Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec1b896384b06ea4…

MALICIOUS

PDF

81.0 KB Created: 2021-09-02 03:50:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5405a6101b9bf0d708b12ab99991339f SHA-1: a8d44a2594977e7f79b879cc862256a3b84e0176 SHA-256: ec1b896384b06ea42bdedc5145098a5b76d6fcf85538e768dd7a3a847d3c9455
196 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document's content likely attempts to trick the user into installing a fake browser extension or update. The numerous embedded URLs, many pointing to compromised CMS upload directories, suggest a distribution mechanism for further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://psychologgia.pl/Upload/file/20042889146.pdf In PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/b81c2663ac1b51955706b865a70d06d9/30881249850.pdfIn PDF document text
    • http://dakmoto.cz/obrazky/file/64819780765.pdfIn PDF document text
    • https://wagaskar.com/media/25297886037.pdfIn PDF document text
    • https://drrajanmahtani.com/userfiles/files/62963839204.pdfIn PDF document text
    • http://gelikonline.ru/content/Files/26062834097.pdfIn PDF document text
    • http://droneducational.com/admin/userfiles/file/lapaxefusanev.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7cc2ea2289---7237046573.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160705023eecac---mufiremoxukepezupapu.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/7fd59a14c30cbac321a0eea91bb2c924/41986910116.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa6417bbd68---56117983564.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096827e99c82---20277193312.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1d5c82072---soridufatimugoxowakulufi.pdfIn PDF document text
    • http://havadisname.com/upload/ckfinder/files/viborijawapo.pdfIn PDF document text
    • http://kmbb.at/userfiles/file/lovimaxedase.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/rq9sqrpggre2f38noidqn8o092/49306015139.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/4d44c740579a25b68d80be804e983606/jaraxudofozofamep.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607aac11801e9---pirifo.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/bad3dba02529af48b9054b3900ef90f3/tomodikakogomowiwo.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/0s7vdn4jsabp781ujevdnuvip6/ropigigexezijotobur.pdfIn PDF document text
    • https://bursakaynak.com/userfiles/file/29497457778.pdfIn PDF document text
    • http://yuha.be/_files/file/14685645978.pdfIn PDF document text
    • http://cokhiminhhien.com/media/ftp/file/56340750469.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=eng+to+gujarati+dictionaryPDF 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_off0000d6a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A9 17796 bytes
SHA-256: 73104c2cecb5571bbfa31319e34ab758cfa88d79198aac6f88a6d7584e918d2c
font_01_sfnt_off000104bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011cd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD2 10524 bytes
SHA-256: 6ecd92f9f19796f05df3bcc61fe4826e07a375e23c484c7b0102e1f6ce5f166c

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