Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc35b47b747be4a6…

MALICIOUS

PDF

91.4 KB Created: 2021-09-06 19:16:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 80ffd7bfa79c85d86fbb486e43c1b042 SHA-1: d6b86bb8bdcdda342cb71ca59764451bf5c5c0f5 SHA-256: cc35b47b747be4a67e08685f973da61e1a125c927d37d9fc2064211e39cf6a71
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a significant number of external URIs, many pointing to compromised CMS uploads. These links form a link farm designed to obscure the true destination, which is likely a malicious payload. The ClamAV detection and ML classifier strongly indicate malicious intent, consistent with phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://360clothing.in/home/www360cl/public_html/uploads/images/files/28470903614.pdf In PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/gibabazakewegasa.pdfIn PDF document text
    • http://metamorfoza-krosno.pl/userfiles/file/doreko.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fbf42045550---3680844997.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210630204247526.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/4e2181cbd3529288d909fd8baced6798/17579531539.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/4kvog5fu8od9ms03lq4mfb9b7p/73628433561.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/mf3q10erum4iocvp8ut9nq23fl/23130815791.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096f7df0c32e---jukagukazobi.pdfIn PDF document text
    • http://titibbs.xyz/js/ckfinder/userfiles/files/73057229433.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160f20ceb34e85---dosuvinoxu.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098776641b27---63438054632.pdfIn PDF document text
    • http://www.cenlafilm.com/siteuploads/editorimg/file/janolitivogirole.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e1007bff2---gixamopireliribu.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/kv2ikk7aur7mm2rk6jr06ms16f/busejolibi.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc4c681e2d---zodubex.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d2a0a6e5e8d---lunotidumonipobopirawi.pdfIn PDF document text
    • https://people11people.gr/uploads/File/15027626517.pdfIn PDF document text
    • https://budgetparking.ca/admin/uploads/file/98882088474.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/45109826998.pdfIn PDF document text
    • https://cncunse.com/d/files/19980234377.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/juhg67jft5s6eb47cg6tgjlu8s/42950988351.pdfIn PDF document text
    • https://www.hermanosvalerorecio.com//ckfinder/userfiles/files/fudekibolizo.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/b659f090247f79405f63b13d5e9eb3ae/zawog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=mitsubishi+electric+thermostat+manual+par-21maau-jPDF 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_off0000fb35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011347.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11347 19220 bytes
SHA-256: cc99b75871269a4ba10fd6c9fd6a9c706fe1e649db609f33afa2090fee6cd03b
font_02_sfnt_off000145a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145A3 11208 bytes
SHA-256: 8943aab6158c592344298d5fa099c7fa7cd477a6bbcdee97208ad66114c6a421