Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd28b3ef254cb711…

MALICIOUS

PDF

81.1 KB Created: 2021-09-21 03:16:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d0df0c9b30c96801eaa36e9dfdf43646 SHA-1: f53273e06c60891840fdee7188c1b93ab7f1f009 SHA-256: dd28b3ef254cb7119d404d8ea9d662acb02a69a6c40e35fc3ce575866220e5c8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. Additionally, the document features a link farm pointing to multiple compromised websites, suggesting an attempt to redirect users to malicious or phishing pages. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://fenicia.uy/fenicia.com.uy/uploads/files/kotabagizi.pdf In PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/lokejunaxule.pdfIn PDF document text
    • https://htijsr.com/userfiles/file/kodevegumasadivir.pdfIn PDF document text
    • http://distant-property.ru/fck_editor_files/files/tozovusavuvipifewirutib.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/padotumuxipepe.pdfIn PDF document text
    • https://www.pirkitpadangas.lt/ckfinder/userfiles/files/mokel.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/kp3fgus0ddprpe994ldrddokv1/dilek.pdfIn PDF document text
    • http://fusiongrup.ro/userfiles/file/sujezazabosufubofozewupul.pdfIn PDF document text
    • http://tanphatinst.com/vietkiendo/upload/file/lijurapubanulajiwazudom.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/vhifnv8tguu600t8akut1m0do1/36529036311.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/tonudiwofom.pdfIn PDF document text
    • https://shian-jin.com/UserFiles/files/gagiwixuledezevanud.pdfIn PDF document text
    • https://zohopin.com/calisma2/files/uploads/vonoxijowupevo.pdfIn PDF document text
    • https://braindevelopmentmaps.org/userfiles/files/nozezovejiriwedu.pdfIn PDF document text
    • https://lifo-sea.com/ckfinder/userfiles/files/31879107173.pdfIn PDF document text
    • http://grandrosso.com/js/upload/files/41239573209.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139dbad8ee4e---76093518685.pdfIn PDF document text
    • http://werder-ritter.de/UserFiles/File/fakosejadevone.pdfIn PDF document text
    • https://coopinproject.eu/ckfinder/userfiles/files/betoje.pdfIn PDF document text
    • https://turbooto.vn/upload/files/ruzufinufutojisizumitud.pdfIn PDF document text
    • http://tostonet.cl/ckfinder/userfiles/files/badelunisaki.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/zulodunez.pdfIn PDF document text
    • https://www.mediawerf.nl/bundles/store24backoffice/ckfinder/userfiles/files/tabixonufu.pdfIn PDF document text
    • http://2016.letnifestiwal.pl/ckfinder/userfiles/files/1586938863.pdfIn PDF document text
    • https://nergizleryapi.com/image/files/gezaxowaruworuluvugosudoz.pdfIn PDF document text
    • http://vegman-kzn.com/ckfinder/userfiles/files/8942287454.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=ml+boas+mathematical+methods+in+the+physical+sciencesPDF 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_off0000d4bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4BB 10928 bytes
SHA-256: 1343c1f789ff4a9f79ee16b7379720e56fdcf8c954644ac0384275e5ad004316
font_01_sfnt_off0000edac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAC 18052 bytes
SHA-256: bc14103e693891c1e8bb1917db48ed9244de43888c983301c89b9cf98d467b8a
font_02_sfnt_off00011c9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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