Malicious PDF — malware analysis report

Static analysis result for SHA-256 27e75b8ee9d8f371…

MALICIOUS

PDF

83.5 KB Created: 2021-07-22 13:46:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 6c4efc320fda59eb366f4f8cf997ec77 SHA-1: 5641646eb55617ec384b307bd0ce17ccfbef772e SHA-256: 27e75b8ee9d8f371e72e330de6ccf049c730ecc6681851236737490f135ecd5f
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable domains, likely intended to lure users into clicking malicious links. The document body was unreadable, but the heuristic firings strongly suggest a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a463ce8f566---13035006648.pdf In PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/15718576072.pdfIn PDF document text
    • http://lovellreunion.com/clients/4/42/420738e4954c29d3cfd02fdb1bc9139f/File/rizogajefubujo.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f3b99bc75e---36516455958.pdfIn PDF document text
    • http://goldenagegroup.vip/userfiles/file/36329098621.pdfIn PDF document text
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/1pa0g1kjruep7j73jsnp5421bh/8929907797.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/kg9pg19tr8ea0p7bs0lbmjd43q/vitisoxosisujimoxolago.pdfIn PDF document text
    • https://thefencedocumentary.com/adminfiles/file/kuxavofarudaza.pdfIn PDF document text
    • http://sparkpro.lv/content/file/26040993267.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/25882372848.pdfIn PDF document text
    • http://bruningfoundation.com/clients/9/99/99acc79c432c4c389b364f5b25189af3/File/87966265325.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/bakado.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16090f59fccb6f---43078734935.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b166c7528d1---vapuzapavifinigaxate.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160eff0aac15ba---zozexulerigalarodi.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160979eba0bea3---bedokazusegarubavo.pdfIn PDF document text
    • http://rolfingnaples.com/clients/a/a5/a5422f62036d2d393d866963e902351c/File/30682842668.pdfIn PDF document text
    • http://jandenzobv.com/image_uploads/file/42701445365.pdfIn PDF document text
    • http://annassteen.com/ckfinder/userfiles/files/92678906487.pdfIn PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/xipofojimizonoboguw.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/q55ie3dr8eii2svl52mqqhj0g7/rozavuvinepuribatidapama.pdfIn PDF document text
    • http://poorclarescork.ie/images/49852936443.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/wubutavadasefipajon.pdfIn PDF document text
    • https://scheidungsrecht-best.de/userfiles/file/62887613877.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=does+the+geometric+series+convergePDF 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_off0000e0a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A3 10536 bytes
SHA-256: a441c149466320d0dba87661aedde17ec96f4ee9037373a1e03c2c576d066548
font_01_sfnt_off0000f87c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF87C 17620 bytes
SHA-256: fba6d29aece88c8038937d562cec9b9bffea9c97ae698820e23257aada5fddb3
font_02_sfnt_off0001275f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1275F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1