Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1e51c41b305b2d1…

MALICIOUS

PDF

108.9 KB Created: 2021-07-06 21:01:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: b442a2006156068ee5f30c4637a18d2e SHA-1: 3d85e7e8587b7fb76c14584adf32561ad26a6129 SHA-256: b1e51c41b305b2d17fbe74fc7802c4d9f1f9f836c5f62150189d31e6fdf8b47b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9868

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://infrive.ru/uplcv?utm_term=it%27s+been+a+long+time+fast+and+furious+lyrics PDF link annotation
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/81bf96e20d7f7f270fa12dacf29292a2/bozazo.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad596ca3213---xofazoruzunizitafakilewaz.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/950afaa02d45387a960063138d3a10e0/worigumi.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090776e785a1---jafaxofadoxi.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/45878fe30200ce2d9fc9a4cae4d20305/48895492335.pdfIn PDF document text
    • http://haohanlegend.com/Uploadfiles/files/33670932147.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/a9e116b5b6bca90300b95cfd1d6bedfd/tosesosuredoteroporunu.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/denoleb.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd6b194640---tujid.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/51c440e834424e1a74a7f62aaa3f2fe2/587792801.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/2fcccaa91d717551fdbbec0d67207514/xiwusanajevanakagex.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/tifowofut.pdfIn PDF document text
    • https://dondepodemosir.com/userfiles/file/sijijojakagigewami.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/tazukesasivo.pdfIn PDF document text
    • http://agroanaliz.by/upload/editor/files/kafib.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/0bed85e34bf9a2b0865780f4e7eb6c02/bodutotudegozetazisufugi.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210512011203244.pdfIn PDF document text
    • https://ready4use.ru/uploads/files/41058145966.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/97d53c789ebdbb5ba559e49ba0b78a93/sajilugojiziseke.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c36cc0901bc---kaxazifakujeki.pdfIn PDF document text
    • http://rajeshjshahani.com/clients/d/de/defaee86e9f1fedea086b53a5072ac2c/File/figedo.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c979d2c4aa0---dexaxibuwedekivasenexaj.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ddddc24a20---3321317455.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd1f260bae---99808107338.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/boziranurijud.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013881.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13881 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015093.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15093 19608 bytes
SHA-256: 18269a7c6a11f4cb321b69405d53e0b314b4b915443c41d572c59ca6011b78e5
font_02_sfnt_off00018272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18272 11156 bytes
SHA-256: ca87deea7235d87cfad95c918f3ac35afb3f40bdec11cbbd84ece40f989ddc18
font_03_sfnt_off00019c64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19C64 1856 bytes
SHA-256: 184a936bd1ce5dff700adc4e6a12c67a52a21ba3f6bd4f31defed58e18ed8b92

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