Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2102bed5222b734…

MALICIOUS

PDF

74.7 KB Created: 2021-09-21 01:45:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: d1f8f6a164e427b5e18e431e084986a2 SHA-1: 9efbefe2ec6a7bc1d06a2e7cdaef0e7f06c2f46a SHA-256: a2102bed5222b734c38cba306a21feb8b7692f6c9d7d5cfc46289cf564202dea
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a tactic of directing users to malicious content, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://crewmak.ru/uplcv?utm_term=the+great+gatsby+download+pdf PDF link annotation
    • https://xanbiente.de/userfiles/file/nafobiwusik.pdfIn PDF document text
    • https://stw-nowogard.pl/download/file/95212377215.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614557401e39d---farepobefugipojesaton.pdfIn PDF document text
    • http://mnwebdesign.dk/userfiles/file/42729911441.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/mumaduwamuruw.pdfIn PDF document text
    • https://jungleflightchiangmai.jungle-flight.com/Uploads/files/kosalapos.pdfIn PDF document text
    • http://turningpointdigital.com/cote_dor_import/admin/ckfinder/userfiles/files/suvitogujaden.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/numeforipenuvediru.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-9-1/20210901133051275918.pdfIn PDF document text
    • https://www.scmsgroup.org/ckfinder/userfiles/files/23416803955.pdfIn PDF document text
    • http://www.swaving-stalinrichting.nl/ckfinder/userfiles/files/1483509202.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///zonukojikigozugaxobeso.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133646819549---26573187425.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/24fabb82a4a56f7668542712e40185d9/supesepom.pdfIn PDF document text
    • https://svltv.in/userfiles/files/36522732123.pdfIn PDF document text
    • http://fanti-fitness.pl/uploads/assets/file/jibarota.pdfIn PDF document text
    • http://immobilieninvestors.com/userfiles/file/56229114705.pdfIn PDF document text
    • http://cl-metalparts.com/d/files/69888629438.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/05o0m96a1c3kpk2sf2qceuqdn5/25131950660.pdfIn PDF document text
    • http://xszhuhai.com/uploadfiles/files/11915505781.pdfIn PDF document text
    • https://detectagsafety.com/ckfinder/userfiles/files/64810069206.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/vajukitunubokixavilajazor.pdfIn PDF document text
    • http://tchid.net/userfiles/file/17236446902.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613580d950967---ratotinakimizutevidukojaz.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_off0000bd07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD07 18172 bytes
SHA-256: 8c5a927eecf9b5ada2332388283a275f601aa0af7392a635248eb98f0710a620
font_01_sfnt_off0000ec0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010423.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10423 10988 bytes
SHA-256: bf84546934de7b8910bfd54b7ed5101e02a110008552edae3460a8c7a59796c8

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