Malicious PDF — malware analysis report

Static analysis result for SHA-256 15d538ac59a57205…

MALICIOUS

PDF

88.9 KB Created: 2021-07-31 05:35:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ce5008d078c553bc305844595151f409 SHA-1: 9162c9d274d2b20f4e669006f9a5276ea732749e SHA-256: 15d538ac59a572050ea298e4e1deb2b1c44cdcbc17c20e152d9aaa6696628d83
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it uses social engineering lures, such as a fake browser extension installation prompt and a potential MFA harvesting pretext. The document body is heavily obfuscated, but the presence of embedded URLs and link farms, some pointing to compromised CMS uploads, suggests an attempt to redirect the user to malicious sites for payload delivery or credential theft.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://morethancars.eu/uploads/edytor/file/67074496374.pdf In PDF document text
    • http://dienlanhlongan.com/upload/files/zutikiruxuripazemivupika.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/banubonifolixipebino.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609a80823a697---8223924569.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/93ts4cafa4so2vlk7ugv6kf0ah/buzap.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f21b44b022a---gomigujidimaredeb.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160ff6b80c1f8a---woponiradamatuxan.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d391686ce---55719388666.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160778fae80366---xokexokasifakalav.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/5060fd9d97ca0333daf70acd8e90ec5b/5922366026.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/dujamaguguvisewafumex.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089a529d3109---xopudu.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609d09caec2a6---fanekexelaralekaseveze.pdfIn PDF document text
    • http://americasbestwingsbeltsville.com/uploads/files/wusunidasufifaseb.pdfIn PDF document text
    • http://bucketdiaries.com/uploads/files/pajinutonupusaxakolonaran.pdfIn PDF document text
    • https://coastalholidayproperty.com/ckfinder/userfiles/files/83089120614.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/254eofb7cb7eue5n37j9m4lr7v/41807057530.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606da6f1aa569---jikowo.pdfIn PDF document text
    • http://vietthanhstone.com/images/news/file/zubebenowobilamokawi.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c11ab96cd23---jelosibijavagib.pdfIn PDF document text
    • http://teifsepahan.com/files/file/bokiposolafuxeveduto.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/be76d7d2860d3d2f4944c1748de6afbb/goxufobupolulowofi.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/9608ebc4c4382ee04c536a4e79fffa14/rarojuvolokunepazenirekix.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/kovazevo.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/44ea6d7a453fdca2ddbeb33746f50bf3/sivonu.pdfIn PDF document text
    • http://abogadosaguilar.com/ckfinder/userfiles/files/32663340372.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=avast+internet+security+keyPDF 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_off0000fba8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA8 16392 bytes
SHA-256: 19b95e44d14048993dcc4195d556033878af136ab1fc8b108a8080aff27d4e37
font_01_sfnt_off0001260b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1260B 10408 bytes
SHA-256: abdb0f9bc2734625f5feb5cb30fd316fb72bb09e97e92fd1695305c243346a8e
font_02_sfnt_off00013dd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DD9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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