Malicious PDF — malware analysis report

Static analysis result for SHA-256 845f4ab832b8f67b…

MALICIOUS

PDF

93.0 KB Created: 2021-09-06 09:49:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 48b23c0663c457c2d27b27715e9c60f0 SHA-1: 7df4338ba11aac9a211defa9ae29881272c00af8 SHA-256: 845f4ab832b8f67bbbd395a227fe452b03a2fef6c95603a5828506dd1076240d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is often used to download and execute additional malicious payloads. The document also features numerous links to external sites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://davidhammerstein.org/userfiles/file/227185134.pdf In PDF document text
    • https://dprkoreatour.com/uploads/files/tixegofusobijisatazok.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b0d84168bbf---48981976536.pdfIn PDF document text
    • http://technocom.pl/editor/file/84856901291.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086fc848534c---xibaxogijizajetinupado.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160d85731da71e---zevazuparini.pdfIn PDF document text
    • http://bkmarine.net/ckfinder/userfiles/files/1626390769.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8047c2f86---35744417461.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/xizufavuxade.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/cc5e76ebff591fce913b1ee9442c5b80/64971719180.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/bonaka.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609e7c9aa471f---fivekefi.pdfIn PDF document text
    • http://prtourusa.com/FileData/ckfinder/files/20210906_3FB54A12FC6C0F8C.pdfIn PDF document text
    • https://mobiligennari.com/userfiles/file/wuretibegopew.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/uramsgiofp1mfgrvllmvi7ft91/59685770122.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/bo45o2dbr240jajib4mnocih43/bewujuf.pdfIn PDF document text
    • http://ilyxrace.com/userfiles/files/xugaleguwatolinatep.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/kotipesomalamepuz.pdfIn PDF document text
    • https://tannhatviet.vn/upload/files/33379326693.pdfIn PDF document text
    • http://www.77ice.com/upload/files/77474311307.pdfIn PDF document text
    • http://tsutae-f.com/js/upload/files/nadavubitagip.pdfIn PDF document text
    • https://mp2020.csysadmin.com/ckfinder/userfiles/files/nesimobinavu.pdfIn PDF document text
    • https://www.tamilsaga.com/ckfinder/userfiles/files/genuv.pdfIn PDF document text
    • https://jokerprod.net/userfiles/file/desasitopatu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=new+school+physics+text+book+pdf+downloadPDF 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_off0000faa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA1 21864 bytes
SHA-256: 27565e1e38c051b798e34f532352109ce44f43b9ae8bf5956ec45e105bf5b003
font_01_sfnt_off000133e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133E5 11128 bytes
SHA-256: 5363e349eee4cee415263b8f5caf9c3af15075a534ce9d44df14b83ae0170627
font_02_sfnt_off00014dba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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