Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cff4b517c01f5fb…

MALICIOUS

PDF

101.0 KB Created: 2021-07-24 00:30:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 85357911fcd16518a3def425a54d8366 SHA-1: 8e5278e7e805b2b482291c0d990520fdf22243d6 SHA-256: 8cff4b517c01f5fb50a824299c7a3af5b90207f83c712e49d0bfb1997d820779
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to numerous URLs hosted on potentially compromised websites, suggesting an attempt to redirect users to malicious content. The presence of multiple distinct hosts and a high number of links indicates a strategy to distribute or host malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://stallingreunion.com/clients/a/a3/a37dbb3dca22f8cb40f44de83fe48269/File/fugitu.pdf In PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/dqgl1o68envcmgcl3lm8uu4621/20019259194.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1609484fc7534e---witako.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609d49708ab56---67222808073.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160af86212d101---68699517076.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/16086df9cba600---34716887041.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c788e93ab94---57417867656.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/sufapexite.pdfIn PDF document text
    • https://soechi.com/userfiles/file/papilaguwu.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0efc23024---11782662708.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160f58f69be8ae---lugula.pdfIn PDF document text
    • http://kingtonkatsu.com/uploads/files/20492215909.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/186d83565bff23c056c3276946817b00/pebopizoziju.pdfIn PDF document text
    • https://www.deuba.info/wp-content/plugins/super-forms/uploads/php/files/7bmuvoitd32n3o5lmip2ir4d5j/motowofune.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/2e28d96a9859660aa217b7781370932a/60580129530.pdfIn PDF document text
    • https://stopserv.ru/files/file/94995910491.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/bg87lm766552ff6h9rs54vh4n2/38120366947.pdfIn PDF document text
    • http://kotolantopeni.cz/file/128955023.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/mixugidavizunuxonapulowo.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/5a5895ed2d4d7d3557711e39936fc6b8/latexexogemeko.pdfIn PDF document text
    • http://aokisuper.com/ckfinder/userfiles/files/79526696934.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074600de5ba4---95207340278.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/77bd06fd908fb746fda8d30901701c31/16292751617.pdfIn PDF document text
    • http://gallery4walls.com/upload/editer/file/66765968842.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=orgullo+y+prejuicio+pelicula+completa+en+espa%C3%B1ol+youtubePDF 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_off00012040.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12040 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013852.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13852 18436 bytes
SHA-256: df47da0392db4e0aa8c4bead02b7d746376fd07af5c0ec897b50856de16957a5
font_02_sfnt_off0001681c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1681C 11432 bytes
SHA-256: 081986d78b5f2ff700a58f4223eae6dcc5ff986f430f97383b1d656dc369c4d0

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