Malicious PDF — malware analysis report

Static analysis result for SHA-256 840617aa3c1cbdd3…

MALICIOUS

PDF

79.6 KB Created: 2021-08-27 17:46:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 800004ea3945f2d40cedfc23c4812f03 SHA-1: 8ca01ff22149dcc4af533b5a987d41d3434823c1 SHA-256: 840617aa3c1cbdd3ff3b635253a2fab4e7a54041c8563a94f86c8a52b6dabe8f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites and disposable hosting. This structure is indicative of a link farm designed to distribute malicious content or facilitate phishing attacks. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 http://website-design-company.in/dev3/damodar/ckfinder/core/connector/php/userfiles/files/ganibabirezip.pdf In PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a5707ce2e87---wuxuxopusurirowima.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/poxipobedalepojexagifibos.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c794dd4b4a---40456286283.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608142cdbdbd7---900288841.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9f5edd2d32---10810669315.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/d46bc4dcec334861d4b8138ae30e013d/mexobejovowetefefikub.pdfIn PDF document text
    • https://bartonsteel.com/tony/barton/ckfinder/userfiles/files/nipefepok.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/203fb7b5c65fb0a8e9e1148926fd6c53/xijodoje.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/c3h6o6o1vgsknhambif7utf901/wipeduzubeg.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160a7b0507971e---menulufotuwedadutiporasab.pdfIn PDF document text
    • http://anchor-m.com/js/upload/files/44005858214.pdfIn PDF document text
    • http://alpinist.store/sribati/editor/uploadfiles/joledomumoxamironijez.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608263893110a---vexuw.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/36876001637.pdfIn PDF document text
    • https://minhkygroup.com/luutru/files/mejiguxixaxiwed.pdfIn PDF document text
    • http://imobiliariaimperio.com/files/files/lalekekeginiwusexu.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a33a366d493---36932815570.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/e33c1fefb4c498117f1e1da2920050e5/79075177582.pdfIn PDF document text
    • http://10glazsikeyrosa.ru/file/55793732925.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/56akd36p1ujcir108u19gq48e7/lapirifewafefa.pdfIn PDF document text
    • http://kccmaul.com/files/files/pebodog.pdfIn PDF document text
    • http://www.tahi.hu/ckfinder/userfiles/files/43890081260.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/8889261576.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/ksiu5g0q44b017oa0hd8f4i2a1/1279654436.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=varicella+zoster+and+shinglesPDF 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_off0000d5f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F8 16044 bytes
SHA-256: dddbea8fafdf0859bebc8879c64250bb7668d3a63f73fecf8e305033b98f949a
font_01_sfnt_off0000ff61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011778.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11778 10676 bytes
SHA-256: b3461218138f761896f86e739024dc53f7c8625c2fef912c0a3e3f0ca7b44475