Malicious PDF — malware analysis report

Static analysis result for SHA-256 763c24a4d5677c40…

MALICIOUS

PDF

88.8 KB Created: 2021-07-15 14:01:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4202f9c844278e7eef3f4f0b51d19cde SHA-1: 3b9b81800cecbc8642275e269ed51bf785d44c8d SHA-256: 763c24a4d5677c405271c843dcb086428f5b3ff98d4a01d45750e8100f7dcc0f
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farm heuristics, indicating it is designed to redirect users to potentially malicious websites. ClamAV detection and ML classification strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple compromised CMS upload links further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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=religious+delusions+definition PDF link annotation
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee4bd63945---82505514459.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/25403810967.pdfIn PDF document text
    • http://vandervalk.reviews/app/webroot/files/userfiles/files/gotafomaruxenogoxuno.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/ccb7e0c63f921196019b2aee503de9a0/neguloxajiwiku.pdfIn PDF document text
    • http://trendymamy.pl/userfiles/file/tenexelonukisol.pdfIn PDF document text
    • http://capthepcongtrinh.com/uploads/news/files/rugudevijitinelefalamag.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc8bfe0730---33689471232.pdfIn PDF document text
    • https://www.makathastaliklari.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607264621bb25---boranubobezifiwo.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/6925c692b9531707a2d62f4114bd0680/nixivilof.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c13f967f0e7---jukatizuvilakonubokapiwed.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/d6ccu86s02g6fit94i7r2626e6/26319095853.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/d2fef71dc94fec1d46f0e65ce09972b3/fuvudupixiv.pdfIn PDF document text
    • http://elyriahigh1974.org/clients/0/05/052ab20d644b737728595af1a47b4450/File/vogike.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/hjc2lh7cv23lbbcv97o2dtdv0s/wotasuxe.pdfIn PDF document text
    • http://trans-serwis.com/userfiles/file/kosusixu.pdfIn PDF document text
    • https://heyratacademy.ir/file/486096322.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/20309f9aaddc16888fbdc5953a492e69/tixojonuw.pdfIn PDF document text
    • https://coonvalleycc.com/userfiles/file/66593363719.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/pj0mbo7dp98k647ft65cf4l4c7/zowonugiv.pdfIn PDF document text
    • https://banghenails.com/upload/file/wawabufiwenuke.pdfIn PDF document text
    • http://chatfieldfarms101.com/userimages/nobamoribupaluj.pdfIn PDF document text
    • http://wuxihemei.com/ckfinder/userfiles/files/20210622_212948.pdfIn PDF document text
    • https://burlingame.com/wysiwygfiles/file/laferukipo.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_off0000f842.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF842 10412 bytes
SHA-256: 69dcccf3eb362b899d9f09a78e2c53d9f8f9dd78c247c3bc4a1a8a89b65d81c3
font_01_sfnt_off00010fc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127D7 17720 bytes
SHA-256: 4360ba52fc89781ec4b5878b71b02c980f6f8d6cec206a692c8493f9c015f420

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