Malicious PDF — malware analysis report

Static analysis result for SHA-256 37b3434bab8e7a50…

MALICIOUS

PDF

86.1 KB Created: 2021-06-25 14:23:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 440c95c523f40e14f004e602ded8e96d SHA-1: 321b56585986f5138e4e8b1400a869db719d3a79 SHA-256: 37b3434bab8e7a506e5b09274851fe9139a5e428402a1cf12ba9b33ec87aee38
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous links pointing to compromised WordPress uploads and disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish for information. The embedded URLs and link farm structure indicate an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://drafthe.ru/uplcv?utm_term=simulink+examples+for+beginners
    • http://daindnc.com/fckeditor/userfiles/file/67542972024.pdf
    • https://ngoctraithaibinhduong.com/uploads/news_file/95833423365.pdf
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/9gljh4vcqgnn1mi3qqs0ckkre7/98761785981.pdf
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b57735994d5---57611329776.pdf
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f6b46e9c5---sozusuripodokonibujixuka.pdf
    • https://sieuviet.net/webroot/img/files/nesavorefutoji.pdf
    • https://robert-zauer.cz/userfiles/file/11828597128.pdf
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16087600e1e122---voxami.pdf
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c9754bcc74e---20461808868.pdf
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/mbj5dog31p9df05mb7so20e6t6/tebabajunawimaworu.pdf
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/c97b52f688161ab2614e91b065acb11c/94683779813.pdf
    • https://bmw-zona.ru/uploads/file/tezogef.pdf
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abf87bd23a1---soteruvipenisorute.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee756ea7c7---29805435333.pdf
    • https://thefertilizergranulator.com/d/files/nonovezutafajafatigime.pdf
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16086d80337858---rowukuzuradew.pdf
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee45.bin
1debc763c85980b8ee2cac181ce61e3aa53dff6e34dc016e602bf4292c6bd4de		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE45 16900 bytes
font_01_sfnt_off000119f7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x119F7 16792 bytes
font_02_sfnt_off0001320e.bin
b3913fba887c60d0dfb97e72987f3c3bb7e5cf735f46f1f81634d94e832b69e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1320E 11112 bytes

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