Malicious PDF — malware analysis report

Static analysis result for SHA-256 f47a17c957feb4a4…

MALICIOUS

PDF

72.9 KB Created: 2021-09-28 23:56:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 9aa9c17d02c1b91c7f86ce0bb00b9d18 SHA-1: aa4c900946f64fffff17f5fb75204c686513216b SHA-256: f47a17c957feb4a419e24635c4354d40c6fb4617494d8a04875055885efe445e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by multiple heuristics, including a high-confidence ML classifier and ClamAV detection. It contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The presence of embedded JavaScript indicates an attempt to execute code, likely to redirect the user or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142d01973d7d---retaxogemudagozajaja.pdf In PDF document text
    • http://technoauto.jp/js/upload/files/kixawa.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/fapajujazobaxunuvol.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1615051c483c86---15047402903.pdfIn PDF document text
    • http://wu-pao.com/upfiles/editor/files/kisuxitabuwovunisukire.pdfIn PDF document text
    • http://mojaksiegowa.net/userfiles/file/27317795991.pdfIn PDF document text
    • http://rogersdesignhouse.com/uploads/files/80388708958.pdfIn PDF document text
    • https://kolegium.inaheart.org/upload/files/lumenogisifesivelofiligev.pdfIn PDF document text
    • https://lolakarimova.uz/ckfinder/userfiles/files/negetogumotivavubebup.pdfIn PDF document text
    • https://australiancaravancentre.com.au/application/third_party/ckfinder/userfiles/files/39486188846.pdfIn PDF document text
    • http://taiwangallant.com/uploads/files/202109191632591452.pdfIn PDF document text
    • https://osiindia.org/ckfinder/userfiles/files/lezafaxavuzo.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/83360631118.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/161300d474529a---zijibuxetelega.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613feae1762ec---xugedefuwaxi.pdfIn PDF document text
    • https://discovercefalu.it/_data/images/file/44688507274.pdfIn PDF document text
    • http://p-energo.ru/content/file/19034253759.pdfIn PDF document text
    • https://learnrkb.jugalbandiresearch.com/ckfinder/userfiles/files/pexigavinulegakuxo.pdfIn PDF document text
    • http://hvezda-pardubice.cz/files/file/23229404119.pdfIn PDF document text
    • http://klimatyzacjaradom.pl/userfiles/file/sumedagidozifo.pdfIn PDF document text
    • https://www.sensiblemachines.com/ckfinder/core/connector/php/files/bubaxinitewoxenigogifa.pdfIn PDF document text
    • https://virker-ikke.dk/files/kalekovejixonaluraso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=old+booth+for+androidPDF 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_off0000b73d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB73D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF4F 18772 bytes
SHA-256: 57ccc197d4e38f71365eccf3fac017cea9fcd025ccb6c613320c558fbc4e9e17
font_02_sfnt_off0000fefe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEFE 10316 bytes
SHA-256: ec085761e72a89b5df4840f4b39f35012d5aac3f811cb6e4f2125ab27d365093

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