Malicious PDF — malware analysis report

Static analysis result for SHA-256 09390a129cf3333c…

MALICIOUS

PDF

73.3 KB Created: 2021-09-04 08:05:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e62f58c264c4e51380076df092835903 SHA-1: d5a6d0d8ef1acf53bbcad9e68b85be61cedda32c SHA-256: 09390a129cf3333ccdb67ded08424499b608369bca2cb29cfb40511d41b690e0
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://primaneighbors.com/userimages/finonifuxamixilubupuwalir.pdf In PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f052eac89a0---1137487451.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/67284383712.pdfIn PDF document text
    • http://akwarella.pl/user_uploads/file/81962686819.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/nepetot.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/aa596749b393c9d66d0978f49c356fce/70144959050.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/koxekuxilanujupakeriti.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/6gmli1s9rvhlkiq0nrelkk0j9h/soxedapaxumetaj.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160860a26585ed---wosugosizalizagatugifid.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/2585971417.pdfIn PDF document text
    • http://xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/didozudimanaz.pdfIn PDF document text
    • http://renknh.com/ckupload/files/73308782475.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/vj70md70rfmf96bmk52rfdtq3l/96488245941.pdfIn PDF document text
    • https://j-kowalewski.pl/uploads/userfiles/files/82672323499.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611e289d2a927---ziranidowezalidin.pdfIn PDF document text
    • https://rajatotogroup1.com/contents//files/67243325577.pdfIn PDF document text
    • https://rijst.nu/userfiles/file/gaberoreto.pdfIn PDF document text
    • https://clubesolbra.com/uploads/files/kelovug.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160fcd1e67e377---ropilorelipupajap.pdfIn PDF document text
    • http://josephlillianmorrisfamily.com/clients/59960/File/jelivasof.pdfIn PDF document text
    • http://selmanoglusigorta.com/userfiles/file/66285607875.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd93765adb---jonivekilolejudojazane.pdfIn PDF document text
    • https://spotiverify.com/ci/userfiles/files/45248115499.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=basic+computer+notes+in+kannada+language+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_off0000ba64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d276.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD276 16920 bytes
SHA-256: dd42b9f8aa5866e71db4f206370a153eeedd457a2ca8ebb97eeee0d1938efd7f
font_02_sfnt_off0000fd7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD7F 11208 bytes
SHA-256: d40b21fbaef53442eb043f0e276ceec88f82143b8fb86ef8716e94d6cc5cecdd

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