Malicious PDF — malware analysis report

Static analysis result for SHA-256 84fc1a52fa055b99…

MALICIOUS

PDF

90.0 KB Created: 2021-08-14 23:47:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 815b25009e93f2cba1c6b0466577b0ea SHA-1: feda6c0874b863c2802f9bd8e22f530aee377986 SHA-256: 84fc1a52fa055b99e92768839c8aafc96ee2347e1d45365857432ed964d9b151
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and numerous links to external PDFs, many hosted on compromised WordPress sites. The presence of a 'Password-protected archive handoff' heuristic suggests the document is designed to trick the user into downloading a password-protected file, likely containing a malicious payload. The embedded JavaScript and link farm indicate an attempt to deliver a second-stage exploit or malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 9

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160b91b69ce9e9---najaxudodemofor.pdf In PDF document text
    • http://ptairsupply.com/userfiles/file/79826054656.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e58e42b784---wezosewoma.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f9198c63131---73669158664.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/19105473610.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160edd29b6febf---37212822373.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/xuzagesisexidi.pdfIn PDF document text
    • https://siriusdynamics.com/assets/uploads/files/bolunezutopupojiraworom.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d2026c4eafc---fisos.pdfIn PDF document text
    • http://3dsami.org/uploadfilefiles/makobunulutoluwe.pdfIn PDF document text
    • http://shriadinathbank.com/uploads/gorugarafejivuzuk.pdfIn PDF document text
    • http://taskentcompany.com/userfiles/file/61298798766.pdfIn PDF document text
    • http://artistalexanderkanevskywinnerinternationalaward.com/clientMedia/file/tawotofozinoxe.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bef75cae3e---xowunudivibi.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/cd5fa5bc0b2fc6efcab9dcbbf3658065/nabiku.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/4vccf1c254seeeu6g4udfnl4v3/domefobo.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608e07454601d---poxojuzijutizalubewubun.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d66a3dbb1ec---5339006137.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/cced198f22d54a72b449efa8eb1a1a38/38083322101.pdfIn PDF document text
    • http://fabtur.ru/upload/files/nabajitiret.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/9a659306a4d9cc1d90ecacfa0168936c/gujewufe.pdfIn PDF document text
    • https://srldirect.com/ckfinder/userfiles/files/kolipudiro.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/wufugezunakumube.pdfIn PDF document text
    • http://xinyaoqiye.com/upload_fck/file/2021-8-14/20210814082430568642.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=la+casa+del+lago+pelicula+completa+en+espa%C3%B1ol+latino+descargar+megaPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e93d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE93D 2768 bytes
SHA-256: 33d3df52db7ae033f077b5f4f891eaff1edef061b2090b1eacbcebb2d2900774
font_01_sfnt_off0000f4aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AA 18796 bytes
SHA-256: 9b37ba6776fdecc03304567d4967b8f275032545eb072fe4f2b39487ff960122
font_02_sfnt_off000123fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123FC 11120 bytes
SHA-256: e9f7c29255e0a348bb6bb2e6223f3f3ab536acb09094dd6825a099ea1b655bcd
font_03_sfnt_off00013d7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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