Malicious PDF — malware analysis report

Static analysis result for SHA-256 853061b9998069da…

MALICIOUS

PDF

83.9 KB Created: 2021-09-21 01:53:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 688c63914e2b09648979adf291cff95c SHA-1: 684f94c73f4b738ef344fc05895b135ccb3338d7 SHA-256: 853061b9998069dad5ac3b0646533e82cad584b09a465de2c12c3c8447030ab6
212 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document contains embedded JavaScript and multiple external links, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to distribute malware. The presence of a 'password-protected archive' lure and a 'download button' heuristic indicates an attempt to trick the user into downloading a malicious payload. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • 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.
  • 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 https://mbbs.hr/files/58340234973.pdf In PDF document text
    • https://transport.frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/mufiviborufafivulojivul.pdfIn PDF document text
    • http://wrtour.com/FileData/ckfinder/files/20210913_2E51F015E360DCA5.pdfIn PDF document text
    • http://2018.letnifestiwal.pl/ckfinder/userfiles/files/16786147999.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/josomazunuparerivujomaji.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614138bbb2454---39440380369.pdfIn PDF document text
    • http://esteticka-stomatologie.cz/files/content/file/74094041943.pdfIn PDF document text
    • http://namhungholdings.com/uploads/ckfinder/files/51711270582.pdfIn PDF document text
    • http://systempro.kr/userData/board/file/vapamojuzematowemoz.pdfIn PDF document text
    • http://kamerton.nl/clientfiles/tatapevekurorero.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fcf158dbd4---14131821230.pdfIn PDF document text
    • http://darstin.com/userfiles/files/82815502514.pdfIn PDF document text
    • https://kstraders.com/userfiles/file/jigerozepukivozakubi.pdfIn PDF document text
    • https://xosobacninh.vn/webroot/img/files/75039841387.pdfIn PDF document text
    • https://unitedpetexpress.unitedreloth.com/ckfinder/userfiles/files/20624701858.pdfIn PDF document text
    • https://www.burnat-provins.ch/ck/ckfinder/userfiles/files/savevovazojonemuxa.pdfIn PDF document text
    • https://f2h63c2.ip4secure.net/upload/files/56256248963.pdfIn PDF document text
    • http://davcpundri.com/css/file/48540703899.pdfIn PDF document text
    • http://bhttourist.com/upload/fckimagesfile/25065998501.pdfIn PDF document text
    • http://diagnosticaedilizia.com/userfiles/files/razanigowat.pdfIn PDF document text
    • https://www.carnesvarejo.com.br/assets/ckfinder/core/connector/php/uploads/files/jadebipam.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/cn7jocaa3anc3euo4bjtvoe1j1/7631500613.pdfIn PDF document text
    • https://deltarents.com/upload/ckfinder/files/buvonugudefobunepukidapev.pdfIn PDF document text
    • http://quimis.net/js/ckfinder/userfiles/files/69475977871.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=max+payne+2+game+free+download+full+version+for+androidPDF 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_off0000e097.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE097 11324 bytes
SHA-256: 0728303ebecb9e5ada8b714ea1aebc34af20185c3bd63cc1f62a7b1470002a2e
font_01_sfnt_off0000fb21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011333.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11333 17776 bytes
SHA-256: ac59d157b2e554d17d725a1c1d0714a376d3920d82a6b30f048bd8069353b6d1

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