Malicious PDF — malware analysis report

Static analysis result for SHA-256 094163932d21a69a…

MALICIOUS

PDF

80.8 KB Created: 2021-09-17 00:16:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 42b0f51af72fa7739eac2039151f7fdf SHA-1: b651bf4af1f6dc29b65b431fcce2a7ff7e42e5af SHA-256: 094163932d21a69a64abaa30682e2e48da21f1016aa7843f509ef1c0f6b9464a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious. Heuristics indicate it contains a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting a phishing or malware distribution attempt. The document body is truncated and unreadable, but the presence of numerous external links strongly supports the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16136f676110d0---jigiwavofapi.pdf In PDF document text
    • https://lanegarrett.net/userfiles/file/vopobipenedatikanem.pdfIn PDF document text
    • http://templeton.sk/userfiles/file/wepupudekomuxevomudasuxe.pdfIn PDF document text
    • http://e-kva.ru/admin/ckfinder/userfiles/files/gusatawisuwuk.pdfIn PDF document text
    • https://simpangkanan.com/contents/files/44781217440.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143b0e94ebbb---kabow.pdfIn PDF document text
    • http://xn--90aoa5aj.xn--p1ai/ckfinder/userfiles/files/46677189605.pdfIn PDF document text
    • http://yogo110.com/userfiles/file/dapofafegalo.pdfIn PDF document text
    • https://grootformaatspandoeken.nl/userfiles/file/metibegiseve.pdfIn PDF document text
    • http://brenderup.ro/mm/file/97502276511.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/0fhcq2vavi634jq1st9dc4f6li/patidofelolavomizutakoguk.pdfIn PDF document text
    • https://fullprotec.com/ckfinder/userfiles/files/dejujuneveduzabem.pdfIn PDF document text
    • https://oncetrabzon.com/resimler/files/20931915297.pdfIn PDF document text
    • https://cyklo-wellness-penzion-palice.cz/content/rimagowa.pdfIn PDF document text
    • http://kup-vino.cz/web/ckfinder/userfiles/files/78728577322.pdfIn PDF document text
    • http://cichanski.com/Upload/file/31655033267.pdfIn PDF document text
    • http://hairfibers24.com/upload/file/tagabilaboxo.pdfIn PDF document text
    • http://columb-sklep.pl/userfiles/file/lagofome.pdfIn PDF document text
    • https://beysukonaklari.com/ckfinder/userfiles/files/42254960405.pdfIn PDF document text
    • http://linkingpeople.info/userfiles/file/76928997194.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/16141ac86edd0a---62454493186.pdfIn PDF document text
    • https://castilloexterior.net/ckfinder/userfiles/files/67423873133.pdfIn PDF document text
    • https://luiginoiobbi.com/userfiles/file/fomupuvukudarez.pdfIn PDF document text
    • http://majorpropertygroup.com/userfiles/files/sovujofamage.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=simple+present+tense+worksheetPDF 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_off0000d9eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9EB 16960 bytes
SHA-256: 841a8aa12a8b92e78878771cd66d2c51095732bc5f682850c82f549d2318bc9d
font_01_sfnt_off000105b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B8 10608 bytes
SHA-256: 422dc01be7be3dc4f10cdc7ea615bc90fd1352614b92f05ed4837145b12d3ac5
font_02_sfnt_off00011dc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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