Malicious PDF — malware analysis report

Static analysis result for SHA-256 65f9e4f628dbdce5…

MALICIOUS

PDF

84.2 KB Created: 2021-07-24 03:15:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: f613274921eb27db09d1e6fd35e72bee SHA-1: c9136725d219dd7a08600feebcc917e01456605d SHA-256: 65f9e4f628dbdce59d326004f612cd8f9e0a813ea35b5856181e9a546a932b27
154 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress upload directories, indicating it's designed to redirect users to malicious content. The ClamAV detection and ML classifier further support its malicious nature. The primary function appears to be acting as a link farm to facilitate phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6130

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 https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091d626916c1---fogetexozulaxadutewib.pdf In PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/rc4ekptsfbnrgs00jge942t8i7/2917566224.pdfIn PDF document text
    • https://csn-alliance.com/data/files/tufemuvuvuxo.pdfIn PDF document text
    • https://menu2uplus.com/images/file/82939800723.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/f5ffec6f630fa05dfe4a4a411131f2de/zobidozumuzejefowak.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/b28f9958ec9d566f863753f424d1c599/71849524919.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc7e1bc274---tigedigumodubarene.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160831d395710a---6252595990.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/h78vpm2i0s21u22mvdnocheb47/sibumevisugifirixurux.pdfIn PDF document text
    • http://closehorses.com/userfiles/file/fowadakif.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e2c0fbb086f---karip.pdfIn PDF document text
    • http://prattsofdouds.com/clients/d/d8/d85aab9f4bcbae69c8358f7a9990a0b1/File/dizegobid.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bf35b66debd---davadalederu.pdfIn PDF document text
    • https://hardlineconstruct.ro/app/webroot/files/userfiles/files/54001506466.pdfIn PDF document text
    • https://kfk-dekoration.dk/images/uploadedimages/file/pavawabujezudapobopenunuj.pdfIn PDF document text
    • http://patroha.hu/file/raxumegelasagogutidexi.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec6e613071---silifexopurojef.pdfIn PDF document text
    • http://anpo.vn/upload/files/72152326713.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/wejotebipaz.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f270e027cf4---87005698541.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/27be83e422021be450bc62f396d9fe1a/39460606988.pdfIn PDF document text
    • http://klinok-saintp.ru/files/68518740010.pdfIn PDF document text
    • http://havefuntogether.com/image/upload/File/87601039984.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/ab17a926980437c5833113df1397986f/52594009187.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160749630d2270---45154955060.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=the+gentleman%27s+guide+to+getting+lucky+epubPDF 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_off0000f9a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A0 11304 bytes
SHA-256: e08f4175afa93a6f2e2f1bc6266ee43e18b7be5526464a670ec20884014dce83
font_01_sfnt_off000113a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1