Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3eb57f0e88dbccf…

MALICIOUS

PDF

78.2 KB Created: 2021-09-08 07:17:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8b7af53c377696f1e07339c80ee6396a SHA-1: c07dea1634eff8f5af94077fc586f8c4053e46cd SHA-256: c3eb57f0e88dbccfa390db5d1442c43129834ef4b7df89b5f162ebe42e936086
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1a658e027---diwiresolagopapobakomod.pdf In PDF document text
    • https://lapalettedesarts.fr/gestion/file/59934393017.pdfIn PDF document text
    • https://almuhja.com/ckfinder/userfiles/files/47681374261.pdfIn PDF document text
    • https://reaga.net/js/ckfinder/userfiles/files/pexeduvulixamibezuxutes.pdfIn PDF document text
    • https://agenciaboom.com/wp-content/plugins/super-forms/uploads/php/files/0k983qcugd91rddjlvpjmj1kg3/50897812839.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/43896985903.pdfIn PDF document text
    • http://abwingsmd.com/uploads/files/velinokemem.pdfIn PDF document text
    • http://heatherjansch.com/ckfinder/userfiles/files/tefamojogaruvoroxogipo.pdfIn PDF document text
    • https://iamtimeshare.com/userfiles/file/bikogevipabo.pdfIn PDF document text
    • https://dobre-akce.cz/media/files/file/fakubedenapibujodap.pdfIn PDF document text
    • https://408of53crownstreet.com/assets/media/files/xenizomajevo.pdfIn PDF document text
    • http://szentistvanpatika.hu/upload/file/fuzikofutisekemofo.pdfIn PDF document text
    • https://centrumschoolka.pl/photos/file/lokotufasugadevik.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/8051107612.pdfIn PDF document text
    • http://sl1971.com/clients/5/51/517263f0417f9379c67e6eba0e0bdfe8/File/kibokimunade.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138263cd0d01---70897306667.pdfIn PDF document text
    • https://jdlpartnerss.com/userfiles/file/50065608128.pdfIn PDF document text
    • http://stadion-zarya.ru/ckfinder/userfiles/files/peragi.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/8851458506.pdfIn PDF document text
    • http://ks-system.co.uk/ckfinder/userfiles/files/sulamagup.pdfIn PDF document text
    • http://aa-nusd.jp/vurifezawatotar.pdfIn PDF document text
    • https://vongtaytramhuong.vn/upload/files/jijigiluwo.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160add4445f12b---86047225377.pdfIn PDF document text
    • http://technocom.pl/editor/file/wigidu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=already+gone+sleeping+at+last+piano+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_off0000cf31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF31 10768 bytes
SHA-256: cce638f4b1e84eea7102859255dda86e7654a6c83a708a75f13c0130b3ded308
font_01_sfnt_off0000e7df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7DF 16584 bytes
SHA-256: e7b8f1658383c53e113e59b28f8b7ed2e50573fbf93e6b3dc7eefd1066076297
font_02_sfnt_off000112ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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