Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d8b54ea06301118…

MALICIOUS

PDF

83.2 KB Created: 2021-06-23 00:19:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1a0f2a60038e4d99088992d9af540295 SHA-1: ce144abc5f4010153361c11a46c8a57e52715656 SHA-256: 9d8b54ea06301118b1f145d98a22ba9fbd60553d8ed3c5b0ddf94e195420b6a5
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous external URLs, many of which are hosted on compromised CMS upload storage or disposable domains. The embedded content, though heavily obfuscated, suggests it is designed to manipulate search engine results or lead users to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/47564067245.pdf
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607d183f655ae---96007542685.pdf
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a53feb07e4c---5059626478.pdf
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/cff33808e8a3a83ac07e7873ddf6d659/8990992823.pdf
    • http://wamer.org/userfiles/file/3139575570.pdf
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/04e9f6121e7c869fcf9c9ce390cda0b9/jufigejiboxakifunewexumik.pdf
    • http://jyotiacademicpress.org/uploads/file/11173491597.pdf
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d159111a20---vesimaw.pdf
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16077427d6add6---14729022406.pdf
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160af0c5562dca---43837573660.pdf
    • https://semineebrasov.ro/printuri-fi/files/70532105382.pdf
    • https://artbynela.com/uploads/file/43062239517.pdf
    • http://szao-spb.ru/images/news/file/59035649033.pdf
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/e32b4ffa01c63c63b7b644e2caf67951/41990163983.pdf
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/jjub8q6rouuq0unf5cfommevl7/35963628224.pdf
    • https://tvsporedi.si/vsebina/60232303658.pdf
    • https://topplene.com/upload/ckfinder_temp/files/20210609034204.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=answers+for+logo+quiz+ultimate
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000107ba.bin
81a0e756700bca098edf30fde127c2c7a0a8b2c3bd06bc7cd392f49a07da464e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107BA 5344 bytes
font_01_sfnt_off000119ea.bin
bab8158c282c977612ef5a12ddff5a8afbd31e6b8876ce6bb65f0ea6c0e9019b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x119EA 11012 bytes

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