Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e63955f0ab6387d…

MALICIOUS

PDF

76.9 KB Created: 2021-09-19 12:55:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 25ecb3096ca8358546a5116cd50f4e26 SHA-1: 03b4232a23d44baf26ed1cc6ca83c8900e70c8f3 SHA-256: 6e63955f0ab6387d049d04df95d46e70a4b9002dc0e111537e30f8c4c7c8fdc3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to redirect users. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classification strongly suggests malicious intent. The embedded URLs and the nature of the heuristics point towards a phishing or malware distribution campaign, likely initiated via spearphishing.

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://archism.ru/uplcv?utm_term=onenote+for+windows+8+free+download PDF link annotation
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/66563659aa09e7bc7c91ace86aca6ada/natajirosoramixazobegovu.pdfIn PDF document text
    • http://zvaracskaskola.eu/editor_uploads/system/files/tixonatidezi.pdfIn PDF document text
    • https://lotte-ppta.com/beta/assets/file/litade.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613228fb29ef4---kosorerof.pdfIn PDF document text
    • https://istanajp.com/contents/files/bugosatamobixepiru.pdfIn PDF document text
    • http://kaus21.com/userData/board/file/9023004477.pdfIn PDF document text
    • http://youngthisyear.com/ckfinder/userfiles/files/topinadetitawu.pdfIn PDF document text
    • http://casaperugia.fr/userfiles/file/47351478176.pdfIn PDF document text
    • http://chipublichouse.com/ckfinder/userfiles/files/61790845070.pdfIn PDF document text
    • http://legalinet.eu/userfiles/files/junikilesamobemubi.pdfIn PDF document text
    • https://marwaservicecenter.com/nbloom/fckuploads/file/polizujeri.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139ccdccf440---26258369556.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161406c0a5d033---2192149916.pdfIn PDF document text
    • http://oprandi.it/userfiles/files/kuxemefapawokirinezux.pdfIn PDF document text
    • http://ibshop.gr/uploads/_uploads/files/12793134620.pdfIn PDF document text
    • http://xaydunganphubacninh.com/webroot/img/files/17063775010.pdfIn PDF document text
    • https://erdenet.mn/userfiles/file/23467738450.pdfIn PDF document text
    • http://tuderprogettazione.it/userfiles/files/dowojoxived.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/fuzevobomina.pdfIn PDF document text
    • http://benedictinoselrosal.org/ckfinder/userfiles/files/32674486495.pdfIn PDF document text
    • http://cartopack.be/Images/file/ketufokinukemajevisemu.pdfIn PDF document text
    • http://giaydantuongphongkhach.net/images/news/file/tapefa.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146560ba9813---17321700925.pdfIn PDF document text
    • http://nergizleryapi.com/image/files/28970116384.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_off0000c9fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9FB 16940 bytes
SHA-256: 8e34c0eef1daaee9b2475b4bb6bc6b47a18f0257b03e0077268c8172c4178594
font_01_sfnt_off0000f51a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF51A 10668 bytes
SHA-256: 596b5924b46b4390a1b7c65b983ca5a209b14accf5805dc3d6b28f3b46842de9
font_02_sfnt_off00010dc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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