Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4c5fdad935a3d73…

MALICIOUS

PDF

69.4 KB Created: 2021-10-01 04:00:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 42775899c7dbe4c5a42b878cbff6306d SHA-1: f7f5702011e4d1db944957a4bbb7af4beeb8057a SHA-256: b4c5fdad935a3d73ba7aa09c8e0a4c3d1ff64cb468ee6a7016bc77b1f84af141
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a link farm, indicating a malicious intent to redirect users. The ClamAV detection and ML classifier strongly suggest this is a phishing or malware distribution attempt. The presence of multiple links to compromised CMS upload storage and disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://moderator.lt/components/com_mijoshop/opencart/image/data/files/rukobivumofulojelowodole.pdf In PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614da5a77e7bf---namix.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/c56b1a0ceb37e18b24d856f0a4a5d63d/23313426074.pdfIn PDF document text
    • http://tnslib.su/userfiles/files/xoweraro.pdfIn PDF document text
    • http://centromedicoveterinarioadda.com/userfiles/files/rezuf.pdfIn PDF document text
    • http://fabtur.ru/upload/files/tuvugeze.pdfIn PDF document text
    • http://strelnicebudejovice.cz/userfiles/file/76350084018.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/zanajefu.pdfIn PDF document text
    • http://mamnonhieutrung.edu.vn/ckfinder/userfiles/files/wirof.pdfIn PDF document text
    • http://ledins.lv/cms/file/xagela.pdfIn PDF document text
    • http://siltherm.com/ckfinder/userfiles/files/taxamag.pdfIn PDF document text
    • http://rzn-house.ru/upload/file/39156866828.pdfIn PDF document text
    • https://peltonfell.org.uk/ckfinder/userfiles/files/53866015702.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/161544a924ee7c---21264087018.pdfIn PDF document text
    • http://thecargonepal.com/userfiles/file/xosesugexedorovizavonudew.pdfIn PDF document text
    • http://codienlanhminhquang.com/upload/files/navuputuresepi.pdfIn PDF document text
    • https://felicityokolo.com/file/mojinasiziliguwojetaguxa.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/zunevuvizobexuliriwad.pdfIn PDF document text
    • https://www.pharmawell.eu/ckfinder/userfiles/files/63844474459.pdfIn PDF document text
    • https://camgloberealtor.com/userfiles/file/51749406988.pdfIn PDF document text
    • http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/gakeronagovawudivil.pdfIn PDF document text
    • https://dom4m.by/userfiles/files/10654676096.pdfIn PDF document text
    • http://hebakotb.net/userfiles/file/tuwimoged.pdfIn PDF document text
    • http://elskenecologie.nl/files/77841746880.pdfIn PDF document text
    • http://polipadel.com/userfiles/file/sapewudivetadokiki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=music+tube+mp3+downloader+apkPDF 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_off0000b025.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB025 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c837.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC837 14916 bytes
SHA-256: 488bc07a4bbea41f6e02ea5813a0f6894b001400bbdc10fa881a84aa7bd953a5
font_02_sfnt_off0000edbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBF 11256 bytes
SHA-256: 336e98214a2e579452d0c655986b7e937156c903de681819444007d1531649da

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