Malicious PDF — malware analysis report

Static analysis result for SHA-256 40b7af5752d64a8f…

MALICIOUS

PDF

82.6 KB Created: 2021-09-04 20:52:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: db28ae9633e5465a6a176d4a104fd725 SHA-1: f8a4e277d3cbe671fbaf1ee1ffabd21f9844b128 SHA-256: 40b7af5752d64a8fee0e6a9d3975bd8fc67b18fdc23b338ff1b7f4e62ca81369
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is a PDF identified as malicious by ClamAV and an ML classifier. It contains a link farm pointing to a compromised WordPress upload directory, suggesting an attempt to host or distribute malicious content. The presence of multiple unknown URLs further supports a malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • 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.
  • 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://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609e31d2401a6---10845926745.pdf In PDF document text
    • https://gruntbudowa.pl/files/file/48204635662.pdfIn PDF document text
    • http://fautographie.org/images/userfiles/files/40692402065.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/32499907308.pdfIn PDF document text
    • https://sjamsul-hidajat.id/ck_uploads/uploads/files/rogegebefisifila.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/pufebupesinim.pdfIn PDF document text
    • https://takipcisec.com/calisma2/files/uploads/18173126853.pdfIn PDF document text
    • https://electrodomesticaruano.com/images/ckfinder/files/pediki.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/4ff07472bb2b5bca381dded4356aee7f/fekikademelusikomupewuka.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee92ae0ae4---3572501353.pdfIn PDF document text
    • http://creatinglifeoptions.com/userfiles/files/vadabujekobimagubudi.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/sos58n3qsjatte5lj4tckpm41v/mipuw.pdfIn PDF document text
    • http://at2apigroup3.com/contents//files/84378397041.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/bf7eac1e46f9f4ae2fc0bae210f2d64d/6410385168.pdfIn PDF document text
    • http://fotografieindex.nl/images/uploads/27096299629.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/33226025914.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/zagipefoxofoligekebemi.pdfIn PDF document text
    • http://adbuilder.at/ckfinder/userfiles/files/muwoluteno.pdfIn PDF document text
    • http://grandviewgroupresort.com/upload/files/67952448142.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/taxagumesugaguji.pdfIn PDF document text
    • http://malovanesklomh.cz/images/file/wajegidavuxes.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/tikujorewusujifuzoxo.pdfIn PDF document text
    • http://emeat.ru/var/files/pabexepujonumedajepazun.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161296de161205---gamilogupapibibewam.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a704da5ba3b---xawolabapenosubiburoki.pdfIn PDF document text
    • https://cosmopolitanhotel.eu/uploads/wysiwyg/files/508790464.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=arsenico+propiedades+fisicas+y+quimicas+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_off0000db29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB29 18604 bytes
SHA-256: f2b9f0d1a67aa3d7e92de1b6a0352ed52c3895960350bcbb92f9f7ab8ecf8e65
font_01_sfnt_off00010abd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ABD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000122d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122D4 10980 bytes
SHA-256: f115cabf37f8078f9b570273c59cb3ed718bbe01523f017f14d5e444e90626c1

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