Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0588153b3fe50c7…

MALICIOUS

PDF

70.8 KB Created: 2021-09-04 14:52:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3aee76c0f50bd8255dfcad76aaed2e63 SHA-1: 31aac2d5328da66666676c77a3fc92d1df863229 SHA-256: f0588153b3fe50c7c85856151dbe86999184f6856449cd7c810ac6a5dd4fcaf5
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that point to compromised CMS upload directories, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16084a01fc5bf0---72630507432.pdf In PDF document text
    • http://teechart.com/uploads/images/files/46716127672.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab4bfb6a177---getaxotesanilivekubazake.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610edbe3e2b09---98681733908.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/7c5l3a7is4tiqgfl3etc2u5k30/makoboxuwebepimosewureg.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/00ffbd86d301c96b983500ceb77a4e62/49275345629.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/negowitunukegudiv.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/428d02169f0bc348fb0f1d0643243824/77561050758.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/0aab31709a5205127142a60a8568fb8d/29403642879.pdfIn PDF document text
    • https://ideylia.fr/uploads/file/39323565394.pdfIn PDF document text
    • https://ltssinternational.com/res/wysiwyg/file/kojarebajeniluwa.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/83422412579.pdfIn PDF document text
    • http://funperm.ru/content/file/64625873395.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/d0e3bad9ce96d93c9dc20695c7d4be34/77294963458.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/jomiwuwole.pdfIn PDF document text
    • http://bigpictureresources.com/userfilesbigpicture/file/91494014358.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/pepuxowufilonon.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/u31rcus9bmarm8qp5aq6j2kqv2/pupilawudenobovi.pdfIn PDF document text
    • http://atreve.eu/ubezpiecz/obrazy/file/92079419620.pdfIn PDF document text
    • http://zonweringbelgie.nl/ckfinder/userfiles/files/40015449189.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/c0a8228f55bb33c27017b5ba15c9e3a3/30520293018.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2b7e6f03c5---lodufugoritatuwifisibezun.pdfIn PDF document text
    • http://activesolutionelectric.com/images/file/figutavamofuvorage.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/ckfinder/userfiles/files/6018626975.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/0s84pmuqpa3ksvvknc6k8ht5te/12073723450.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=amoeba+sisters+video+recap+enzymes+answers+pdfPDF 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_off0000b612.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB612 14828 bytes
SHA-256: 9597873ff851804e014cb0b8db41957cab5330df9b8e27c06d3e15366a9cfcc9
font_01_sfnt_off0000db4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB4D 11180 bytes
SHA-256: dee4ffb602ec9ed4327183c4f9739c60f793dc6a28480c9eaa9b731a9a4f032a
font_02_sfnt_off0000f560.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF560 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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