Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8d8f79109c6cb5d…

MALICIOUS

PDF

92.2 KB Created: 2021-07-29 09:42:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6abdbb9873291f78b98909968f2b0417 SHA-1: 58455f768128789fa4fe02f7b30cd376bf15d10d SHA-256: f8d8f79109c6cb5d74bd05424c9fff13c8b79584a71722acacdecf3c4f32b898
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to malicious sites, contributing to a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9866

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.
  • 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://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607c405c1feaa---45395684004.pdf
    • https://ht-cooling-j3t.com/contents//files/23424455353.pdf
    • http://brooklynsmokeshops.com/admin/images/file/16260644773.pdf
    • http://tauben-buchmeier.de/kleinberliner-schuetzen/userfiles/files/nemofozoramukib.pdf
    • http://isdoor.ru/uploads/files/25887018867.pdf
    • http://hjtech.org/admin/upfile/file/vabosejonedanokiliz.pdf
    • http://lubrifianti-auto.ro/files/file/79807342970.pdf
    • https://autotrans911.com/thread/admin/uploads/file/43295730090.pdf
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088e8ca0bbed---lonogevexedovexagaxutape.pdf
    • http://urbanconstructions.org/images/uploadedimages/file/jiropiwejopebate.pdf
    • http://thegibbsfamilyreunion.com/clients/d/d9/d929505c7faf6263097cc97620c39d65/File/zifuze.pdf
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16071c813cbfbe---52197335845.pdf
    • http://provia-events.de/pics/fotos/1/file/regojukebiwezogesuzu.pdf
    • http://streathamtaxi.com/survey/userfiles/files/42537055679.pdf
    • https://lensprovn.com/ckfinder/userfiles/files/3214643598.pdf
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a78a0930214---32693356765.pdf
    • https://tonitomov.com/picture/file/27307249035.pdf
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/744b5ebb032b1ad43bfe7e95e14f287a/pasuzadaxuv.pdf
    • https://ratsimae.ee/media/contents/file/zutetokusutokenibikigur.pdf
    • http://feynburg-uhren.de/uploads/kefomolibizoji.pdf
    • https://sasalidayanisma.org/uploads/file/tixijipamiwupil.pdf
    • http://amandatour.ru/js/ckfinder/userfiles/files/pozizanipewojewa.pdf
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/3612rrp8cktcm3b9iarakttutd/jaluwejafuwowi.pdf
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160a53d2689a27---14621909659.pdf
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160871163ca525---70730036329.pdf
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079559027148---81472569809.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/v4sdlukvhet917lj0rh6f91495/gokevunepufewobidarosu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=guide+to+tarot+card+meanings+pdf+free+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010177.bin
ed916aab986a76334a57a8163ca8de9b9e3ab289d91bca247cfa7e1e682127f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10177 17520 bytes
font_01_sfnt_off00012f20.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12F20 16792 bytes
font_02_sfnt_off00014737.bin
dd400c2d4a8650f6a2ca0c06a446d70bc8b41df8dea591fcbe5d18f440fe29f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14737 11188 bytes

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