Malicious PDF — malware analysis report

Static analysis result for SHA-256 3da05384939c5f29…

MALICIOUS

PDF

125.9 KB Created: 2021-09-07 06:16:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4ee61b0dc212b2597dca1c441a4e441a SHA-1: 8017d5e830538762e2a82a7b9ee8917b68c1d56f SHA-256: 3da05384939c5f293fc757bf28cb7f378e2ee9f6537f6a4ff366915a3b86e462
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9881

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://arch-teh.com/pic/userfile/2790531575.pdf In PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/d67d21296c2cfbb9556a47ffdbe277b2/nibozadeg.pdfIn PDF document text
    • http://hvezda-pardubice.cz/files/file/46032354087.pdfIn PDF document text
    • http://sicompk.com/survey/userfiles/files/44126622451.pdfIn PDF document text
    • http://semihkerpiccilervesupersound.com/upload/file/pexarinutej.pdfIn PDF document text
    • http://bong-dem-long.org/upload/editor/files/vagejewajituf.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/31780790616.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/29222918260.pdfIn PDF document text
    • http://pune-india.info/userfiles/file/56007768563.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/16107e3405cc54---22012192176.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606effc0730cf---vitawulavigiwederepaponab.pdfIn PDF document text
    • http://mvclassof1990.com/clients/8/8c/8ca0ba2c7a07c5cd1f21f9fc323c16c5/File/79813630646.pdfIn PDF document text
    • https://www.greenlakecruises.com/ckfinder/userfiles/files/51476271704.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/42792476086.pdfIn PDF document text
    • https://www.loisirs-auto-occasion.fr/ckfinder/userfiles/files/79135543701.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/b3c7eb426834785e8982f3d16d001dbb/jizokilaniwogulukix.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082aadee958b---58477788579.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/2739486021.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/26846303964.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609c49c69d6a2---bewinolajinigup.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c798ed97728---lawijagewofin.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607d80af3c9a5---vigaxobibum.pdfIn PDF document text
    • http://aircond.md/upload_fck/file/kikomalit.pdfIn PDF document text
    • http://dh-cell.com/ckfinder/userfiles/files/xufewuzomoxuzulaxax.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084df86b8380---15951681522.pdfIn PDF document text
    • http://diplomat2014.ru/ckfinder/userfiles/files/xumitavet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=intouchables+sheet+music+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_off00018567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18567 10976 bytes
SHA-256: 9b7009a257ca80f98cc200ac63e2b1be80dc29043ad1a62b1ebef26e8dd251bb
font_01_sfnt_off00019e71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19E71 19484 bytes
SHA-256: 6ca58da581551844631d175c1bca112fe17de254f9f55b43291df6c891ea67be
font_02_sfnt_off0001d1c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D1C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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