Malicious PDF — malware analysis report

Static analysis result for SHA-256 66815d9431396e2e…

MALICIOUS

PDF

76.1 KB Created: 2021-09-24 16:42:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f584ac69fbdf4896f6dab98a47a8f9b7 SHA-1: b8a328582e479b3f2904e1d213ac69cb815e75e5 SHA-256: 66815d9431396e2e27fcfaa6ebee5e6b464896d7c3090f4cbacb8969582d78e2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and a large number of external links, many pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate the redirection to these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://allytemp.ru/uplcv?utm_term=madagascar+espa%C3%B1ol+latino PDF link annotation
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614137b89b340---16208121026.pdfIn PDF document text
    • https://htijsr.com/userfiles/file/rosaduxujepak.pdfIn PDF document text
    • http://underbutter.cz/download/foto/91760002767.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614468f64d979---36282483573.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/jilekatogokadem.pdfIn PDF document text
    • http://saga.diamonds/uploads/ckfinder/files/dodug.pdfIn PDF document text
    • https://regiefranchet.fr/userfiles/files/panewaxukizejimewalifa.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b42c330754---letunitezareruzexexeg.pdfIn PDF document text
    • http://libron.pl/fckupload/assets/file/72996902902.pdfIn PDF document text
    • http://cnsgafgl.netsociality.com/upload/files/8554019128.pdfIn PDF document text
    • http://nbmounts.com/userfiles/file/1631396039.pdfIn PDF document text
    • http://area100impianti.it/userfiles/files/fonuval.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/16130daf48697f---42159363078.pdfIn PDF document text
    • http://lsphc.com/userfiles/file///fejonisejifosobir.pdfIn PDF document text
    • http://mrs-edu.com/sribati/editor/uploadfiles/waruviv.pdfIn PDF document text
    • http://kapsalonindex.nl/images/uploads/27128232664.pdfIn PDF document text
    • http://technoauto.jp/js/upload/files/dodikiv.pdfIn PDF document text
    • http://naturenhuman.com/app/webroot/userfiles/file/92043228758.pdfIn PDF document text
    • https://0955205219.jwa.tw/userfiles/files/90554160753.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/76853987270.pdfIn PDF document text
    • https://konzolstudio.ro/uploaded_files/file/jusefupo.pdfIn PDF document text
    • http://ever-pioneer.com/upload/files/43012969972.pdfIn PDF document text
    • https://birgatour.mn/js/ckfinder/userfiles/files/kirupawitidusoxejowaj.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bd5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD5E 10888 bytes
SHA-256: 07f1ff2a630e28aca1a71b621fb4534600429ded2b62ec7665e7514bd1bf3ffc
font_01_sfnt_off0000d62e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD62E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE40 19600 bytes
SHA-256: 4d57e00ca964ccecb3a8ba60100ec631c9903b0207d8bb3892a32f066bc8b153