Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4f160c895f1862a…

MALICIOUS

PDF

108.1 KB Created: 2021-07-21 21:59:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: ea842eb177e2bd7e9dcef72a5c620b60 SHA-1: f52896462e09ac85f778de1e060be886c223b242 SHA-256: d4f160c895f1862a76cfc0fe0af52d9359ba10b10dcf9e3f20d95119a2a98682
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. Additionally, it features a large number of external links, many pointing to compromised CMS uploads, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://miaousland.fr/ckfinder/userfiles/files/pisowinesifizagebe.pdf In PDF document text
    • http://www.sas.edu.mn/ckfinder/userfiles/files/nepiduvufixaxibetojowerok.pdfIn PDF document text
    • http://lagrupacio.cat/file/38525070727.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/a29a029b66c339eb3411fea7dcc3e08c/nipamobamogoviwumotisur.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160ace9b0dbfaf---84593822730.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/rukotofesasotolubet.pdfIn PDF document text
    • http://pensionpoint.cz/userfiles/files/90765481662.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/323106592520decdfa3c8e6693578f62/puditavaxajagimewemosawib.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160754a247ec9a---92106726591.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/7589489044.pdfIn PDF document text
    • http://ramseier-appenzell.ch/elrada/js/ckfinder/userfiles/files/82103585220.pdfIn PDF document text
    • https://www.saammohaseb.ir/wp-content/plugins/super-forms/uploads/php/files/ef21006ac3051e6dec1e1fc07348633a/vedexuw.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/dibuxexitixerevetak.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/fopulazofepetiposiv.pdfIn PDF document text
    • http://phunggia.biz/userfiles/file/ruvafet.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/dbce6ad3261988d460eadba60d48f897/79363624700.pdfIn PDF document text
    • http://djpress.pl/Image/files/38805420383.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/pezaruvinetize.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081a099b4169---xaduwafi.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/8bda336e4eba65cf608352ace3be9b9b/66683242938.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/81640740745.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a16041267e9---81334402810.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/76399240012.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e36137089---37112158569.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=why+was+the+indian+peace+commission+plan+doomed+to+failurePDF 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_off0001420a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1420A 11176 bytes
SHA-256: 49e72742b0a8a3bb7fdb0c4552f08219d6a78bc1d9e607f8100ac74f8597dbe2
font_01_sfnt_off00015c01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C01 17432 bytes
SHA-256: 5af6cc52af69ef203901222e6e5d023bf045f0b2c7a3e098afa948a48f32adf6
font_02_sfnt_off0001899a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1899A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1