Malicious PDF — malware analysis report

Static analysis result for SHA-256 c26fdb717f73c923…

MALICIOUS

PDF

104.4 KB Created: 2021-09-04 18:57:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e809694f91c734a72dbc70bd792640aa SHA-1: a94476f8eb1f56d5d3bd7dfe3f0e30f9bb337950 SHA-256: c26fdb717f73c9234f70421f3f742c524c40ba57567940d83a048c90215b457c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, pointing towards phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://almuhja.ps/ckfinder/userfiles/files/gemabadugefuzobojifukuku.pdf In PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/j34hnrkvi154tjup75pb6ham1u/mikesezovusazoki.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a4e03a2450e---lejelirogunubut.pdfIn PDF document text
    • http://saokienviet.com/uploads/image/files/lonuruxuzip.pdfIn PDF document text
    • http://natpuedu.in/userfiles/file/58292290840.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1610a7d316b187---67083566319.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/3952022249.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/7222227a1c85a5ecbe8b1ead58716d41/kufuzijidelifuwusilowur.pdfIn PDF document text
    • http://jingluo.net/uploadfiles/files/71220531484.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/uhrb5h2l25dg4mvdl9mgr9518h/46081731320.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a063931991---73687139748.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7d4918369b---guvizogisolunewi.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/703786560ecfece0304c227e2d203dd5/mifigunevewolabo.pdfIn PDF document text
    • http://humidorio.de/ckfinder/userfiles/files/bonixomi.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160bd1c06f0252---jizijivikorawuroxorajesip.pdfIn PDF document text
    • http://imi.vc/upload/files/xezanenagule.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/mujesutewegekunanonuj.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/51923409397.pdfIn PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210710190654.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/106799b10c584e310aa23858039ed917/54146299447.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb9c1d71df---37539348300.pdfIn PDF document text
    • https://promobryansk.ru/userfiles/files/wopomemubawanuxup.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/sadujopirovinebevoji.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/d7efed6e03f58cd0696d3f9b1267d18d/nepot.pdfIn PDF document text
    • http://londonjip.com/userData/board/file/rujadakarefefomijosamaxi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=adam+smith+economics+pdfPDF link annotation
    • 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_off000130e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130E4 19476 bytes
SHA-256: 2f63d440881df1f2e3dcac2863a89becf80f2ea5473916bc5b61952719462745
font_01_sfnt_off00016373.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16373 10720 bytes
SHA-256: 983a61ec4719bed5070fefe2d2ddbee10455cfa06fd387c46e309f0c8631b1e3
font_02_sfnt_off00017be5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17BE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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