Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b5a17fd4ace3727…

MALICIOUS

PDF

93.5 KB Created: 2021-08-29 21:01:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6a64c6ca9deae937b24cc0900a03ad5b SHA-1: c931ff07c00af03cc315fc1f7088a88cb1b6accd SHA-256: 0b5a17fd4ace372704684ac02002f91a9842793a90fe9f0ef722f302cb588971
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also contains a link farm pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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 http://mebco.ru/images/file/vujejoxijoxegexaradudofub.pdf In PDF document text
    • https://digireg.gr/upload/98215319199.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/4lro5qdm7isf62ruetks6jtt03/buwitudukixijegosid.pdfIn PDF document text
    • http://www.rify.us/cms-uploads/files/67981942990.pdfIn PDF document text
    • http://vin-baietii.ro/ckfinder/userfiles/files/favutalulonaw.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/rilipekabamew.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/8e8b54d01b9531b7412bb5de5d4dff9d/ralikizodiduzugegovera.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609da05f6148a---45810552946.pdfIn PDF document text
    • http://bjaimama.com/data/upload/2021/05/file/202105282356298304.pdfIn PDF document text
    • https://9ja-bet.com/userfiles/file/73414877878.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9078cc8843---41887003628.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/46015676500.pdfIn PDF document text
    • http://alternatifmedikal.com/img/userfiles/files/naliteb.pdfIn PDF document text
    • https://silatur.com/js/ckfinder/userfiles/files/92936444217.pdfIn PDF document text
    • https://livres-arts.com/ckfinder/userfiles/files/51795327749.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b648839eee---2814381923.pdfIn PDF document text
    • http://hotelgiottotorino.com/userfiles/files/88287112977.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/43708786307.pdfIn PDF document text
    • http://legalinet.eu/userfiles/files/83992864675.pdfIn PDF document text
    • https://pomacanthe-art.fr/imagebeforeafter/files/66267531218.pdfIn PDF document text
    • https://cvzona.lt/resources/img/files/98644653454.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/4e4fb5caee1be222a2c6390e8066f7f7/43977769844.pdfIn PDF document text
    • http://benhvientantao.com/img_duhoc/files/zorokujoduvuzurenatira.pdfIn PDF document text
    • http://mega-treid.com/userfiles/files/10717387749.pdfIn PDF document text
    • https://porterbrothersltd.com/app/webroot/uploads/bodelixipasosujuzatezox.pdfIn PDF document text
    • http://www.recko.ru/ckfinder/userfiles/files/98739824184.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=lightning+and+chaos+resistance+recipe+poePDF 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_off000101f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F9 19256 bytes
SHA-256: 84254f83cf905fbe8e4811d672a89c41f8462ba678742212fe9c683e691d64b4
font_01_sfnt_off000134b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134B6 10704 bytes
SHA-256: 606c46994df57773be84955d34f5e082666a2c7fba0d68640952d61e3df2982d
font_02_sfnt_off00014d04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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