Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc99ee79cb4a2ccd…

MALICIOUS

PDF

92.1 KB Created: 2021-09-06 12:17:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bff29cd7d608bf4cee2aee1db6be2729 SHA-1: ba483836ed1254ab1caaead7969627a3e779a37b SHA-256: dc99ee79cb4a2ccd450f1c8027a1ff02a23e55dd5561a35cc41064761d0e7dcb
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous other PDF documents hosted on various websites, some of which appear to be compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded URLs suggest an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9866

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://clubsecurite.fr/webroot/upload/files/ketesexugimapuli.pdf In PDF document text
    • http://tcsm62.org/uploads/news/file/81192744243.pdfIn PDF document text
    • http://asbazainville.org/userfiles/file/37119182363.pdfIn PDF document text
    • http://mitcostruttori.it/userfiles/files/68830924993.pdfIn PDF document text
    • http://aktifithalat.com/resimlerfiles/mofomoxeboze.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/7ccdc71ba1a6c8fa44c78a242610afa5/64825252839.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/14978834492.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/pv9s9u94304j2bbjihsq3l15sg/43987347199.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/25925125710.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/bafb194ddc200d9c5c25fd63bb8c68df/ruzurep.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16119c5fbe3f81---tazopowuzewanajaxez.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/tonepumizukaroja.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130521fad3fd---guradiderefuvipiriravaz.pdfIn PDF document text
    • http://dentalclinicbangalore.com/uploads/fonobajak.pdfIn PDF document text
    • http://scro.ru/pic/file/45797481944.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9b1bcd19e---28715815077.pdfIn PDF document text
    • http://lamarchesainterita.be/lamarchesainterita/imgdb/news/files/junik.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/fst1e0h3phusici55lh2nk6ej6/fojozerutixaj.pdfIn PDF document text
    • http://elencostruzioni.it/userfiles/files/44197654261.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/posimaj.pdfIn PDF document text
    • http://studiotecnicobonoli.com/userfiles/files/wawodijubugu.pdfIn PDF document text
    • https://newline-eg.com/userfiles/file/makejijefigak.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/2ea8a3b03e219021ee7d317e0bac9bbf/33181491647.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=ducky+one+tkl+manualPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d44d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD44D 1820 bytes
SHA-256: ef4c56b83544acc0eae329b123dcb13384a4443b8ee25b6b011fcec9f25c534c
font_01_sfnt_off0000dcd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f4e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E9 24896 bytes
SHA-256: d2bfb854be58ae2027f4db9edfa1f9aa42dde1511e635382f88f664efd410626
font_03_sfnt_off00013464.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13464 10340 bytes
SHA-256: 4b412bf5a1ffda9782162642d2a086ea770a9ee1ff70de1b4850569217caea71
font_04_sfnt_off00014bcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BCD 16288 bytes
SHA-256: 886f98f9a170fa47b04b3b22d9c59f03667e53e22b24a97c2bccb5aca96d4b32

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