Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3d22f92fe69e953…

MALICIOUS

PDF

88.8 KB Created: 2021-09-01 13:42:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6574f134daf858bba690332def469387 SHA-1: 117f18c943a6825018dded584dd62556381805ef SHA-256: c3d22f92fe69e953dde8e03ac4cc643fa0cc3aa8babd2be925afd06ca9441218
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm designed to redirect users to malicious content. The PDF structure and embedded links are consistent with a spearphishing attachment used to distribute malware or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//gimokimesobuzuxajit.pdf In PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/kgbj086jth5njp19anuaj0c49b/xodavexugususuni.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f720b7ec649---novukizafu.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/44049047140.pdfIn PDF document text
    • https://sibois.eu/userfiles/file/41494162342.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/48363967663.pdfIn PDF document text
    • http://xn--90aoa5aj.xn--p1ai/ckfinder/userfiles/files/jitiditi.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609000f1c2a90---vuvupumefavadovemoxip.pdfIn PDF document text
    • https://learn-atdi.com/uploads/files/libozobapudowaniberobab.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/50035072198.pdfIn PDF document text
    • http://alarmy-kamery24.pl/userfiles/file/dofopis.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160d5b7e5ad297---12460147706.pdfIn PDF document text
    • http://abogadosaguilar.com/ckfinder/userfiles/files/pokimazojenunizoxevi.pdfIn PDF document text
    • http://tsradviseurs.nl/mailing/images/photo/file/vomomivitunot.pdfIn PDF document text
    • https://www.lashharmony.co.uk/wp-content/plugins/super-forms/uploads/php/files/t98te1s356gkr8r20qrgkek50f/wipufisikalariluse.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/fdf5b45a6ebbf00b9dc6711f016bc7bc/17450341130.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b72da1378ce---20079115907.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160852213a0055---78447749159.pdfIn PDF document text
    • https://braintreeclinics.com/app/webroot/img/files/2813008163.pdfIn PDF document text
    • http://neenah1976.com/clients/17995/File/ruvivugamuwuvude.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/wozumevifepupufi.pdfIn PDF document text
    • http://hijaustabilo.com/contents//files/76425355526.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/9gkf3f2ic4l61ih8bds3u6bo3f/gexubuzububevoxes.pdfIn PDF document text
    • http://www.trackls.com/application/ckeditor/ckfinder/userfiles/files/meporumamoluladogufibem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=arielle+charnas+ruby+louPDF 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_off0000f570.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF570 18168 bytes
SHA-256: b29c238cb31798530ccda47d3c6fe525834f299e84077a8a9fbf503a76a1015d
font_01_sfnt_off00012445.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12445 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013c5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C5C 10564 bytes
SHA-256: 547523a49cd75b32fedd83505c102c860ba78c04dcbe1cc780e3283b07630502

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