Malicious PDF — malware analysis report

Static analysis result for SHA-256 b86bda3bd785b4e5…

MALICIOUS

PDF

71.8 KB Created: 2021-09-28 00:14:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 73097a62b6372bf859f765b40e8c2757 SHA-1: 1e751740817822ab6e38c5362f6b5f1cfc71485d SHA-256: b86bda3bd785b4e55ec4097e11806ac5074bc616e68545c1627b85f8856bd4b4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning model assigned a high probability of maliciousness. It contains embedded JavaScript and a large number of external links, many of which point to disposable hosting or compromised WordPress sites, suggesting an attempt to redirect users to malicious content or phishing pages. The presence of embedded JavaScript indicates potential for further malicious actions, such as downloading additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jokerprod.net/userfiles/file/66472231816.pdf In PDF document text
    • http://feriaalainversa.com/uploaded/files/12043625161.pdfIn PDF document text
    • https://hotelcorona.ro/files/70060764491.pdfIn PDF document text
    • http://fmi.lu/userfiles/files/sezonokudeti.pdfIn PDF document text
    • http://studiolegaletrotta.eu/userfiles/files/galafetukigiburujavi.pdfIn PDF document text
    • http://www.southpointinstitutehowrah.com/admin/uploads/file/zodububujososojefozaj.pdfIn PDF document text
    • http://youngshiny.com/userfiles/file/1632376523.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/pu2dlidmgse3ktsm1fekd6d0s3/42242380224.pdfIn PDF document text
    • https://siliconautomation.com/userfiles/file/46922050488.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614ef5e567c48---wimegisikimogu.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/daxanidebumedutezesaga.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/zifozetadezaligeberoru.pdfIn PDF document text
    • http://korvet-sp.ru/userfiles/file/62213220396.pdfIn PDF document text
    • http://www.ekoforte.com/upload/file/xawupogazefore.pdfIn PDF document text
    • http://rassadaspb.com/new/files/file/19826842281.pdfIn PDF document text
    • http://cafehinglung.com/uploads/files/90529901549.pdfIn PDF document text
    • http://www.hon-ro.hu/userfiles/files/vaxinefirimadumaviwoxi.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/sdjdvu9p45ta2c2jl2qocd64n0/witebeg.pdfIn PDF document text
    • http://vinabomi.com/uploads/userfiles/file/42786450062.pdfIn PDF document text
    • http://www.monts.sk/upload_images/file/15705370912.pdfIn PDF document text
    • https://i-chat.tw/js/ckfinder/userfiles/files/metewafurilomejelorodigal.pdfIn PDF document text
    • http://zxsolar.com/d/files/zugalibifuzeriwisora.pdfIn PDF document text
    • https://aksukartela.com/images_upload/files/sipavewazirureriz.pdfIn PDF document text
    • https://www.totspotdaynursery.co.uk/ckfinder/userfiles/files/baduzifasoguxepep.pdfIn PDF document text
    • http://xn--zb0by3yusal20ak5lcidnwigi.com/ckfinder/userfiles/files/1631387896.pdfIn PDF document text
    • http://ch-bovi.com/upload/files/rubitizedurujul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=enemy+at+the+gates+full+movie+2001+english+subPDF 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_off0000b5b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5B4 15960 bytes
SHA-256: 711389d2e77a4fb35d29cde135e130822513441072cfe6197087378a5a959a23
font_01_sfnt_off0000de9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE9E 11260 bytes
SHA-256: d2f8470a46fcf6a5ba1d3e45980537eb78bd1c2d90d82d8fe3ca8fb19bf6c144
font_02_sfnt_off0000f8f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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