Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7da5478e262f4c0…

MALICIOUS

PDF

88.2 KB Created: 2021-09-03 22:31:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4b16adf529faf5d4390ba94b5ed7bbe1 SHA-1: b810ea95ac8cb6b55281ac2d12004247a1e4da79 SHA-256: f7da5478e262f4c0a335eeb40d9615aea02f22cdca066c65184ec6129e7900aa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress upload storage and other disposable hosting, suggesting a link farm designed to distribute malware or facilitate phishing. The presence of embedded URLs and the nature of the heuristics strongly suggest this document is part of a phishing campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160accd346434a---36786715863.pdf In PDF document text
    • https://sacc-la-chaux-de-fonds.ch/fichiers/file/40673258120.pdfIn PDF document text
    • http://unionnutritech.com/upload/files/41534355272.pdfIn PDF document text
    • http://ceresasrl.it/userfiles/files/keboxodivejazekokizexezig.pdfIn PDF document text
    • http://pensjonatagat.pl/userfiles/file/duweseniwi.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/e05f9317146ed91de3c197d501b933ac/17693133849.pdfIn PDF document text
    • https://isleo.com/i_photos/file/87030145458.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/a4a5582a764f9c8d900e9f5dee5c0f1c/dugison.pdfIn PDF document text
    • http://dakmoto.cz/obrazky/file/poxaxopotimo.pdfIn PDF document text
    • http://smartarts.bg/userfiles/file/xirikikad.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074a69679cce---xototekadopaziralizesonod.pdfIn PDF document text
    • http://vanprodukt.cz/UserFiles/File/78121642499.pdfIn PDF document text
    • http://vipforiraq.com/userfiles/files/matorutixoduxizivogu.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/17e4ae1193fff6cfa97e8a43d0b34236/bekevorokepiboriwikovo.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/m8veko3099hhp4j28abh6jalmd/wosixazezopeposebiw.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/98305a8977b9773961a49f6fda8c8d86/nutopakeligonoxa.pdfIn PDF document text
    • https://www.stavbyhes.cz/ckfinder/userfiles/files/2971722758.pdfIn PDF document text
    • https://lesura.net/userfiles/file/tegefalilugivib.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161177bad61c94---sexuvozozinovab.pdfIn PDF document text
    • http://zubrcup.by/files/files/12396378045.pdfIn PDF document text
    • https://mimpidia.com/contents//files/zekosefukopuvizexuf.pdfIn PDF document text
    • http://uptownfallschurch.com/uploads/files/jemunepovugabofiwowomi.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ba93fa90fca---56036548421.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/0cad60fd977d15918cab64f450fe5784/jexevomazetelizadugi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=bernardo+barranco+libros+pdfPDF 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_off0000edc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC0 10708 bytes
SHA-256: 57306667338ec95553dd817e5e253010941993ac22dc0fd1851e52bf2442a73d
font_01_sfnt_off00010628.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10628 20588 bytes
SHA-256: 42bf74f46544371879db1863ce1f5e14dbbb9b37b28d4fcc8c3ec8ea58358996
font_02_sfnt_off00013ae8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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