Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f5b76ac0e9651e9…

MALICIOUS

PDF

78.5 KB Created: 2021-09-05 09:46:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9da94b0bf20a52f268752afffce90353 SHA-1: dce4e8f0aab0dc9fdbca6effb412fb32d0ab663f SHA-256: 8f5b76ac0e9651e94de9c19080eacd6fa2e427c024f655d2f8242eb5e0ca8416
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting an attempt to lure users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of a link farm on disposable hosting further supports this, as it's a common tactic for distributing phishing or malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://jongauger.com/ckfinder/userfiles/files/23808535842.pdf In PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098307ed29b9---dorifajiruzudajinosini.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/foroxigafegavuvukutezo.pdfIn PDF document text
    • https://promise-land.com/upload/file/62870860032.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/52480177590.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d38f93cfd2---teginuwupepusizupome.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160809d81a0c27---namumedatodamuza.pdfIn PDF document text
    • http://tuclubcr.com/campannas/file/86535790653.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/56f9e48c3b0be0ed2c7506f46feb2567/murixuko.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/88201540721.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/372f7fabf1c9e7e2355331b2f7d141e4/vajemexemeduvevozozut.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/5m4r4ctqtoqb7ooolqon5ru42c/jinudinun.pdfIn PDF document text
    • http://staractivecollection.com/resimler/site/files/80882720110.pdfIn PDF document text
    • http://kargo-box.com/uploads/files/fiwelikugoban.pdfIn PDF document text
    • http://ipublicity.cz/data/file/naruzofawezitebososodexep.pdfIn PDF document text
    • http://cpbnatation.fr/fckeditor/userfiles/file/kotebujulugesatejatiz.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b997a1d8dc1---80124927607.pdfIn PDF document text
    • http://rubensova16.cz/files/file/73616575969.pdfIn PDF document text
    • http://akademia-jedenastka.pl/zdjecia/fck/file/74222902309.pdfIn PDF document text
    • http://hermanosgolbano.com/admin/fckeditor/editor/filemanager/connectors/phpfile/votula.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/gilisovatopaxatibobipu.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/0fb7b03f85dd89c236aa490c0d111a4f/52477424792.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096fae0e2440---26973447030.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/84179056613.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=bozeman+dna+replication+worksheet+answersPDF 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_off0000cbfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e415.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE415 11072 bytes
SHA-256: acc485e47e6e6e32088cfc09e11d3be3db4d2b1178cce043c60c064fccd32323
font_02_sfnt_off0000fdc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC2 17928 bytes
SHA-256: 552b4e23b1af07f0708de5f339f6e1aec2bc825116de735f085796b40a70b091

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