Malicious PDF — malware analysis report

Static analysis result for SHA-256 f91078595c84e874…

MALICIOUS

PDF

95.7 KB Created: 2021-09-12 06:01:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1a9064ffadd2cf1d8491b6f9e6464c41 SHA-1: 50bd64304bd2b6a9d518ea0611773250ac4b1b51 SHA-256: f91078595c84e8742c0f0537123250eb6e2e166322bb5590ced49947cc23aa0c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a significant number of external links, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The presence of embedded JavaScript further suggests an attempt to execute malicious code or redirect the user. ClamAV detection as 'Pdf.Phishing.Trojan' reinforces the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://saxonrt.hu/img/userfiles/files/10042610657.pdf In PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613d2e19eb983---sutawudadijupudise.pdfIn PDF document text
    • http://lutechmed.com/Images_upload/files/josis.pdfIn PDF document text
    • http://laserinnsbruck.com/static/93061604008.pdfIn PDF document text
    • http://idrogastermoclima.it/Utentifile/FCKPage/file/zexunakagabu.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/68040911212.pdfIn PDF document text
    • http://myoffice2561.sesao33.net/UserFiles/File/77225270714.pdfIn PDF document text
    • https://contemporaryteas.in/admin/uploads/file/nutefepe.pdfIn PDF document text
    • https://kenadong.com/contents/files/vuworuxozurufixijawa.pdfIn PDF document text
    • https://ita.kru.ac.th/ckfinder/userfiles/files/judexosomexatetisodimomo.pdfIn PDF document text
    • https://allegypttours.net/userfiles/files/8179405114.pdfIn PDF document text
    • http://castel.lu/userfiles/files/98890750522.pdfIn PDF document text
    • https://hamzakocakoglu.com/userfiles/file/24880981163.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1613688ec3712e---87703670641.pdfIn PDF document text
    • http://finalstage.biz/js/upload/files/vobunakulefizuget.pdfIn PDF document text
    • http://baove24h.info/upload/files/navatiwiwinudogibosur.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/246eaa050dc3731c69be99515c033736/75489840949.pdfIn PDF document text
    • http://kolaykanal.com/userfiles/files/sebegapis.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613d352556ae4---83343263353.pdfIn PDF document text
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/nijubulutowineg.pdfIn PDF document text
    • https://spcinternational.in/ckfinder/userfiles/files/50676924853.pdfIn PDF document text
    • http://bud-med.eu/userfiles/file/vogajewu.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/9336051827.pdfIn PDF document text
    • http://kemenyseprosiklos.hu/upload/file/xajuv.pdfIn PDF document text
    • https://ajur.rest/uploads/userfiles/file/faxepedelev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=the+last+airbender+movie+streamingPDF 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_off00010ff6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF6 10864 bytes
SHA-256: 4642fd73ec2a436f2b93ba064826408b3315bd678ad9a6926b66132a7e8732f7
font_01_sfnt_off000128a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128A7 18696 bytes
SHA-256: a18afb2cc27c2c995dfb4bba445253af085ea53af67a9ddcad597c8f4b5d3f53
font_02_sfnt_off000158e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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