Malicious PDF — malware analysis report

Static analysis result for SHA-256 de632b5b38e23045…

MALICIOUS

PDF

82.3 KB Created: 2021-09-06 17:03:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1a68d9a2956c0be3a8ba2a8a46142d07 SHA-1: 71ea00352f0217bca44c6b7431256e942cd1e592 SHA-256: de632b5b38e2304515d7d976ddfb130a56a627851c1a82335d8c75e299d069d6
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites and disposable hosting domains. The primary goal appears to be directing users to these external resources, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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 https://fallsplat.se/file/36758595932.pdf In PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/uin0dki4dealm6r0iuusattm8n/fanijutubovate.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160740082bf0d1---mixadevofebufa.pdfIn PDF document text
    • http://hyundainhapkhau.net/upload/files/27990170608.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/vozovufuxibugak.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/cd38c8052fe720c8c1170a8b0eb4ea6b/furafogigidarokef.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/zigaruvum.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a61b8c56f42---339249838.pdfIn PDF document text
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/160724f88b2915---85760833152.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/famidejemarufe.pdfIn PDF document text
    • http://investgeorgia.ge/userfiles/file/12280042156.pdfIn PDF document text
    • http://cartopack.com/Images/file/nudunimebanuvopiful.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/l32cadtk7054celhpk5jhljaru/sefow.pdfIn PDF document text
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/kagijakufidezivamajuzuw.pdfIn PDF document text
    • http://thepokewave.com/uploads/files/11075483759.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/19988463572de02a9bcbac2e8590e607/4113739011.pdfIn PDF document text
    • http://manavpublicschool.org/manav/userfiles/file/mowumol.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfb8727c80---firigiviporurevoz.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/o8cbepehs99019sf0ovpe5sv6m/73046834493.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f7c4f5ab6b---lubanumerivujekulesi.pdfIn PDF document text
    • http://www.dogwoodagility.nl/ckfinder/userfiles/files/sotuvifotelesuxuka.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077adab72855---39876569724.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/e27e84989323a729ce4110a48253f8e7/jibelotob.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/34c863b1f7699cdad32f07bc954f49fa/zeguxuwazux.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/80125706334.pdfIn PDF document text
    • https://gencshow.com/upload/ckfinder/files/80382264678.pdfIn PDF document text
    • https://bursac.net/userfiles/file/55595084224.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=define+manual+handling+definitionPDF 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_off0000dcbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCBF 10636 bytes
SHA-256: 26e71f9b260b3940288ead62e341ebea0063ac5d1e4e751304ed3603d115d2e4
font_01_sfnt_off0000f496.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF496 18184 bytes
SHA-256: f491b6441c186f68227cdb2d1b54aee5f710bd0dc4aaef3aeee71428768dedf4
font_02_sfnt_off0001236f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1236F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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