Malicious PDF — malware analysis report

Static analysis result for SHA-256 13459e668ab443de…

MALICIOUS

PDF

92.8 KB Created: 2021-09-08 06:48:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8dfa331f3619a5f4b194f6cc4a89cfca SHA-1: bcc08985f23e4aa7c79910b59e2bc0fc587387b6 SHA-256: 13459e668ab443dea775a63335bd35b47dde9862dae9dfba0bb4973843afad4b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, many of which point to websites hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The primary attack pattern observed is the use of a link farm to direct users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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.
  • 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://argol-editions.fr/userfiles/file/78787905123.pdf In PDF document text
    • http://ndt-tl.ru/upload/file/gomutofapigagiritalob.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/vonigunumigarafev.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/lixuzepafofolimubawaxawek.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c707174f0a6---3068989250.pdfIn PDF document text
    • http://splogservice.ru/content/file/76679621756.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/av6rsg2ak52jr3k1n2848apdq6/mamabovizisipa.pdfIn PDF document text
    • http://clinicaveterinariagussago.com/userfiles/files/35413665566.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/6itcmg20b6hfa8udsppte1e9tv/37550709342.pdfIn PDF document text
    • http://chromavials.com/d/files/xoponizaridukelo.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bfa0920f79---84957601456.pdfIn PDF document text
    • https://novamakine.com/upload/ckfinder/files/24200781719.pdfIn PDF document text
    • https://abhrian.com/userfiles/files/3271856584.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/6f233a9a905077fef0ea4c3e265192ce/93238935955.pdfIn PDF document text
    • http://magooferta.pl/uploads/fck/file/84147375041.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/16071626cc6287---7165885191.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/bp9nps33uugkafov1sv880gk78/favoxugexotuj.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/4eifhnitbjqcvg1otaepd18asm/97640479121.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ccd5823fb3f---60243818531.pdfIn PDF document text
    • https://www.hermanosvalerorecio.com/ckfinder/userfiles/files/sulol.pdfIn PDF document text
    • http://nagymester.com/userfiles/file/37416540409.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210619171811_664911320.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/161362b3f7e2fe---5279261731.pdfIn PDF document text
    • http://candientu24h.vn/webroot/img/files/fovalajezogotos.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160aaf58dcdd02---92954831690.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=laporan+pendahuluan+infeksi+saluran+kemih+pada+anak+pdfPDF 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_off00010860.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10860 16952 bytes
SHA-256: 5cc244f0bffc52e27b76d82077c245f5e62dbf9f963270230d7c335541e655b2
font_01_sfnt_off00013414.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13414 10816 bytes
SHA-256: 898a95bb886bc74f558ef31df42c89d21d2f4b93c669314c4bd2dfb566a5d48f
font_02_sfnt_off00014cb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1