Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdf8f138bb16ab43…

MALICIOUS

PDF

81.9 KB Created: 2021-09-21 20:09:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 75571c1e5f064c510cdf8ddb43cef42d SHA-1: e0e6c7bcae2e0b5b9818f8fc2145f57f984d7315 SHA-256: bdf8f138bb16ab4372e96507a097438d4185c8e7552ff1d68d68f24fcb92982d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://inwebjor.ru/uplcv?utm_term=vidmate+free+video+downloader+app PDF link annotation
    • http://hum-lucknow.org/test/fckeditor/file/92008491875.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/161405037bd485---vosapelerapedipufegeli.pdfIn PDF document text
    • http://louisamerino.com/userfiles/file/36694929210.pdfIn PDF document text
    • http://imcborivali.org/userfiles/file/nogerawoginepesagufobenij.pdfIn PDF document text
    • http://appinaris.net/ckfinder/userfiles/publics/files/25364681155.pdfIn PDF document text
    • https://festival.bg/fckeditorfiles/file/2983516881.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/5cd4159a828bc8158cb23db0788cf04a/regifojaxakosubemavafo.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141108a66fcb---16459165552.pdfIn PDF document text
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/sofezupelolizo.pdfIn PDF document text
    • https://gadd-asso.org/userfiles/file/zafabobekalisesujugobewe.pdfIn PDF document text
    • http://synergytaekwondo.com/click2buy_newp/userfiles/file/36287379257.pdfIn PDF document text
    • https://happycondo.leaddeehub.com/userfiles/files/79389771449.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/35773252496.pdfIn PDF document text
    • http://fioredda.com/userfiles/files/sipesudolabezadizo.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/b513d8672e866e4e89ff5371837842ab/wufikuketoxudoninosuvo.pdfIn PDF document text
    • http://saatgaamkansarasamaj.com/admin/uploads/files/28011917713.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161303d8d40d2e---sosupudosoliwumixulusebof.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/0p9hkusj0sg22rkmlb9i9cd735/28059992983.pdfIn PDF document text
    • http://balmybnb.com/t/tutorfirm/uploads/ck/files/nevifajawitoxezig.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/6f2f2da8bad62764e2305067279edf6e/kaxabikorabigiwuvilafonol.pdfIn PDF document text
    • https://libertyrealestate.in/ckfinder/userfiles/files/vuzowanivolenalabip.pdfIn PDF document text
    • http://drsrkbedcollege.com/ckeditor/ckfinder/userfiles/files/69203131353.pdfIn PDF document text
    • https://soportedevida.mx/ckfinder/userfiles/files/mopoparanegevogefu.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_off0000dbf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF6 10612 bytes
SHA-256: 544a7f92f6fd3826b5efcc29f1627d87851d32a5cb33d83ea436ea2c5311a677
font_01_sfnt_off0000f42d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF42D 17816 bytes
SHA-256: db1c5643a9fa6e8eb27da79ca09c68e449aab779306b90cc79e18b1a227d55df
font_02_sfnt_off00012201.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12201 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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