Malicious PDF — malware analysis report

Static analysis result for SHA-256 5249d46bca928bac…

MALICIOUS

PDF

77.0 KB Created: 2021-10-06 02:13:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: cbde10e761b3f74c6c09735eb4a1a62e SHA-1: 134481e6208860a23516b630e7c37d710ccc2ca5 SHA-256: 5249d46bca928bacb713de7da1c2ff189d1f337bab6dffed413f805b6e7f085a
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to obscure the final destination. The primary purpose appears to be redirecting users to external sites, likely for phishing or to download further malicious content.

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://korovin.org/site/img_ufiles/repewaloxelado.pdf In PDF document text
    • https://newoptic.sas-global.mn/uploads/files/vivagagelujaku.pdfIn PDF document text
    • http://fullerton.kopanramen.com/uploads/files/suteboxukipajugowetutezi.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/gekapujinikamuposulasar.pdfIn PDF document text
    • http://rjt1.org/upload/files/nimuxiwanivemeg.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16156e7ee0a70b---88116462811.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/9ll0jbvttvofu91vl494gchr4j/mizakutelaz.pdfIn PDF document text
    • https://loyalangkorapartment.com/userfiles/file/gijofuxogoxubalivabo.pdfIn PDF document text
    • http://ecilingirler.com/resimler/files/20839150110.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/ecb4b4d191377dc5caa62c7a44488f04/tozik.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/89018017492.pdfIn PDF document text
    • http://bharatdarshan.net/rgroup/ckfinder/userfiles/files/fosaxewudexuxasopinizede.pdfIn PDF document text
    • https://sassanoproperties.com/FCKeditor/file/vugemetudomidivu.pdfIn PDF document text
    • http://pantanalmsnews.com.br/ckfinder/userfiles/files/74815078247.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/54961571411.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/93190370406.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613be155206c1---26569907521.pdfIn PDF document text
    • http://istihdamhaberleri.com/upload/ckfinder/files/78152060739.pdfIn PDF document text
    • https://chungcungoaigiao.vnpec.xyz/uploads/files/javiloxarat.pdfIn PDF document text
    • https://aordonez.com/images/contenidos/files/diripuniwixivujezaxo.pdfIn PDF document text
    • http://flex-link.cn/uploadfiles/files/31396555303.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/fakebolasobi.pdfIn PDF document text
    • http://ghinelliarchitettura.it/userfiles/files/64708669109.pdfIn PDF document text
    • http://sweed-trans.eu/ckfinder/userfiles/files/13093808140.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=describe+the+differences+between+the+processes+of+transcription+and+translationPDF 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_off0000c80e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC80E 17240 bytes
SHA-256: caaba6fb42f5dd958a9ce60fb6db4b70f1baba36dd6e0fddce4568aba7c1d201
font_01_sfnt_off0000f46d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF46D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C84 10944 bytes
SHA-256: 2a7cae412717a8ddf7c47adc229681cb41dc0f48b40031a4f48d8c3d4f901df9

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