Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef46949020a78dba…

MALICIOUS

PDF

81.0 KB Created: 2021-09-06 16:10:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d4cbe7d96b5e22ce9609c380af6f95ad SHA-1: 25cb8da15e2be31eea8a57c41ef004ff2d4f5d58 SHA-256: ef46949020a78dba595e63b21fa7e84dd3d1eef32b098f8845658736eba73cd7
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to various domains, many of which are identified as compromised CMS uploads or hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery through these links. No scripts were extracted, and the document body was unreadable, but the link farm structure is a clear indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://erictex.com/ufiles/files/zajulif.pdf In PDF document text
    • http://altinay-law.com/images/file/95260453646.pdfIn PDF document text
    • http://caydinhlang.net/userfiles/image/file/kuxobikinofa.pdfIn PDF document text
    • https://dnsbp.com/all4help/fckuserfiles/file/vuvog.pdfIn PDF document text
    • http://growlink.biz/userfiles/file/61738268667.pdfIn PDF document text
    • http://sin-hua.org/userfiles/71312895648.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/kirabowufewodekipanobat.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/58024321654.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/fbcvju9uadhlchqdkuf1gl938u/bulafitorumegatage.pdfIn PDF document text
    • http://gchsclassof1970reunion.com/clients/6/6a/6a45fbe13d63dbb0eb8070d7cb9dbc89/File/kujasepezajurir.pdfIn PDF document text
    • http://csc0532.com/userfiles/file/20210622225314_gb90le.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609661fa8e0b7---30390012783.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16113adbe7aa91---dowefabonitag.pdfIn PDF document text
    • http://kielcenoca.pl/files/file/garepetizoreken.pdfIn PDF document text
    • http://deborahkay.com/ckfinder/userfiles/files/11400282080.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/sr1mfrgf9gqujh0kgl4g85j71g/99664875479.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094789cd82c6---mukesabugi.pdfIn PDF document text
    • http://controlsystemco.com/cache/fck_files/file/wojabadezemiw.pdfIn PDF document text
    • http://ramsteinroyals.com/clients/e/e6/e68fa2bc61b75b8a06766e25905052c7/File/gosemezivajatizugob.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b8d90c7a3b6---1329525775.pdfIn PDF document text
    • http://fanti-fitness.pl/uploads/assets/file/58743771997.pdfIn PDF document text
    • http://muzycznescyzoryki.pl/userfiles/file/1608716797.pdfIn PDF document text
    • http://www.pes.edu.mn/ckfinder/userfiles/files/38522950160.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1610dbba200b6d---56095342171.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=convert+multiple+png+to+pdf+imagemagickPDF 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_off0000d353.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD353 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB65 18684 bytes
SHA-256: d012ecb7bdd783452671a0e75d6ad53ae0c3474c7242e3926c1fd025f9d768f8
font_02_sfnt_off00011c2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C2A 11084 bytes
SHA-256: 22f6111f2e090a9acd2c1852a390df6f0111691a96a61707309053743da38314

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