Malicious PDF — malware analysis report

Static analysis result for SHA-256 27f92fb2af26155f…

MALICIOUS

PDF

66.5 KB Created: 2021-05-27 06:48:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8a63004c7042e0bb71ff5240f3949e50 SHA-1: 0b92c50f6fec1ef995d3e7a4471e102a9445b7e2 SHA-256: 27f92fb2af26155f119f29ce623f2aadc11970a7bc473249bc95c5ae8c0fd59d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm hosted on compromised WordPress sites, suggesting it's part of a phishing campaign. The document body, though heavily obfuscated, appears to reference 'infinite ammo in gta 5', a common lure for gaming-related scams. The presence of external URIs and link farms indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 https://allytemp.ru/uplcv?utm_term=how+to+get+infinite+ammo+in+gta+5
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608714dfaa835---26748844455.pdf
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/i9fk8vopks3r9fdj51hftdb701/balilujinajoxizorukewine.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093c9db4d20c.pdf
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/mhtigm90g4uq3tmtmbljnlt1dv/14263905401.pdf
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608746722bc92---zekukara.pdf
    • https://praward.tw/wp-content/plugins/super-forms/uploads/php/files/e39d785b2a3084804f8248295c53e02b/92964624024.pdf
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160935b808e88d---20045395673.pdf
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b19abd95b7---jizajozozolelubafixiw.pdf
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a85511d116f---82832504300.pdf
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/fcdc9aef9537ed4e3d40bd04ab772f62/50697070570.pdf
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ac87c664c2d---jifomi.pdf
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e03f0ef61e---50828459543.pdf
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16097be235d0ed---falusonurosowamiwozuw.pdf
    • https://anmimar.com/royal/userfiles/file/16354189992.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc44.bin
531f4f4ffc42c958fffb71c3d1f175c181a3bbd663c5677944944fe51d82d37a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC44 4960 bytes
font_01_sfnt_off0000dd3a.bin
5d766d5f17042fd55dd1cbffaf20369b1a75ddebb3793a48aa99cd459fc01c0e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD3A 10684 bytes

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