Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b85756d115114d7…

MALICIOUS

PDF

72.3 KB Created: 2021-09-21 20:52:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 17bbe34accd76b36f210dd2861c6bb57 SHA-1: ed1ea9f1252330244498c8f1aab7f4319ee3f4b3 SHA-256: 2b85756d115114d79f9910d75d70362cb270f872db096379303d3c8a2334697c
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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://oniceh.ru/uplcv?utm_term=hack+of+coc+download PDF link annotation
    • http://jinruily.com/UploadFile/file/20210917115133953.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/161338e7667a74---51334270635.pdfIn PDF document text
    • https://pt-lb1.pasarantogel.com/contents/files/kirun.pdfIn PDF document text
    • http://elpijisystem.com/file/11272940233.pdfIn PDF document text
    • http://saint-party.com/media/file/senonokej.pdfIn PDF document text
    • http://strojsteel.cz/webpagebuilder/ckfinder/userfiles/files/39401142431.pdfIn PDF document text
    • http://soundspace.eu/Upload/file/kixenexok.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132387cbc116---29330347404.pdfIn PDF document text
    • http://solmoda.it/userfiles/files/24729673530.pdfIn PDF document text
    • https://taxforce.nl/userfiles/files/napusafijosuwovez.pdfIn PDF document text
    • https://dveropolis.ru/upload_picture/44553722233.pdfIn PDF document text
    • http://eminenceinc.com/userfiles/file/foliz.pdfIn PDF document text
    • https://ncltandatbar.com/home/ncltandat/public_html/dowalumniusa/ckfinder/userfiles/files/23433717656.pdfIn PDF document text
    • http://olympicthesportshop.in/uploads/26190594115.pdfIn PDF document text
    • https://raljob.com/userfiles/file/dekazosizovogiw.pdfIn PDF document text
    • http://didula.ru/img/file/9212611461.pdfIn PDF document text
    • https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/53304774675.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161433aae9b074---miroserewew.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/64b59cfa0135cdb6341774bccaf4a004/buzigugimuxitajupozugama.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613647be69a0a---15900602382.pdfIn PDF document text
    • http://turhantur.com/turhantur/files/nazedozixixirux.pdfIn PDF document text
    • http://sicilalluminio.it/userfiles/files/23605848720.pdfIn PDF document text
    • http://mgtofubbq.com/uploads/files/todozudepekokugoso.pdfIn PDF document text
    • http://www.farmaciapenil.es/userfiles/files/32044742681.pdfIn PDF document text
    • http://mazraeir.com/images/upload/files/jopezurupenikowapi.pdfIn PDF document text
    • http://budohurtsa.pl/userfiles/file/57681861589.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_off0000bcba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCBA 10048 bytes
SHA-256: a3d1c65821c5667dfab7a621c59e4db802d883a6932585b537f38dbbb7f0252e
font_01_sfnt_off0000d338.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD338 15740 bytes
SHA-256: 80f52755cecf0a26e36e0d0e9957f8772468b401c497e1848cd081957e7e0c31
font_02_sfnt_off0000fb30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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