Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc314486c9d0318a…

MALICIOUS

PDF

62.5 KB Created: 2021-08-22 03:54:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 451a3dc3c4763d9a7d0cfbac2c297ce1 SHA-1: cbe62c33818d4cd9a12f05c628927eba98af1534 SHA-256: dc314486c9d0318ae0c85936667ec514ece60f9bbb429e6fe07f006de2c9a35e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as malicious by ClamAV and an ML classifier, indicating it's likely a phishing or malware distribution lure. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests these links are intentionally scattered across disposable hosting to evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7151

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://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/b4644d041dde146e0acd23c15727a57f/49487195724.pdf In PDF document text
    • https://greenline.bg/userfiles/file/pozumagexenujavemotepad.pdfIn PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/kanumonasiziveno.pdfIn PDF document text
    • http://chinoboxingclub.com/clients/36032/File/36611571776.pdfIn PDF document text
    • https://hoangnhataudio.vn/media/files/nunigatane.pdfIn PDF document text
    • http://antitumor.org/filespath/files/20210820031252.pdfIn PDF document text
    • https://sambelteri.com/contents//files/93368528287.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/58238457075.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/aae88996322b363af9d696caa217e6e9/30258943689.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b46f5fe89b1---70582480976.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/4324897085.pdfIn PDF document text
    • https://knoxvilleremembers.com/media/takufumubitimurutafevizek.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/ab4303d8a5161d1fe97e60c3a6265896/wimaguzeduvu.pdfIn PDF document text
    • http://www.pics4us.de/userfiles/file/72362010656.pdfIn PDF document text
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/makukizivep.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/51682048614.pdfIn PDF document text
    • https://mangonebike.com/uploads/file/12626959208.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/3ae57077b9f09251ab38ef2777b63311/filopubajozevi.pdfIn PDF document text
    • https://bloomlight.pl/_bloom/file/lexolixefumukerevor.pdfIn PDF document text
    • http://heydarbaba.org/resimler/files/tizerujeguganiveniwut.pdfIn PDF document text
    • http://demirlermetal.com/resimler/files/35817520393.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/6acb2216dc276753c89588403ba2184d/xagezipaxukakuxase.pdfIn PDF document text
    • http://travelport.pl/userfiles//file/betibafila.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608676af4dc68---xibisux.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084364587366---molezimimi.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/18848203532.pdfIn PDF document text
    • http://www.climatisur.com/ckfinder/userfiles/files/71623821755.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/42e56ce78be09ba4f0d4bc09c07481ab/sotewogutoliwoniw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=telefono+tienda+almacenes+el+canalPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE38 18332 bytes
SHA-256: 97cdad6c2e1d5fe56fc4ff91087f0c4c2bae765d8ba15bf66392317065140454