Malicious PDF — malware analysis report

Static analysis result for SHA-256 b65e6a37ac46958f…

MALICIOUS

PDF

91.1 KB Created: 2021-08-18 17:47:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 24b4fa7106b177380c457349e5b6881d SHA-1: 808fd8d6eae0ad4a4a9d896eb600f9a8b2ca8a1c SHA-256: b65e6a37ac46958f13831934c174d065b9da88397fabb55f67741fa75d1b2934
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded JavaScript indicates an attempt to execute code within the user's browser or PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9866

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://bakwanudang.com/contents//files/35228611494.pdf In PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/vutavalokobudamub.pdfIn PDF document text
    • https://murten-hotel.ch/userfiles/files/22700858275.pdfIn PDF document text
    • https://ssekolkata.com/ckfinder/userfiles/files/73678791553.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16073464600998---vijar.pdfIn PDF document text
    • http://think6.net/ckfinder/userfiles/files/20210728025256.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b7112c24b9---10027684001.pdfIn PDF document text
    • http://davcpundri.com/css/file/73094790706.pdfIn PDF document text
    • http://umiyawoodworks.com/fckdb/userfiles/file/95111222158.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160dfc6043a1cd---6688907877.pdfIn PDF document text
    • http://fritz-fahrlaender.ch/download/firire.pdfIn PDF document text
    • http://www.depomatrial.com/file/wopikivasokawolo.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c28b4b74199---33392433303.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e865671b19---towavada.pdfIn PDF document text
    • https://www.hotelrestaurantmacarena.fr/ckfinder/userfiles/files/wusamijusaxemajelot.pdfIn PDF document text
    • http://artospace.com/pics/file/41882532728.pdfIn PDF document text
    • http://lesen-und-schenken.de/userfiles/files/xifelade.pdfIn PDF document text
    • http://autofactory-jin.com/js/upload/files/gibolavubaditaxif.pdfIn PDF document text
    • http://transporteslaplata.com/imagenes_web/file/82217918836.pdfIn PDF document text
    • http://sns.hu/_user/file/89831606715.pdfIn PDF document text
    • http://tasteofruraleurope.eu/upload/File/xitegozugiv.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/64005032075.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072a75972509---nikiwakogozunegojixuwalox.pdfIn PDF document text
    • http://artospace.com/pics/file/danufuzofisaludow.pdfIn PDF document text
    • https://bwawarszawa.pl/upload/file/1796539177.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/befibun.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/1e532408b1ffa33cfe515f20b2bde8de/92339933170.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=toad+headed+agama+lizard+carePDF 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_off0000feeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000116fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116FD 17252 bytes
SHA-256: 1e46d8ff0d287d89c8acedd5e579f2a5e98a54923089c314f83508992ce4a19d
font_02_sfnt_off000143ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143FF 10468 bytes
SHA-256: fd70abb1c677f9488a99349e18bc1d20f8fd216d2d3e1e5754eec4f2b2363b34

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