Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5744fca6c869827…

MALICIOUS

PDF

89.7 KB Created: 2021-06-27 11:48:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d86aba2f35e95a24812a0224eef2c2c0 SHA-1: 8ba9d8b54299828b2fcca1e1784a1b54916b959d SHA-256: b5744fca6c869827426c291f1adb9c13fae8a903184a2e7a7d38788162d4b61a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. Multiple heuristics indicate the PDF contains numerous links, many pointing to potentially compromised WordPress sites, designed to redirect users to external content. The embedded URLs and the nature of the heuristics suggest the primary goal is to direct users to malicious or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/6vvhs7m4a7u9qogc8as17qsbmv/76154103319.pdf
    • http://portalcom-b2b.es/img/user///file/_0879325001619779666.pdf
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1606e358869e01---279103820.pdf
    • https://aartipalette.com/userfiles/file/linowakiv.pdf
    • http://ketnoikienthuc.com/upload/files/66094345105.pdf
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16072408891009---befibabazo.pdf
    • http://moto-bike.pl/userfiles/file/wexepabar.pdf
    • https://bustotoronto.com/userfiles/file/10199519155.pdf
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160740b3c41895---87615606577.pdf
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c248816023---89467746438.pdf
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/uva393kerib30d1q0trbcrr1l5/lovizevu.pdf
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/od05b5ucpr0f38kf774vjd84gh/82537665531.pdf
    • http://prociweb.hu/sites/files/file/98179468947.pdf
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/a403a19ae424ba2b01255b92870e9416/77585996913.pdf
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085d20d77340---kolataniladozuladipujuk.pdf
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d4c52a85331---lerobosoduvafomowobelak.pdf
    • https://aedwea.com/upload/foto/biropogidanegaxi.pdf
    • http://sistersaviopublicschool.com/userfiles/file/wipipapuj.pdf
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608752f26a23f---89898612875.pdf
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/oc43mj6uqmqkjuohmlidr2u002/bukoxesazivonibiripogoki.pdf
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/7a600fa50cf73666229dfaf24da60640/68923673319.pdf
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/1961920d1fb8f038ac2e2efd22d7c288/fatiwujakalup.pdf
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7e0234864---70085774753.pdf
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b38568ba9a1---71001236664.pdf
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab6b0771452---bifebowezutinagekem.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=iroquois+tomahawk+for+sale
    • 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_off0000fbd9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD9 16792 bytes
font_01_sfnt_off000113eb.bin
ddc5b160cbf62d08ea77d8f1ba4ea0f873aef91ef9a39137d03e1c053c30605b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x113EB 16644 bytes
font_02_sfnt_off00013f1c.bin
9a084155d110030404604b0e69e3a81e38c84ea512e528401f2eb2bcc66a92c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13F1C 10752 bytes

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