Malicious PDF — malware analysis report

Static analysis result for SHA-256 9455fef6ec6eb4d4…

MALICIOUS

PDF

79.7 KB Created: 2021-09-17 07:28:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 9b596dc2536d024946eae50c80cb9e07 SHA-1: 098ed3b780476dbe462386c4634552efd9abbf43 SHA-256: 9455fef6ec6eb4d46008d15009a831e2add51c5df9de418251b4774ac39c0d7b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as containing a link farm and was classified as malicious by an ML model and ClamAV. The heuristics indicate a high number of external URIs and links pointing to potentially compromised or disposable hosting, suggesting an attempt to lure users to external sites. Although no scripts were extracted, the structure and heuristic firings strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://hanomanberjaya.com/contents/files/najulon.pdf In PDF document text
    • http://bmcnx.com/userfiles/file/sepuvob.pdfIn PDF document text
    • https://hssanesteban.cl/files/kobijolodemimalozamukamak.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/63c3bddb4ac76d48af623f1a866c2988/36909157368.pdfIn PDF document text
    • http://safiorida.dk/operatori/userfiles/file/43534376553.pdfIn PDF document text
    • http://votejoedestefano.com/editorData/file/ledizawowivafaka.pdfIn PDF document text
    • https://espiber.cl/images/uploadedimages/file/dafanomolojolonimud.pdfIn PDF document text
    • http://maihome.hu/admin1/file/13363173469.pdfIn PDF document text
    • http://www.espaciocultivarte.com/ckfinder/userfiles/files/48115013357.pdfIn PDF document text
    • https://jairdefreitas.com/ckfinder/userfiles/files/93924846063.pdfIn PDF document text
    • http://maurovalleferroarchitetto.eu/userfiles/files/68448370748.pdfIn PDF document text
    • http://inciboya.com/resimler/site/files/dekemukewizamenuz.pdfIn PDF document text
    • http://entrackintl.com/uploads/sibexogarakidup.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161391150145ff---14092755390.pdfIn PDF document text
    • http://xn----9sbbnbtte4cyg.xn--p1ai/ckfinder/userfiles/files/tomifom.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/ad2dddab7df3cfcc9a4ddced8d10f1cb/40000382899.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613689690a015---kitesejow.pdfIn PDF document text
    • https://bomando.bomsolar.com/uploadfiles/files/siwixesedozoxujadid.pdfIn PDF document text
    • https://kawanmto.info/contents/files/tirojofupitela.pdfIn PDF document text
    • http://zenobiacultura.it/userfiles/file///45698611816.pdfIn PDF document text
    • http://abwninemile.com/uploads/files/jedafukabos.pdfIn PDF document text
    • http://nuklearmedizin-amro.de/userfiles/file/tulevusogafovada.pdfIn PDF document text
    • https://morganmethod.tuesdaytrader.com/ci/userfiles/files/favobotaxubolamomipoxox.pdfIn PDF document text
    • https://gitteszoneklinik.dk/ckfinder/userfiles/files/kukijezubepuwasuj.pdfIn PDF document text
    • http://test-immo.com/file/33521352643.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=lean+thinking+book+pdf+downloadPDF 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_off0000d466.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD466 16968 bytes
SHA-256: 6e5e69b0ccb82051862223f118212b24ccbe3a6543c1719982ea4964d7dee4be
font_01_sfnt_off000100a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A8 10784 bytes
SHA-256: 8885528c7ed116c3293d603ea42516435352db85b0d0e9c91b4f27e7a1340c6b
font_02_sfnt_off00011903.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11903 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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