Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ac6b1e706bcc2de…

MALICIOUS

PDF

73.8 KB Created: 2021-09-18 21:31:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7b603edd3371d9121b6f79739857229e SHA-1: 38df052b135cc215a9f23f0ae10220469af999ae SHA-256: 5ac6b1e706bcc2deae3a44ce9d33c0b9c0d22f7c925dfe9fc57c6fbccf0062bc
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://kamakuralosgatos.com/uploads/files/3856065239.pdf In PDF document text
    • http://les-dvorik.ru/userfiles/file/negosufakapekizobil.pdfIn PDF document text
    • https://tahuacoop.com/cms_gpadmin2015/sgi_userfiles/userfiles/files/42771032429.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/28145901883.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/863d864a64b8a9c9d18bf62816bf0cc3/sibezasolosutinufudob.pdfIn PDF document text
    • http://aylabawadi.ae/userfiles/file/1885555673.pdfIn PDF document text
    • http://simonkuehner.de/gfx/userfiles/files/kidetidagijetosedetuzijif.pdfIn PDF document text
    • http://freetourscadiz.com/ckfinder/userfiles/files/16945581977.pdfIn PDF document text
    • https://ntct-dz.com/ckfinder/userfiles/files/15807517025.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/46944522480.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/1ee7af0a86ae932d3801cf3c210c7c0e/wujififavi.pdfIn PDF document text
    • https://aiwatopup.com/ckfinder/userfiles/files/jufarisig.pdfIn PDF document text
    • https://ww150002.linebot.net/upfile/files/20210913152830.pdfIn PDF document text
    • http://mariancozma.com/_user/file/22719360568.pdfIn PDF document text
    • http://paradisetnl.com/FileData/ckfinder/files/20210918_B96EEF283F96A4A8.pdfIn PDF document text
    • http://tsuiteru66.com/userfiles/file/89262827203.pdfIn PDF document text
    • https://larioenergy.net/uploads/file/97333808427.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/sizipekunexogelodumuzove.pdfIn PDF document text
    • http://www.rify.us/cms-uploads/files/79010426896.pdfIn PDF document text
    • https://myclubowners.com/userfiles/files/17135467862.pdfIn PDF document text
    • http://kmconlinecme.com/userfiles/file/juxikizef.pdfIn PDF document text
    • http://tsyrulnikov.ru/upload/file/molomitoxubibisu.pdfIn PDF document text
    • http://xn--nellieskche-0hb.de/userfiles/file/24528707080.pdfIn PDF document text
    • http://instalater-macecek.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/31609103174.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16130f8987cb01---50905212037.pdfIn PDF document text
    • http://compow.net/ckfinder/userfiles/files/gomumonenenejafovopidek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=naruto+psp+romPDF 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_off0000c03b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC03B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d84d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD84D 16592 bytes
SHA-256: 45d0cd2a38271c0987290ed0116c0dbba5d3f9045392966a8bace4bdb62dd63b
font_02_sfnt_off0001032f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1032F 10116 bytes
SHA-256: cc57ca8289f76220734da1f3ffa6a86ecd9dcd0f702ed013dc4ccdc78c947d75