Malicious PDF — malware analysis report

Static analysis result for SHA-256 14dda13db4c760fc…

MALICIOUS

PDF

72.4 KB Created: 2021-09-06 10:02:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b34a8d0ad2efaf207e3c5879fabd864d SHA-1: 5f262294bd1241bd0de4c3f2351afcd9bdb671ff SHA-256: 14dda13db4c760fca2cade71d3c8cf61697d4b2f48453b5ef93540a4b846684d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document that contains numerous embedded URLs, many of which point to compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of external URI links suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://laborke.ru/uplcv?utm_term=aerobic+plate+count+pdf PDF link annotation
    • https://www.explosivo.gr/wp-content/plugins/super-forms/uploads/php/files/06d8c0c4da90b2489b62f9cce6375eba/39434441709.pdfIn PDF document text
    • https://sunsoftinfoway.net/ckfinder/userfiles/files/52376624966.pdfIn PDF document text
    • https://euroroma-bg.org/files/file/39722132862.pdfIn PDF document text
    • https://casabresciani.it/uploads/file/zuvipofirepatizog.pdfIn PDF document text
    • http://ehhs1969.com/clients/6/67/67a0fa02f482ea8575b7cec7429e43a8/File/diraxejojonodiwega.pdfIn PDF document text
    • https://veterinarycarefoundation.org/userfiles/file/4530528870.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16090af176f224---gaxagavifebibakorefabeveg.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/kevunixozegudukadegorol.pdfIn PDF document text
    • http://fioredda.com/userfiles/files/42462855872.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4cd55e0e2---dojuzurowosow.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/poniroxal.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/43489562652.pdfIn PDF document text
    • http://www.psoevalledeabdalajis.es/ckfinder/userfiles/files/vidajugusutuz.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/456d1ab11387acb835750fd67d7e4894/papej.pdfIn PDF document text
    • http://handinks.com/ckfinder/images_store/files/fovododadegelojugap.pdfIn PDF document text
    • http://prime42.ru/userfiles/files/98897437053.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/eumo12pvc5brs5fvtnf0lq5a6j/rafodokudodubixalulaj.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/38176658592.pdfIn PDF document text
    • http://eurogeographyjournal.eu/admin/fckfiles/file/73664633797.pdfIn PDF document text
    • https://www.ftha.org/admin/ckfinder/userfiles/files/zijiluloxaxos.pdfIn PDF document text
    • http://studiotecnicobonoli.com/userfiles/files/bawamesupizudakaposalako.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/187830c7045448ddd223f3d91a1f8c20/xafimadigepurude.pdfIn PDF document text
    • http://tuderprogettazione.it/userfiles/files/60838018696.pdfIn PDF document text
    • https://lapdonline.org/file/89543120190.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_off0000bbc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBC9 10664 bytes
SHA-256: 101b60a00d05451b50c06dd32d7fef291303c19f9e446ad97a9a55d2305f583e
font_01_sfnt_off0000d419.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD419 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC2B 15576 bytes
SHA-256: 6738fd0faae1299b806c18c5c472070619c0aa3223e62ab5cacf015f0fb2b59b

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