Malicious PDF — malware analysis report

Static analysis result for SHA-256 50d6205a409dc29f…

MALICIOUS

PDF

85.2 KB Created: 2021-09-04 13:38:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7422ab1165eb527212541ba748a36739 SHA-1: 9b0df0030901d17b6389c220447b4f15b843adf0 SHA-256: 50d6205a409dc29f08aaec4ac6216d1399acb487a8115420550a408bbeb18407
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, each hosting another PDF. This structure suggests a phishing or malware distribution campaign where users are lured to click on links that ultimately lead to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/q2gulsccc73t5o61vtomnhhese/43568792864.pdf In PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/407715f9562461bede9bb30baee77ce3/mojuzaxupejipifolozasuves.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/l2ls520s019nn7n448c41ts85s/pikuzibuj.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/17149829122.pdfIn PDF document text
    • http://shelton1961.com/clients/35589/File/sopopinufuwevifoxikeveb.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ca2062a9f69---vonapajoxekijefi.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160887c2d91a4b---55183827931.pdfIn PDF document text
    • https://kitapkaplama.com/upload/ckfinder/files/7353676254.pdfIn PDF document text
    • http://klpa.net/userData/board/file/74203374755.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bca612c550---1521330187.pdfIn PDF document text
    • https://moscreen.in/cmsfiles/file/murilixur.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ab7bfb5105e---nizoxanuzetasulusi.pdfIn PDF document text
    • http://dfwarbitrator.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/51026216373.pdfIn PDF document text
    • https://bunexim.dascalita.ro/app/webroot/files/userfiles/files/gazis.pdfIn PDF document text
    • http://mrcubezpieczenia.pl/app/webroot/media/files/zijopidonojinere.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/bc6530623a6dab00d310610a4d3c78e9/95299780233.pdfIn PDF document text
    • https://rgcsmt.org/ckfinder/userfiles/files/fifajefijavepirada.pdfIn PDF document text
    • http://cn-biyoute.com/d/files/fixakufuniwazanefixu.pdfIn PDF document text
    • https://fibra-optica.ro/ckfinder/userfiles/files/16738092933.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608142f807595---wipirujawilivokazopiregu.pdfIn PDF document text
    • http://stavclearing.ru/upload/files/21459726732.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=trimble+business+center+5.0+manualPDF 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_off0000e8c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C1 17708 bytes
SHA-256: 858de030f637407a04e117051e4e9f047e86623e3ea014722cb2103263036aa1
font_01_sfnt_off00011698.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11698 10796 bytes
SHA-256: f6ef2d926130b83329a5a6673a8217a70ff29aec4a4fc509b21a00f90ca95273
font_02_sfnt_off00012f82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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