Malicious PDF — malware analysis report

Static analysis result for SHA-256 3686b2f3270d88fb…

MALICIOUS

PDF

64.0 KB Created: 2021-09-04 10:19:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 89ae02d550251ca75e5e5d0403d430a8 SHA-1: 3f5b37d0cbe880c3e7a95b90ff3a0ddbfd317871 SHA-256: 3686b2f3270d88fbd8aac2538e7ed74a236d9aa8b66263a9f7c1ece0a3577c43
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing an embedded JavaScript stream and a large number of URLs. Many of these URLs point to compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or spam distribution tool.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9183

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://medvor.ru/uplcv?utm_term=management+competency+based+approach+pdf PDF link annotation
    • http://weforyou.it/userfiles/files/simexepabikur.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b37a2bb6bb1---bolarosojatizow.pdfIn PDF document text
    • http://nesthomes.in/userfiles/file/zeraxo.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c95b36b3e7b---50721179657.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/71333841402.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607077ccb3c8e---sizis.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/5gqb8n94uc11rttc534le9cjio/bodarolet.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/2uvq9jj7kuq8f19qlc18jcptv4/manafivenoxijepikudazak.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/89e5fddb4a878dd51e3162e10c243525/7648792001.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/13838b6257586712b7e3fafd4894a8ac/domanibitigonawun.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c9737d00d---ridabitoreveturawasovapa.pdfIn PDF document text
    • http://teamtrinity.net/trinitya/file/mojudabokosaluwupogowin.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/1d986a0d670f035f825cc2d8173011ab/mifog.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/0bek3iqfkse3tkb9un6dmk8st7/41729698714.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/96569792197.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084bb3166ba9---lesota.pdfIn PDF document text
    • http://dichvuwebsites.com/media/ftp/file/remozamifefamag.pdfIn PDF document text
    • http://thermogroup.ru/uploads/files/pubidufetogikomatib.pdfIn PDF document text
    • https://phuketwebstudio.com/ckfinder/userfiles/files/57914387183.pdfIn PDF document text
    • http://cesurmakina.com/userfiles/file/6354793340.pdfIn PDF document text
    • http://kurumakaitori-one.com/js/upload/files/gedotap.pdfIn PDF document text
    • http://domholidays.com/userfiles/file/pemuve.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160955259630e5---dabanokevaguripejemasusup.pdfIn PDF document text
    • http://vorne-sitzen.eu/pcms/content/file/25997949253.pdfIn PDF document text
    • https://livredart.com/ckfinder/userfiles/files/77998698858.pdfIn PDF document text
    • 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_off0000d007.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD007 17072 bytes
SHA-256: 6a316a87a128556d954306d71dcaf8bc8e79e10b375a75b02069423bd35ba884