Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4c95d9356a923b0…

MALICIOUS

PDF

76.6 KB Created: 2021-09-07 03:04:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 697715d63a855d8bb08bd1e75e3c6009 SHA-1: 40f53047ea883ba4d800270c3719f89a21c57afb SHA-256: b4c95d9356a923b0b5213248c5be10017ad9bc7915c1fad48d8e6e0e5aedf411
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious. It contains numerous links pointing to potentially compromised websites and disposable hosting, suggesting a link farm or phishing lure. The presence of external URIs and link farms indicates an attempt to redirect the user to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://synerhu.ru/uplcv?utm_term=iconografia+definicion+pdf PDF link annotation
    • http://designbeginnings.com/upload/file/wumewazewonuvejupimuxut.pdfIn PDF document text
    • http://gulfcoolcontracting.com/uploads/userfiles/file/file/nuzazetetimurogul.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/36321519138.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/19567132606.pdfIn PDF document text
    • http://avvolodin.ru/upload/file/kisadurejobi.pdfIn PDF document text
    • http://dagmar-e.de/userfiles/file/gafupufoterixaxenut.pdfIn PDF document text
    • https://polresseluma.com/assets/ckfinder/core/connector/php/uploads/files/57118513826.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/81574942181.pdfIn PDF document text
    • https://www.axelendinggroup.com/wp-content/plugins/super-forms/uploads/php/files/17bcbfeb7cc13160a66ba060fc8204dc/rominodi.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/c44u2u8ro5g1ulk5g2t300b3hv/35237001543.pdfIn PDF document text
    • http://celcg.pl/uploaded/file/79090670847.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/9da83695f5a2a896c4245b5db3508ab8/72560236846.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8897dab7b7---bonorojideponajonon.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/d78bd52c10ac5268532903e31fc68ff1/gakufuniwo.pdfIn PDF document text
    • https://konyaalotaksi.com/userfiles/file/lilubenazujodumumu.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7793e042b8---87869169828.pdfIn PDF document text
    • http://cjmfgx.morefriendship.com/upload/files/47795651048.pdfIn PDF document text
    • http://b-solutions.net/userfiles/file/17347973866.pdfIn PDF document text
    • http://kiuruvedenlukio.fi/tiedostot/file/sesubotopowivutotoki.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/43757497685.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16090c774a8a2a---17070469755.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/091f2b793d810d1975fca78ff4262f7c/zufot.pdfIn PDF document text
    • http://houselandia.ru/files/lipog.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_off0000c2f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2F2 19412 bytes
SHA-256: a38e696a7d08042f02de58d5b6968aa2397f32505ab6ae029696d81862696a50
font_01_sfnt_off0000f3d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D4 10436 bytes
SHA-256: 9500b1a3c82b46bb54b0661f155981548b73b05d365b2e16dfb9610392e4c1a9
font_02_sfnt_off00010b60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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