Malicious PDF — malware analysis report

Static analysis result for SHA-256 fecd009c1bd3d1e1…

MALICIOUS

PDF

72.6 KB Created: 2021-09-20 13:04:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e3ed97b65aa073d37d89c7fcb2a339bc SHA-1: 3353d976f6eea056f621863d63a11332d377653d SHA-256: fecd009c1bd3d1e1e1dd88001d6c863b0d307508a47160b3f1b55bfbecd541ba
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users. The presence of embedded JavaScript suggests it may be used to further obfuscate the malicious redirection or exploit PDF vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://ketchas.ru/uplcv?utm_term=iphone+2+pro+max+price+in+bangladesh PDF link annotation
    • https://denizlihorozu.com/resimler/files/fomovujixexujeje.pdfIn PDF document text
    • https://mavibusiness.it/file/33243955806.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e3dfa58cee---4350637754.pdfIn PDF document text
    • http://enewind.com/pliki/file/86021040994.pdfIn PDF document text
    • http://quinta.cl/upload/files/15917798395.pdfIn PDF document text
    • https://gift2goa.com/ckfinder/userfiles/files/14728281751.pdfIn PDF document text
    • http://heathrowairporttaxi.website/userfiles/file/58381230008.pdfIn PDF document text
    • http://escrima-rlp.de/userfiles/file/26597687067.pdfIn PDF document text
    • http://ediljolli.com/userfiles/files/28545257138.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/5e232eb0463cabb8806b78fb930daf48/degaxusuputezevezomaso.pdfIn PDF document text
    • https://kueapem.com/contents/files/lemalezi.pdfIn PDF document text
    • http://www.radio-kum.si/data/files/tobegojububari.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/56383239682.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16131c85e77aff---68340704086.pdfIn PDF document text
    • http://taxfreepoint.com/file/82568359201.pdfIn PDF document text
    • http://isotope3.pm-ural.com/uploads/files/xutuxujezamerofegin.pdfIn PDF document text
    • http://tbeaindia.com/userfiles/file/57515925496.pdfIn PDF document text
    • http://stsmcc.org/www/js/ckfinder/userfiles/files/luzeduvusenewe.pdfIn PDF document text
    • https://ms01bet.com/contents/files/40854004965.pdfIn PDF document text
    • https://vietrocknet.org/app/webroot/img/files/79013148450.pdfIn PDF document text
    • https://apotekatia.ba/fajlovi/32496692506.pdfIn PDF document text
    • https://diarch.in/WYSIWYGImage/file/gaxerugomopetok.pdfIn PDF document text
    • http://s4l.vn/storage/ckfinder/files/40160561928.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_off0000b620.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB620 17268 bytes
SHA-256: b338377ddc1ebbddf62c3476c6056ad0fc0ef4883cad5b712d35f4aa91c40bea
font_01_sfnt_off0000e305.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE305 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1C 11176 bytes
SHA-256: d20a85958905f89b55fabc7703fb1f53ed55a94d2b34307d3027bfb651fe98ee