Malicious PDF — malware analysis report

Static analysis result for SHA-256 236c9c32fe3d5109…

MALICIOUS

PDF

90.8 KB Created: 2021-07-07 16:24:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6ee8dc60c15ca582615536fbc0195b5a SHA-1: a85a8812532a76b3e9f26e14165edafb0b9a0f66 SHA-256: 236c9c32fe3d51091f2d3b18bc4fd600ae724cf07a81bf0e9a6170fc453cef47
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or link farm attack. It contains numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://coretry.ru/uplcv?utm_term=bibliographic+citation+for+a+book PDF link annotation
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/lo9fuki9f56tce58b5rkvb23t3/63628150357.pdfIn PDF document text
    • https://tectrongim.com/uploads/files/xasujolajasadutexoduwi.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/77098136968.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16079bb5d4173c---97088169475.pdfIn PDF document text
    • https://globalmediaminds.com/uploads/files/mofeguto.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/1286ff65001ac035cced23ba98363c01/sipurelobumifameva.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/rafutopavisiwezabam.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/ot1dvm5elm2i7qsre9277lcjd3/pegagitolufazudanerirer.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/c36ed37e039ae747ab2b8bafcc07b9bb/befodemavex.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609757ae59665---verekewuwagilamodes.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/rgknuvogh5u0lu19lietr92c7r/vezadij.pdfIn PDF document text
    • http://aitrans.org/UploadFile/file/F1202105092221108799.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/7f8a34b79f47d154b396e98e5f8387df/feramikagi.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/770b385466beec2813a6e99e3f49a96c/newaf.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609a9b799e076---69280439366.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/97654290502.pdfIn PDF document text
    • http://cafemsoffice.com/userfiles/files/gidewomizovowu.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8513b0835---98262297043.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/3bac1de941066863c130b3be6d49a1d1/gumuxosofeguta.pdfIn PDF document text
    • http://abpaluso.com/upload/file/wojixonosor.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/25635159088.pdfIn PDF document text
    • http://cncforginghammer.com/d/files/mokiwapefumolumu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5e6c82cb41---29281637274.pdfIn PDF document text
    • 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_off0000ff2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF2F 16972 bytes
SHA-256: 40bf0c61e93a1d0ef1bd41be3fa8f6d00e15f65ed9500116c580b87695e62c04
font_01_sfnt_off00012b8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B8F 10744 bytes
SHA-256: bf489eea6b42a79c8b3796720fc88786f94d267d5643ba01948d060e3941e13e
font_02_sfnt_off000143f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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