Malicious PDF — malware analysis report

Static analysis result for SHA-256 efb3a8efa4fd465b…

MALICIOUS

PDF

82.4 KB Created: 2021-09-04 11:43:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3e083b03645aece9b274aeda7e6c051e SHA-1: dc2b938df0d70ed9091f1140721dee8435a93ef3 SHA-256: efb3a8efa4fd465b13d44d4769edc72f61aa1da382ff99a0d4fa33a170343411
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links pointing to compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the presence of numerous external URIs and the PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristic indicate the file's purpose is to redirect users to potentially harmful content hosted on compromised domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/72af6453d5941aa9fe4268f1b5d7f83e/xidojusev.pdf In PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090e6c9c80b7---25653380143.pdfIn PDF document text
    • http://howsonfamilyreunion.com/clients/5/57/57b8fe7d350e782a16e6afc8bdcd6467/File/64985064407.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/bqujfvj0fodd7n89pj8lgs2i89/rezasibadavobuzixubasuma.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/sakegaxilijilir.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/11024882543.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160750afbb3143---roduvevejaxob.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/d749c11fea7ad0883a670a16758fad24/rutedafesagexevepajosoxak.pdfIn PDF document text
    • http://sage-chem.com/image/files/20210709_015728.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160e09f92e5317---96352728861.pdfIn PDF document text
    • https://warungmimpishio2.com/contents//files/94210638852.pdfIn PDF document text
    • http://jyotiacademicpress.org/uploads/file/84685158673.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160d192ad43f04---15346923535.pdfIn PDF document text
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16082227a90116---89915966581.pdfIn PDF document text
    • https://patriciobanados.cl/upload/file/In PDF document text
    • https://synodradomski.pl/userfiles/file/16366202502.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ade713064fb---43270779341.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe3a29a486---99696269146.pdfIn PDF document text
    • http://oticonshop.com/ckfinder/userfiles/files/35132269114.pdfIn PDF document text
    • https://detector-billetes.com/Imagenes/file/nebejofevasijinowopop.pdfIn PDF document text
    • http://uhy-th.com/image/upload/files/mobameda.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/0145a554e7ada76a9f3965c7a828fc09/nurobijalo.pdfIn PDF document text
    • http://galgalesh.com/userfiles/file/3791179615.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/f7258bbc9fe0cb24054326c88b023b07/77603450450.pdfIn PDF document text
    • http://uzks.hr/upload/datoteke/razesupezirugovisuwolafa.pdfIn PDF document text
    • https://cuacuonbentre.com/upload/files/42205458265.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=bunch+of+thoughts+book+pdfPDF 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_off0000df42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF42 10752 bytes
SHA-256: af2db2ea89483ac8f18e941fe46be604422803c5a6df1c00cfce7a6314b845cd
font_01_sfnt_off0000f78e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF78E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010fa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA0 17132 bytes
SHA-256: 434ae89e70aae6ecaa81b7d9330c0bf31034e8dc191ac59a5eb4822ec8e7f715

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