Malicious PDF — malware analysis report

Static analysis result for SHA-256 3015451d18279164…

MALICIOUS

PDF

79.6 KB Created: 2021-09-06 04:34:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0e96baa69b5dc184ad45e1d86d8ff0ab SHA-1: 1fcf2f83c92a9b7fceb6f482553c955c2a90a85d SHA-256: 3015451d18279164cdf606e99d1aba21a8f6bba3c1141b5342be39ddd012aac9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to various domains, many of which are hosted on compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to lead users to external, potentially malicious, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.sindafaz.com.br/admin/editor/ckfinder/userfiles/files/58104878641.pdf In PDF document text
    • https://annjulieskarpmo.com/userfiles/file/95818004369.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/tirusapodunerunelas.pdfIn PDF document text
    • http://www.knickmeier.net/images/pageimg/file/xogamiwiruxewezu.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/62474518676.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16094df062075e---31115279042.pdfIn PDF document text
    • http://2446665a.ru/ckfinder/userfiles/files/gonos.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/20ea01532036bc624fcdcc7ca324c7f4/rowuximinu.pdfIn PDF document text
    • http://vinaktv.com/storage/ckfinder/files/88988927778.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160bd122b26e84---jafemolawizo.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/gc1gufuk6h5e19dof9h2a69o52/padokuf.pdfIn PDF document text
    • https://sabagdasarov.ru/upload/file/69012949381.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/remodobaxibuvezarasap.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160997fb5e898a---55193851940.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-5-3/20210503014650412320.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/begoroze.pdfIn PDF document text
    • http://cnwt.mgo.cool/upfile/files/2021/08/18/rakapuwanapixevinexuz.pdfIn PDF document text
    • http://poney-club-romilly-aigre28.fr/userfiles/file/44429390402.pdfIn PDF document text
    • https://maturana.cl/upload/file/zurusakojosokup.pdfIn PDF document text
    • https://artedeeducar.com.br/ckfinder/userfiles/files/73461043908.pdfIn PDF document text
    • http://premo.at/userfiles/file/68444423589.pdfIn PDF document text
    • http://acupunctuuryao.nl/ckfinder/userfiles/files/43504422746.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/a58b8d23f9895a9b63c5fabbd7f5faaf/48040907918.pdfIn PDF document text
    • https://observatoire-omic.org/documents/file/4302301583.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=o+que+%C3%A9+aprovisionamento+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_off0000cfb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e7c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C9 11104 bytes
SHA-256: 66354b2b02db2082ed06b5c8a9645573718dbbb940b1491291b448d634a1ee1f
font_02_sfnt_off00010134.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10134 18396 bytes
SHA-256: 88f524787bba01f922e4ee78ee6c65bd84dcd6fbee76d5b2b5052a85c704dd58

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