Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a326b63f9746772…

MALICIOUS

PDF

85.8 KB Created: 2021-09-05 23:09:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 429404a5f36f10fac63459feb73029a8 SHA-1: 35c751a18a4f5214ddc2c3cd8d80d9c1fd8b1989 SHA-256: 4a326b63f9746772080cc040f69f963bbaadec42d3a1ad34e1e572d1f60df290
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious content. ClamAV detected this as Pdf.Phishing.Trojan, and ML classification strongly supports maliciousness. The primary attack pattern involves luring users through a document that hosts a collection of potentially malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/kuvqf04mhoc2a7eaplnmpj9rsm/revimosanize.pdf In PDF document text
    • https://sieuviet.net/webroot/img/files/zapuwuxasoj.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/adf1214b141a125685aef260be0110d1/80587581200.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/edb047ddd14f015a4dac6f98dc31eacd/fojinazojafuxudutoga.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/56325788773.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/terelibisonilemomu.pdfIn PDF document text
    • http://chikatere.com/Upload/files/bimilinomuxidej.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d574ff31bd---57121987153.pdfIn PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/dd789c83dc2796f37ba0115fb750386b/75623493854.pdfIn PDF document text
    • http://vhshf.de/File/59053380485.pdfIn PDF document text
    • http://agriturismoilnoceto.com/userfiles/files/85315611414.pdfIn PDF document text
    • http://aligokdemir.com/resimler/files/zurufuwixigodamubi.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/033c9291c83159c4993368cde3618365/gobuvav.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/bepexaduwexilobafas.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/4dc7a8fc841f3017c4cef8007f2a04c8/dadajiwozegafapadezugoja.pdfIn PDF document text
    • http://111-orte.com/testarea/cwsCMSlight/media/files/26190455252.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/483150aa7fb35eaa74d0c65c8de2c60e/mijazobaduxu.pdfIn PDF document text
    • https://natatourism.com/userfiles/files/welilebowiwigisiweduxogik.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16115067319880---9840733714.pdfIn PDF document text
    • http://tecnibat.net/uploads/archivos/mapedolafuxonupuz.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/tjpgcoechnsam1717ohkr5ilfe/burusemapijas.pdfIn PDF document text
    • https://moveo-sport.pl/userfiles/file/79921346237.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb72510c88---foravej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=probiotics+pdf+2018PDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000103c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C1 10812 bytes
SHA-256: 125bcf517a5ba965101282ed15949eecac5e240abb5d3e57bf218fdf201b3185
font_02_sfnt_off00011ca2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA2 17636 bytes
SHA-256: 20b92f059b49e2a1be29ad65b65ae76d6883608639b4afda5c84e2a0675dbf70

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