Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7bdb67475575ec8…

MALICIOUS

PDF

69.3 KB Created: 2021-09-16 21:34:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9b7971efce07c41ac3e7ac64c5c4278e SHA-1: 441f85c8d2fbeeed78b216db2931890fa23af1be SHA-256: e7bdb67475575ec8f91e779e3ecfcf7d6dc4d27020d727deaf63f0308b95100c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a link farm that directs users to various websites, some of which are hosted on compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to lure users to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7457

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://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/4944f4df9b9a4b7cc8188acf244d4b5e/texovogalibomexo.pdf In PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/fff58a236586589443af25232b6f2ed0/33076406362.pdfIn PDF document text
    • http://tetrafluoro.com/upload/files/wokuju.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614139717ff30---94093385744.pdfIn PDF document text
    • http://gyermekhaz.hu/Content/site_images/files/54638728320.pdfIn PDF document text
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/dupodubalebi.pdfIn PDF document text
    • http://year-c.com/upload_fck/file/2021-9-4/20210904170627431920.pdfIn PDF document text
    • http://www.portaldasfreguesias.com/portugal/vianadocastelo/vianadocastelo/geraz_do_lima_sta_maria/ckeditor/ckfinder/file/jumufoxid.pdfIn PDF document text
    • http://webmba.fr/client/logo/file/kakazipipiwezisaluv.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/71215674572.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f480924cbe---36493419886.pdfIn PDF document text
    • http://escritacontabilidade.net/fotos/news/file/65373453978.pdfIn PDF document text
    • http://weighlessthisyear.com/ckfinder/userfiles/files/bevuguzekotamebu.pdfIn PDF document text
    • http://jeyadhurgatemple.com/userfiles/file/wikikadofejigijuxa.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa9219da24---951620385.pdfIn PDF document text
    • http://cdmvt.cz/sites/default/files/giduvepevixisetu.pdfIn PDF document text
    • http://nhatrangpalace.net/app/webroot/upload/files/segokifanupodebe.pdfIn PDF document text
    • https://bipalisdemo.dashindonesia.com/userfiles/files/vetuzobutolofinix.pdfIn PDF document text
    • http://basumati.com/app/webroot/ckfinder/userfiles/files/maxemep.pdfIn PDF document text
    • http://praguetransfer.com/files/file/34627513297.pdfIn PDF document text
    • http://tweddlefoto.com/files_contenidos/upload/files/2171126743.pdfIn PDF document text
    • https://rlmahtani.com/userfiles/files/lebibijuwarulupik.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/46875430124.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=the+tom+and+jerry+show+playdate+with+destinyPDF 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_off0000d83f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD83F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f051.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF051 17064 bytes
SHA-256: a413541340a394efa1778978205eff9879ebe5de606a909b86e2ad42fb936adb