Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5f30f5cbc9b2505…

MALICIOUS

PDF

71.6 KB Created: 2021-09-27 14:48:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 49b4c6e1b6c8749480c25b3bc02480b1 SHA-1: 6a91ef1593dc0dc58c2ab0fe6562cc103c4ab3ef SHA-256: f5f30f5cbc9b2505be3e81d433f3d1a680db6627fe49d3fe523e58bdbe70420a
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains or compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

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://garglob.ru/uplcv?utm_term=convert+website+to+app+using+android+studio PDF link annotation
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/paniwikasivolugozexuv.pdfIn PDF document text
    • http://rcp-ranstadt.us/files/zaluwiragelefubofi.pdfIn PDF document text
    • http://imapbook.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/fifudavobapelakanamot.pdfIn PDF document text
    • http://goldenbaycruisesagent.com/userfiles/file/bunilij.pdfIn PDF document text
    • https://lawweb.info/mycms/admin/userfiles/file/gosifamorosofadivebadaf.pdfIn PDF document text
    • http://studiodabo.eu/userfiles/files/55514679083.pdfIn PDF document text
    • http://maivietnamesecotati.com/uploads/files/zadamodemirowopukusu.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/fa498b25f8c5335bdb8f04ad70fbdd25/19273449296.pdfIn PDF document text
    • http://studio-castiglioni.com/userfiles/files/vujowise.pdfIn PDF document text
    • http://adm.stikom-db.ac.id/js/uploads/files/lezewevevidon.pdfIn PDF document text
    • http://scsychem.com/upload/files/19131245281.pdfIn PDF document text
    • http://tdjl.com/uploadfile/file///2021091521502293.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/b614702f787493d8c78c53641b0212ac/xivuwubamakukoru.pdfIn PDF document text
    • https://francoisdaulte.com/ckfinder/userfiles/files/marodofo.pdfIn PDF document text
    • https://greenvalleykerala.com/ckfinder/userfiles/files/zuribosezawawogapudirener.pdfIn PDF document text
    • http://087334211.kad.tw/kads/ckfinder/userfiles/files/mexamukoxo.pdfIn PDF document text
    • http://dailythang.com/userfiles/files/kanujoxajapigezok.pdfIn PDF document text
    • https://inverpalmas.com/aym_image/files/96437346044.pdfIn PDF document text
    • http://sunmoon-glory.com/web/upload/files/tepetutekedozesirivegos.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/3a9c53eb09f5ddb3333215c2ca970ccd/26295136170.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/dilevinadalovamegasoj.pdfIn PDF document text
    • http://www.ktgroup.co.uk/ckfinder/userfiles/files/31026319668.pdfIn PDF document text
    • http://s292376414.onlinehome.fr/datas/imgmail/file/bolifibosase.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_off0000b5c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5C0 10944 bytes
SHA-256: 049d89e0d7c3073b192f16a186b5e411659860c24124a5d623db878f6efcb514
font_01_sfnt_off0000cef4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEF4 16308 bytes
SHA-256: 7e5f79048515d3e5245e0fd9f00596f37f8c3b37b5a679eb435759f65257dfb9
font_02_sfnt_off0000f826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF826 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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