Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e545e3cfebd32c7…

MALICIOUS

PDF

83.9 KB Created: 2021-09-04 06:20:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d7a05dd7d433142def4aa12284938158 SHA-1: 3167a306d8853db4e561feeef9ae1d09c2c02eff SHA-256: 3e545e3cfebd32c74278fadde5244a07a11b97eb49d3fa980e03a894e3a410ce
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous links to external sites, many hosted on compromised CMS uploads, suggesting a link farm designed to redirect users to malicious content. The 'SE_INVOICE_LURE' heuristic further supports the phishing pretext. Although no scripts were explicitly extracted, the nature of the links and the ML detection strongly suggest the PDF is designed to lead users to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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 http://karunb.com/UpLoads/files/98216859344.pdf In PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/2gjidaae6ll2bq61n156vkj8hp/zexifowoxalojose.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/0mu1jhfdv4uski44gb6n0e7tn8/donefonudizezowopujet.pdfIn PDF document text
    • https://sukaunited4d.vip/contents//files/lunibunamuduzinufij.pdfIn PDF document text
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/32220107216.pdfIn PDF document text
    • http://www.bmo-agencement.fr/ckfinder/userfiles/files/63699827824.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/o328toa0qhdib3ldbg559qq218/52938942162.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/1608a01947ede6e9de0dff87ce87bc1b/63259577947.pdfIn PDF document text
    • https://x-software.cz/data/file/ferapegadapavod.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4d52506da---11877026485.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/d4cf19a991fd1f4420fe222c99b7e1a0/50138122835.pdfIn PDF document text
    • https://prolocolidodisavio.org/ckfinder/userfiles/files/nugedixa.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160fde2ce038a8---natiwoxire.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/buwodidowavexifeju.pdfIn PDF document text
    • http://mishelik.ru/userfiles/file/31694450685.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/bulesu.pdfIn PDF document text
    • https://kompaspt1.com/contents//files/43422762635.pdfIn PDF document text
    • https://fleuriste79.fr/ckfinder/userfiles/files/pijesolalasesigavanipazu.pdfIn PDF document text
    • https://giverny-bkk.com/upload/files/vipamon.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b55af52bfbf---16535904538.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/30618440257.pdfIn PDF document text
    • https://fceresources.com/ckfinder/userfiles/files/71593802660.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/8bb2d29d203c0433e2e78b375903927e/kevijikevilobetekita.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a8bac8dfb---57582808691.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/e428i20nuiaim4a9bi0v0qal80/bowulefi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=javascript+code+to+generate+pdf+from+htmlPDF link annotation
    • 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_off0000e064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE064 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f87b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF87B 11124 bytes
SHA-256: 3a44ecf6ddc98f345414c6325722dcfc2e75b486b0ee4ab75f0d09a7dcb9db52
font_02_sfnt_off0001120a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1120A 18220 bytes
SHA-256: 835b7aa5d68fc834c8a94b2e3d231edf378aacbd5acc576ac81513af902dc5cd