Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfb8c1bd5502a25f…

MALICIOUS

PDF

91.2 KB Created: 2021-08-01 02:46:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: feebddc66524c67d8a30812f708dbb77 SHA-1: dcc5e7d85180c2f6fa218154fde62c7b61295244 SHA-256: cfb8c1bd5502a25f694db65b27bf1756f467b1c6a14b3a03c12d9b3496b08ad8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a distribution mechanism for malicious content. The presence of a visual download button lure further supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://huntic.ru/uplcv?utm_term=arunachalam+full+movie+download+moviesda PDF link annotation
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d6345a044b---16330593205.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/67533868275.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16103e86131519---vixadepeziveviga.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098b85d0d5ad---timomebapoxorofanisogifur.pdfIn PDF document text
    • http://filatelianumismaticaumbra.it/userfiles/file/binibevubapuzoditunop.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/59481962222.pdfIn PDF document text
    • https://nguyenvanhuongloc.vn/app/webroot/files/images/pages/files/pixiperet.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160846b635ba69---zeruviwexetekibu.pdfIn PDF document text
    • http://zuche0551.com/upload/file/pozufagijepejegaga.pdfIn PDF document text
    • http://from.ua/upload/articles/2021/06/21/files/kifisoxefukuwe.pdfIn PDF document text
    • https://www.tocbirsen.org.tr/ckfinder/userfiles/files/diloxaxotaxapuxuse.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16090ad09117e9---zizunobamikofusakok.pdfIn PDF document text
    • http://mosjob.ru/images/file/59311132289.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/habi4irmboru4hke25cvb7qcoi/teponudonupuw.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/ff769144215bd76e60f4a2b4adf66e42/gonoxibuvejuvovolomubetag.pdfIn PDF document text
    • https://bbgpiti.com/userfiles/files/18136941120.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2a6379ebe---41028464268.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/qsuhpj8pbeqek64p4a9cvd1av1/85418002560.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/k5frf9e05vv26u1o909d2m32s7/18872750995.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/728a853bd050dceaa4ceb5295386568a/tuzonenalerido.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/46345a32f26de93a33db95eea66a650c/14935686321.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/5c164b860df712a72a766a4754784740/36020315869.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/mumavixumise.pdfIn PDF document text
    • https://ariaparvaz.com/basefile/ariaparvazcom/files/51824942148.pdfIn PDF document text
    • https://fobh.net/userfiles/files/wawewerexigal.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/a1d56c3d69a33bb726799b8dea0a0308/vulofomono.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/10220278630.pdfIn PDF document text
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/8684a12371411c27fcdec0ac38dc4eba/jilitafukuve.pdfIn PDF document text
    • 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_off00010141.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10141 16988 bytes
SHA-256: 67870c5f86c152146f382ba865906703816c50006209b21754dac678b3b4d68b
font_01_sfnt_off00012d8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D8A 10876 bytes
SHA-256: db035c52480e5af08c987da6a1e42b85dc33f5ce0c6fcbdb2f307ea8f518769a
font_02_sfnt_off00014687.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14687 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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