Malicious PDF — malware analysis report

Static analysis result for SHA-256 66ecc2edc5666ec5…

MALICIOUS

PDF

81.7 KB Created: 2021-09-09 11:33:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9469faa4036388f317f6d2b743470780 SHA-1: e7be266ab4e532dc4f085308ec8cfe3afc785af0 SHA-256: 66ecc2edc5666ec58bebf4697842dd93ee9768ea5c7befd4acbf1ccbac065868
196 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing and trojan delivery mechanism. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document attempts to trick the user into installing a fake browser update or extension, a common social-engineering tactic. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it is designed to host and redirect users to malicious content, potentially leveraging JavaScript for execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://areaengineeringsrl.eu/userfiles/files/92864520114.pdf In PDF document text
    • http://formpart.com/upload/ckfinder/files/75819035235.pdfIn PDF document text
    • https://photojet.net/userfiles/file/jutemopifa.pdfIn PDF document text
    • http://www.siphonicflowmandiri.com/upload/files/mipodigobulevotugudoga.pdfIn PDF document text
    • http://satcomlink.com/userData/board/file/74269281976.pdfIn PDF document text
    • https://bankubezpieczen.pl/userfiles/file/62350946578.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/75071309158.pdfIn PDF document text
    • http://sunriverps.com/data/editor/file/85943655835.pdfIn PDF document text
    • http://bk-plus.at/userfiles/files/gifexevewepuwisikute.pdfIn PDF document text
    • http://thegioimaychaybo.com/app/webroot/uploads/files/telodulegalomos.pdfIn PDF document text
    • http://korytnica.net/data/files/gizejewelejopamapevo.pdfIn PDF document text
    • http://madinagirls.com/easydo%20v2.00/files/uploads/rewolugonuk.pdfIn PDF document text
    • http://landonintergroup.com/ckfinder/userfiles/files/zokajesezig.pdfIn PDF document text
    • https://atiksigorta.com/files/87065558208.pdfIn PDF document text
    • http://pibar.tw/uploads/files/202109011100112630.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613280bf8ff85---78261860379.pdfIn PDF document text
    • http://cravaluos.com/ckfinder/userfiles/files/9388696750.pdfIn PDF document text
    • http://clinivetmadonnadirosa.eu/userfiles/files/49798933724.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f52c28ddf2---1029172607.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161350b072a255---91565349213.pdfIn PDF document text
    • http://holmeslawfirm-iowa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zemakijijosiraker.pdfIn PDF document text
    • https://dom4m.com/userfiles/files/sigawafilibebefotufut.pdfIn PDF document text
    • https://magyar-logyogyasz.hu/fileok/file/39840869759.pdfIn PDF document text
    • http://hoadondientu-ptp.vn/images/ckeditor/files/gugurasudune.pdfIn PDF document text
    • https://hashtag.school/userfiles/file/jalonekikogokiwudolow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=how+to+block+social+media+sites+on+chromePDF 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_off0000da4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA4A 10944 bytes
SHA-256: d3677648a16dda23d92dc4e43357252ac9b5689e2283e1ac414d82e4de744c0a
font_01_sfnt_off0000f37c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF37C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B8E 17460 bytes
SHA-256: 17a68c8705c1bb356e755b68bb49b7eea2ce75dccbe9a10ad4541b7063b16a34

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