Malicious PDF — malware analysis report

Static analysis result for SHA-256 c21b6a5ae68d12fa…

MALICIOUS

PDF

77.1 KB Created: 2021-08-15 04:00:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 37535d1303b4bb75e79dbb72d913fa5f SHA-1: eb9a4336cbe8a3a214744b16f05f1897e55dad77 SHA-256: c21b6a5ae68d12fa47c8460f2fdd3d5beb176c55c5c4e3754c11f875cc2667c3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs, many pointing to compromised CMS upload directories, designed to trick users into downloading a malicious file. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were extracted, the structure and URL patterns are consistent with phishing and malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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.
  • 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 http://raiders71.com/clients/4/41/4134020f2f298c111575624a380fabfc/File/fibarogepujudimapin.pdf In PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a949db66917---kobagirotekuguxogawebimim.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3e8a011ba---96226753454.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1608f09374c605---tulileresewiwerofaluximi.pdfIn PDF document text
    • http://gemwishrs.com/ckfinder/stones/files/3202582979.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/h72vvvsoi84ncc8e6mcon4u5t7/38312652617.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/ff3e4144ab1f8826c424a995448e4059/tadadokaloduji.pdfIn PDF document text
    • http://moda-minulosti.cz/docs/momin/file/pemesetamedexebaro.pdfIn PDF document text
    • http://bukharasuwanee.com/sites/default/files/file/vokupivulezafubu.pdfIn PDF document text
    • http://hrudolf.com/userfiles/pugetu.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d694a0299ca---22955941201.pdfIn PDF document text
    • http://artkulinaria.pl/sites/default/files/file/91811555045.pdfIn PDF document text
    • http://capitaloffice.pl/fotki/file/tozut.pdfIn PDF document text
    • http://myboydfamily.com/clients/7/7f/7f513a2250c12de81a70a6735749c289/File/97214885678.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/76134528840.pdfIn PDF document text
    • http://lednotice.com/userData/board/file/vosefurufesuvako.pdfIn PDF document text
    • https://indobaliart.com/sitefiles/file/nugofudamix.pdfIn PDF document text
    • http://geose.ru/userfiles/file/80685741423.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f485a3990dfbe39e15de3b1b917093e3/duzapofariladokupiladem.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160daf38c00ac7---pedudupilikatigo.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/0733c9e097401a5eee69129eea657f28/xuradozuwozimikegorakegi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=tanu+weds+manu+returns+download+720pPDF 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_off0000c6de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6DE 17704 bytes
SHA-256: 557d3552cea4cb9ae858b3a7ed1bd57110a86df414d26092e3a17a450d40fbfd
font_01_sfnt_off0000f4e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010cf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF7 10900 bytes
SHA-256: ab92c518529dd098bcd32364be60c0be48e75ae4795ce85c481bf50ca98da312

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