Malicious PDF — malware analysis report

Static analysis result for SHA-256 77ebfbdfb12450b6…

MALICIOUS

PDF

91.3 KB Created: 2021-07-01 16:33:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: c84c19c571708477b0d04ea23ae15624 SHA-1: 829d500dd33d65c62f54e557fd4b2481efdb0b03 SHA-256: 77ebfbdfb12450b690e284814159c1e5f979fcf50eaaff37beb55ed51019e268
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites, suggesting it's part of a phishing or malware distribution campaign. The presence of embedded URLs and the nature of the heuristics strongly suggest the PDF is designed to redirect users to malicious content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/ab513a574a8d5ad2db3234b07b257eb6/vigegudupewipa.pdf In PDF document text
    • http://smakbyala.com/ckfinder/userfiles/files/33002122077.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d4f476c6962---31366122289.pdfIn PDF document text
    • http://distributoram.com/files/file/bokomiximarar.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160ad93f81535a---17275289898.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/f56de70fe9d046389938d52d3a240e63/43276777540.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/umrmru53fkng242irbeat0oht0/kuporesarodixal.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb2179459a7---doluzapusufosetipimale.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210606111500.pdfIn PDF document text
    • http://china-zub.ru/userfiles/file/xakosegewipa.pdfIn PDF document text
    • https://noithatkuongthinh.com/uploads/files/pelukusidi.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609c295832fbc---sidoxomokomuwaza.pdfIn PDF document text
    • http://thesetnews.com/images/fckeditor/file/pidiwidip.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/74dno1hries6lo5do5mvnv6n5v/61847055002.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/9cc800ee74ca7d542c976f6ee75cd023/rotekobejowavuluk.pdfIn PDF document text
    • http://ydtmuhendislik.com/ckfinder/userfiles/files/vufibepasibuxoguderejori.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607776c46c0de---jomofevobewexevarasilu.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/38566857798.pdfIn PDF document text
    • https://oxi-dental.ro/imagini_ws/velifogepe.pdfIn PDF document text
    • http://halaljones.com/uploads/files/76065364300.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073c6b229fb7---loginoresuradavenusif.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/aummi803ksrakbudkqk2li70je/68675089631.pdfIn PDF document text
    • http://gopherandsquirrelcontrol.com/admin/images/file/35102312921.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=pros+and+cons+of+a+presidential+systemPDF 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
    • https://bit.ly/36PbdtzIn 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_off000102e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E5 16180 bytes
SHA-256: 29ff35145472aa875491dee2d110b2c0b434fb0407d02307147c25456c382719
font_01_sfnt_off00012cd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000144ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144EE 10896 bytes
SHA-256: e67f5f6479cec02dd3fd3cf1ebc0eb8c69b3f2583d14c74baa6a206d01baa511

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