d1666b79614f93
font_02_sfnt_off00014d8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D8E 10672 bytes
SHA-256: 18ccb0ce29c54ea925a5f3a1c574649472bdc4dd3b1b12e5838858a42ff6cd50

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