Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c05f178da82448f…

MALICIOUS

PDF

69.9 KB Created: 2021-09-28 12:36:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: abfcd23652ec1943fc7f203053dab664 SHA-1: fc3b6910efb83a058f064516857052cc44c7a6cf SHA-256: 6c05f178da82448f55e17670216d6184a66ac0719de73a16a67345d22d916601
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for malicious PDFs to execute code. It also features a link farm pointing to compromised WordPress sites and other domains, likely intended to redirect users to malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or scamming operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://huntic.ru/uplcv?utm_term=android+payment+app+source+code PDF link annotation
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614095690bfa5---6106773792.pdfIn PDF document text
    • http://envigest.cz/upload/file/salubilozaxorudaxuniju.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161453106be6f6---83699233202.pdfIn PDF document text
    • http://phutungototuanphat.com/img-tvdl/files/dekedoz.pdfIn PDF document text
    • http://vdtonline.vn/static/uploads/editor/files/kefogedisusita.pdfIn PDF document text
    • http://girlstown.org/files/js/ckfinder/userfiles/files/36277594716.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/poxuzusawesugafimazed.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614030969cc41---wezoxij.pdfIn PDF document text
    • https://samsungklima.net/upload/ckfinder/files/35574016835.pdfIn PDF document text
    • https://techlan.pl/files/file/36579027431.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614d00156fe50---88551028090.pdfIn PDF document text
    • https://piti.leaddeehub.com/userfiles/files/55168380419.pdfIn PDF document text
    • https://haysalon.com/public_html/userfiles/file/59967869949.pdfIn PDF document text
    • http://beiks.info/public/file/lejeke.pdfIn PDF document text
    • http://feuerwehr-mittenwalde.de/mediathek/files/4043607510.pdfIn PDF document text
    • http://48bulls.com/js/upload/files/bekutovej.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/7c086ba228f8af5c7e646809852cd5af/nikotazinupo.pdfIn PDF document text
    • http://euro-ex.net/images/blog/file/fobotagibedipapim.pdfIn PDF document text
    • http://konberdbio.com/upload/files/27335593307.pdfIn PDF document text
    • http://xn--2e0b95unoa536adofm5h.com/userfiles/file/23355047220.pdfIn PDF document text
    • http://elite-nails.pl/Upload/file/38703776244.pdfIn PDF document text
    • http://togclick.com/media/userFckfiles/file/romuvoxas.pdfIn PDF document text
    • http://myphamhelios.vn/luutru/files/golifuru.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_off0000b09a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB09A 15124 bytes
SHA-256: 439487c852b06410ede7571f5dc15e35974e261622b47ddb95cefa597daee756
font_01_sfnt_off0000d6fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6FC 10824 bytes
SHA-256: 260da133df4a6ebfdb578f3c6f9d98cac87faf761a8c668a49d435b9a74682c9
font_02_sfnt_off0000efff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1