Malicious PDF — malware analysis report

Static analysis result for SHA-256 5370c59798d43ced…

MALICIOUS

PDF

91.2 KB Created: 2021-07-05 16:02:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d06b42c02687ed162b5e177764d9874a SHA-1: 12b1c14203f8a17317c1d7efd08f3fbafc4ddcc8 SHA-256: 5370c59798d43cede3dde67c6cd4ad12a643e1f98ec45765709d198a0f34c1df
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded links, many of which point to compromised WordPress sites and disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/c94c9f3baea1437f745033071a2abe6b/zavexikovesonopiziluwezi.pdf In PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099da50e55dd---39308071257.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/sasugubojagafud.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2706e5d79---berunuxeniliweve.pdfIn PDF document text
    • http://buergerforum-tirol.at/file/72455189013.pdfIn PDF document text
    • http://snnet.kr/board_pds/fckeditor/2021/06/file/9720825460.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1609134d8aac34---xerutosotofamibe.pdfIn PDF document text
    • http://0vote.com/ckfinder/files/tudasa.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/574a2dc9ef34a13200ad6934c9593779/90951818599.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a58f8564fc5---63684240282.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/2aa12a7ab858792c1a85efe18b524995/digupomubobexoz.pdfIn PDF document text
    • https://propiedades.net/ckfinder/userfiles/files/87663037974.pdfIn PDF document text
    • https://baoyi-chuck.com/ckfinder/userfiles/files/51951468513.pdfIn PDF document text
    • https://aravlicraft.com/cmsCart//upload/file/rovabumedepomusisob.pdfIn PDF document text
    • https://ohcsi.com/ckfinder/userfiles/files/35344041903.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/dinunotawegopoxivuxisub.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7ed61d6c4---83928771804.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160b08536edb3d---sexozajebelonogagitorez.pdfIn PDF document text
    • https://motoquadro.de/userfiles/file/16209155340.pdfIn PDF document text
    • http://totaldeliverancecathedralchurch.com/clients/2/22/22dae496a1749ae881e6bee195142b05/File/35050347644.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/q982mr4ppogjage8c5d7jof68h/45768927514.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160944ee41819d---pigokuzisufoxasuxadagiro.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acc54d91b67---82104429423.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/9414b778823eea44ee5edbfb46940f79/vaxaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=unit+3+worksheet+3+chemistry+answersPDF 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_off0000fe06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE06 10920 bytes
SHA-256: 8372020283a3849b6accc6ff7ea3bf264d92bc810390700093cd2f8a647c35d6
font_01_sfnt_off00011749.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11749 18064 bytes
SHA-256: 793c9e44e637724728d476d9ded6636a434cce48c8eb9750ade1e07ac2742d6a
font_02_sfnt_off00014781.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14781 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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