Malicious PDF — malware analysis report

Static analysis result for SHA-256 a14f14c3c63b8ad1…

MALICIOUS

PDF

94.3 KB Created: 2021-08-15 10:17:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3dc66bd60267abc9519de65fae94c72f SHA-1: 7a269e3f3f9464f18b2517c353640027c6a046a2 SHA-256: a14f14c3c63b8ad1a29bee8246d9f629abb8ed0b8150f6a9ef2698f873bb96a1
124 Risk Score

Malware Insights

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

The PDF file was detected by ClamAV as a phishing trojan. Static analysis revealed it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The presence of numerous links, including those with 'utm_term' parameters, suggests an attempt to disguise malicious destinations or engage in SEO poisoning to lure unsuspecting users.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3836

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://www.pranabkumar.com/fckimages/file/wamezukekojutafiku.pdf In PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160758043ad6de---87160137062.pdfIn PDF document text
    • https://aymfly.com/aym_image/files/11520003674.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/45406401077.pdfIn PDF document text
    • http://www.gdchgs.com/admin/img/files/60226469085.pdfIn PDF document text
    • http://ceomit.com/fckupload/file/lujifup.pdfIn PDF document text
    • http://brainbond.ro/userfiles/file/87193723949.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/b0c6j8a50olainc3rcr9uvgri2/jisubiginiravenif.pdfIn PDF document text
    • http://kaushalacademy.org/ckfinder/userfiles/files/14517734392.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610fc49899f4d---1168673320.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210503044659_1703025066.pdfIn PDF document text
    • http://sinners-party.de/media/file/sisonazuvadotapewosaxu.pdfIn PDF document text
    • https://123natura.com/stockages/files/50176502490.pdfIn PDF document text
    • http://heizler.hu/files/file/gibonuwixadevutiwami.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d877a06247---binukumutoxesulemetux.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/c5304e088df6c141a07c5d4fc9f4ce52/domogop.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/41921388256.pdfIn PDF document text
    • http://onlineexpert.in/userfiles/file/99372692905.pdfIn PDF document text
    • https://guruamardaspublicschool.com/userfiles/files/retadiwuluwimemine.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16098b6c0aa732---74790336118.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/e2i3u04rr2dlaqec94m4tsbdu1/77327179340.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=irregular+verbs+list+pdf+cambridgePDF 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_off00013755.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13755 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014f6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F6C 10996 bytes
SHA-256: 73f85d5b2c71ec7bbf7c4627a76f10f2f221303280e5045016183dd55be5082a

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