Malicious PDF — malware analysis report

Static analysis result for SHA-256 919a28826f6cb7f9…

MALICIOUS

PDF

83.5 KB Created: 2021-09-23 17:15:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8de8cfb4f9508883e943865dabb74b8f SHA-1: ef067e87713c04c22110ec3780f873db2140d1fe SHA-256: 919a28826f6cb7f9561203575299353c6a8582560fc4150309a3304336a3d59a
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to redirect users to malicious sites. While no scripts were explicitly extracted, the nature of the link farm and the PDF's structure indicate it's likely designed to exploit vulnerabilities or deliver a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://barrier.exma.cl/ckfinder/userfiles/files/sevowugizukonatexoba.pdf In PDF document text
    • http://jshtextile.com/UserFiles/file///83963201861.pdfIn PDF document text
    • http://www.catedralirodahaz.hu/data/editorfile/72192680115.pdfIn PDF document text
    • http://theloanwala.com/userfiles/file/93879997699.pdfIn PDF document text
    • https://divetechmarine.com/contents/files/13989304369.pdfIn PDF document text
    • http://alburigiott.it/userfiles/files/84533437807.pdfIn PDF document text
    • http://nsmpublicschool.org/slbdavbatala/userfiles/file/73467703549.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613581f616055---25719806092.pdfIn PDF document text
    • http://thecargonepal.com/userfiles/file/komodeme.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/4317488307.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/60d7e43e66deccca820d2f9315ff9be9/4285636663.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/wonipuleviferad.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/71511310882.pdfIn PDF document text
    • https://nstoplana.rs/ckfinder/userfiles/files/71987131177.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/sufuteduzewoleselesudib.pdfIn PDF document text
    • http://tamtamphat.com/upload/files/41883723352.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613223d3295f8---sidakevilokiwubawipa.pdfIn PDF document text
    • https://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/55106715783.pdfIn PDF document text
    • https://praktijk.zorglink.nl/ckfinder/userfiles/files/fezapebufotepezu.pdfIn PDF document text
    • https://fpcofmacon.com/nbloom/fckuploads/file/53609785868.pdfIn PDF document text
    • https://vidaleve.ind.br/ckfinder/userfiles/files/66412104059.pdfIn PDF document text
    • http://ahchala.com/img/file/18295896260.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614bbbc646b5f---wulukuwuxemapiligene.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc039b43c9---getisetero.pdfIn PDF document text
    • https://hoangmailogistics.com/asset/site/files/kogatodiwamivitutebovevox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=android+futbol+oyunlar%C4%B1PDF 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_off0000e22c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE22C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA43 10428 bytes
SHA-256: ee715a830a3774c2b75c6fd42a860429c8dabe582dc9d3e197de6adbf0bc90a6
font_02_sfnt_off000111ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111ED 18448 bytes
SHA-256: e71d0e271411535e6c45b3270aa0797e3fbd640049a456c75a8e9cfc05465d85

Open this report in the interactive analyzer, or submit your own file for analysis.