Malicious PDF — malware analysis report

Static analysis result for SHA-256 a44d64a52a3c521e…

MALICIOUS

PDF

71.0 KB Created: 2021-06-29 04:07:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7b471749dc9d8e2f9b25259ea15871da SHA-1: d299d13a7307097e9d169039bb4c51dbb51e439e SHA-256: a44d64a52a3c521e351bf155dab6d74f9dc18f791f95f5ef949e3fd1dd06eb12
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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 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://hemeringen.de/ckeditor_ablage/userfiles/files/74658309952.pdf In PDF document text
    • http://hermangroupcorp.com/clients/3/38/389628ddbd62db2fa1e4299ecdfc1861/File/sasabimulo.pdfIn PDF document text
    • http://africa-emergence2019.com/userfiles/file/98652224738.pdfIn PDF document text
    • https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0766327acaae836504236476384bcd3a/xinovawagirorodig.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/ep2h2ttjecea2hlbvmf7q7umpn/54702062900.pdfIn PDF document text
    • http://indago-rovigo.it/userfiles/files/komewalomu.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eed5a5b595---94241342933.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/telekubaze.pdfIn PDF document text
    • https://retta-bg.com/userfiles/zunejikamunow.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/24104825272.pdfIn PDF document text
    • http://quinta.cl/upload/files/96958563668.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/3fd2a1bbc870e8d30ca3ebcfa787b816/nikopimetogarukunowaj.pdfIn PDF document text
    • http://heizler.hu/files/file/56529678094.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/f28f489f86fc0183b5afaee4ff9513de/vaweguvoxabemiletikop.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/pb76dgbq5ud2cbf3pcqv3ujr41/41990860267.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/3731bc67b69b9777537ce7a23c259f08/60216226199.pdfIn PDF document text
    • http://blueyee.com/upload/file/171345232403.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/dufir.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7899213d8---fadojomagerunabevavidov.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/45235547972.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/625fa395096f8dfa8ade72a5cc879b0e/sulinemetilirebejadelere.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/51091468156.pdfIn PDF document text
    • https://bluza-shop.ru/content/File/82669266295.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=job+worksheets+for+adults+pdfPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/158ed6841c2586bb95199e589cda3ac3/9375109562.pdfIn PDF document text
    • 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_off0000b6e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6E0 15160 bytes
SHA-256: 9e8ab728bdeefbf8fe3fa32ebb408569d82e190ea79d8baf3f4edb7909eeb194
font_01_sfnt_off0000ddc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f5e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E0 10808 bytes
SHA-256: 2487e67e95b409fbff6d8c6d9e6d156aeab0383dd7c114f3453d08b81f8435c8