Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea456cc2ddff947e…

MALICIOUS

PDF

83.5 KB Created: 2021-09-07 17:01:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 5bfdf237e96ff35b049260a5feff5327 SHA-1: 1a12da89dc6c5a8a2c16336a9136e6de7dc5cb03 SHA-256: ea456cc2ddff947ed5513ae6a9804245f8ecf60d8bbe5b6bd987d909d19e805a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://come2menorca.com/images/file/demebepekogiwajetad.pdf In PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/071da3823662f9d8c49c881890c194e4/33663296411.pdfIn PDF document text
    • https://noddy.nu/images/file/dofetekuwobijuru.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/84f275435b161ac3d7d25b7c154aedd6/5932793222.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607609abf1106---25912871068.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///netebilufisuxa.pdfIn PDF document text
    • https://bibliotheque-des-arts.com/ckfinder/userfiles/files/15053589115.pdfIn PDF document text
    • https://wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/577724762.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0e0c607fe8---57720412767.pdfIn PDF document text
    • http://talleresjpg.es/img/file/37881706444.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16094833a3ed6f---zezobotamanalibupudal.pdfIn PDF document text
    • http://epoxidice.ro/mm/file/95729985222.pdfIn PDF document text
    • http://futurepoolandspa.com/ckfinder/userfiles/files/sorivizuvopopi.pdfIn PDF document text
    • http://ok-poland.com/userfiles/file/wajiter.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/22189476763.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/files/dopituzimupulusuku.pdfIn PDF document text
    • http://movesearchesuk.com/userfiles/file/matalijape.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1612deeff625fd---tejemimam.pdfIn PDF document text
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1de2abc72---foresuvusuv.pdfIn PDF document text
    • http://4darchitecture.org/img/all/fisarupubavunup.pdfIn PDF document text
    • http://xn--42-jlclgg6a3e.xn--p1ai/userfiles/file/86084676758.pdfIn PDF document text
    • https://ijtm.in/userfiles/file/dizibavusilipiwabivadoz.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/72a8e14449b246421e12d9d1e54a3e2d/mafagig.pdfIn PDF document text
    • https://rrr71.ru/upload_picture/57777620436.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=cope+acute+abdomen+pdf+downloadPDF 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_off0000dde1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F8 10776 bytes
SHA-256: 6331d08c1a6b7f190e768e76c88ca4cab79fd87408748700c3071f5274c05427
font_02_sfnt_off00010e9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E9E 18852 bytes
SHA-256: 4fc37f72404bd7caf99d27e5f0f4152dca2b2c4a75cc7763a723ee3a8f97e245