Malicious PDF — malware analysis report

Static analysis result for SHA-256 380171ce25291952…

MALICIOUS

PDF

98.4 KB Created: 2021-08-11 16:37:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 15395a1d726900fc4fec7f1990ec2c60 SHA-1: 7722920cfe19de530881d7e41afcca60afb082e8 SHA-256: 380171ce25291952d75e29ac60e5181dfaccac288b0af1a7410d33c7d8c7def2
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving exploitation of PDF vulnerabilities to redirect users to these compromised hosts. No scripts were extracted, limiting the analysis of direct payload execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c5ea0b4280---59359296582.pdf In PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/3b2d74453cc61a8ae10fc21c78283a0b/fibakipa.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/oqg8bq4504ndhhfv4sgpjs29t5/pasepul.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/12335945774.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/b83d55ae4d589e848b60aa9d7cda7ddf/madisuwamo.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/ba9dedf3f2bdc21c27b83a2a47b0aa0f/82597998425.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/9b76c695490bcb09b2e504b9f3ef9220/lapozowetemikaliporoz.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/b34f5072916b2e205b02acc5f264129c/poluzibejanojipiga.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/b7f0645aa2f8f4133aa8223dc9906cc7/26929964217.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/kododib.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/zufine.pdfIn PDF document text
    • https://wonkingchina.com/d/files/pumobotejawevazujaxofevak.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/2d4a4ef5531592a39775fd470a474b68/34995976347.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/591a8494ba10a292b2ca093cdb4112bf/77853392334.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/99a9d5672195c7f0c4efe3c2b3d6961d/kukelevux.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16089d564da5a7---palopikib.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/2784dd0f6e73fde050bc837cd00a8cf1/joxima.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/161029496cba6d---wuborizaburigabunaka.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3e6c89b167---goxulil.pdfIn PDF document text
    • http://www.tiendadelbordado.com/ckfinder/userfiles/files/35226671028.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/64f2cebe0136d87a298c942d7e19ee6b/15443078111.pdfIn PDF document text
    • http://quiltingacademy.com/fckeditor/userfiles/file/1316091502.pdfIn PDF document text
    • http://galeriejacqueselbaz.com/userfiles/file/53174308477.pdfIn PDF document text
    • https://vayamcs.com/content_files/files/vozonodurex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=ubi+caritas+sheet+music+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_off00011e0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E0C 17456 bytes
SHA-256: c8eb48a096d86acf47bc91c5637219221612d8aefc0d81cffc673c675b4c1d71
font_01_sfnt_off00014b3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B3E 10860 bytes
SHA-256: 3443c453dea08856138b26d0bdd2d08a9983dc7d6b235cebd0340e784fc5b3c4
font_02_sfnt_off0001642e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1642E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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