Malicious PDF — malware analysis report

Static analysis result for SHA-256 5517a36cbac5efdb…

MALICIOUS

PDF

87.2 KB Created: 2021-07-01 09:29:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: fdd0a25f9d2a7139debb5e1361940db4 SHA-1: c3f35e3bc8b3d669540391e051eadea6be7976b8 SHA-256: 5517a36cbac5efdb233bf2fc6e14fc70561bfd2c026e8e2f14017cf4d00b09c8
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised CMS platforms or appear to be disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, but the presence of a link farm is a clear indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16084500ca9658---17567790639.pdf In PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/f6bfedf7c2c19f0d737e985e00e7cbd8/sagaxitun.pdfIn PDF document text
    • http://gsprojekt.eu/userfiles/files/nolizufanokabof.pdfIn PDF document text
    • http://eraucheta.ru/uploads/file/6211798565.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ac93434436d---6663160579.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7911cff98---976936202.pdfIn PDF document text
    • http://dichvu12h.net/userfiles/file/14237068284.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a7924c5c5---wanamawezuketib.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983bcf0f63f---verubepojakuzizokupu.pdfIn PDF document text
    • http://asset-books.com/userfiles/file/midug.pdfIn PDF document text
    • http://studiobaliva.eu/userfiles/files/vixesubejonik.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/rawamilo.pdfIn PDF document text
    • https://otartufo.com/ckfinder/tartufofiles/files/mubodilowu.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/61396633321.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/2t5tnisj01erd4u5uaatbgede1/wilevude.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/0vfnvq6upgerkb9qaj9gblali5/jowazepin.pdfIn PDF document text
    • http://siembra.me/uploads/files/zupudaj.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160d3ab2e3900e---61992358564.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/sagam.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/eeb6ca0c61946f8a430b5e2d8e8a439f/lamavufebilifimeko.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160978689ced91---1999309480.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/68002116941.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/eqtdb0qmo5ufc8b8k51plpf2d3/17137727405.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=experiencing+double+visionPDF 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_off0000f2d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010ae6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE6 16968 bytes
SHA-256: 361b9e6b1641c07a48ad8c79e6df9e35675020d3973cab4ad891f7db80afe301
font_02_sfnt_off0001373b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1373B 10820 bytes
SHA-256: 0800554270c36b750191631e0980ff50c31b525fb0162ea6dfb70a56608aa024

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