Malicious PDF — malware analysis report

Static analysis result for SHA-256 84e8674f5effb059…

MALICIOUS

PDF

93.5 KB Created: 2021-06-28 20:41:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 3d61ea796cbd7e2697bba0b455cff2da SHA-1: a0c254ca7dd062428f63fbc1e23fabe47fbcc4a5 SHA-256: 84e8674f5effb0596467affec320ea5d5511baa9dd10b1ccee3fef0fc72fb2b3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document contains a large number of embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the nature of the embedded links and the phishing/trojan detection strongly indicate a malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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 https://archism.ru/uplcv?utm_term=grammatical+words+in+sentences+are+called PDF link annotation
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16086e39e8c54f---61334844166.pdfIn PDF document text
    • https://www.explosivo.gr/wp-content/plugins/super-forms/uploads/php/files/f3d9b31e471bc147ef0cd186560c17ff/7152136382.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160d76520e1f70---xamenodudovo.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/67im80bn7canmirqugru51sr9b/50813553013.pdfIn PDF document text
    • https://esz.jp/img/editor/files/90130922150.pdfIn PDF document text
    • https://transpack-krumbach.de/_upload_bilder/_filemanager/file/lekofekave.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/zazevidejunuwen.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160942794a6ed5---numerepesikuxi.pdfIn PDF document text
    • https://zionapostolicministries.org/uploads/file/newulizurukijorukeb.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072d88d5e38d---61366966003.pdfIn PDF document text
    • https://goldenapp.net/file/45382875928.pdfIn PDF document text
    • https://aterhesseg.com/up_image/file/53860087140.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/52571447581.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca4c773e52---kubisifiwona.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b88ae93cdd0---jawixavuposojeze.pdfIn PDF document text
    • https://podereilmontaleo.it/writable/public/userfiles/file/womum.pdfIn PDF document text
    • http://janandpoos.com/clients/872640/File/degorodevubazataligo.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/799272635.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/5a85b5jhquqrvmojvp3fad18dc/9832196947.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/3f70763949c5ae5975e5ed1fadf58ecf/84704442079.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/5ee76b9b580da994fb7cf518139318c4/xipubu.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/i6oqqoelrhi0592hfm5hjtkngf/77336151398.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/mivojovas.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/pvo3o4c9hlieg0s2ehseo9qsn1/fipukotapulakeja.pdfIn PDF document text
    • http://charivne.info/images/file/tobidefofunisuxujizidig.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_off00010c93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C93 16652 bytes
SHA-256: cde61fc4cf524073443af4da04b4e16c44ddabf7b37bb0bf19eb8040e69fcd4f
font_01_sfnt_off000137cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014fe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FE3 10656 bytes
SHA-256: 66931dda93b532c042c117f6516892b62361da0b81c41b895ececc15c614a010

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