Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae1ea6a024dd545b…

MALICIOUS

PDF

87.2 KB Created: 2021-09-12 09:15:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a813133d2392754f07d5c388ccb388bf SHA-1: 15e26337112de95ceac3ffff2aede2003dcc7541 SHA-256: ae1ea6a024dd545bd243edc6d0e64a1d1ee26ec452b792804ad87217dd41f827
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of multiple external URIs and a link farm structure indicates a likely intent to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crysiq.ru/uplcv?utm_term=movie+maker+exe PDF link annotation
    • https://5a.ro/ckfinder/userfiles/files/61699529813.pdfIn PDF document text
    • http://sirindhorn.net/upload/File/45943832356.pdfIn PDF document text
    • https://stdtekstil.com/upload/ckfinder/files/retusasopiruke.pdfIn PDF document text
    • http://kingkady.cn/uploadfile/files/rowopijekatesevil.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/c8b479a49a3f052a0a728d1c7c6cd042/82684621055.pdfIn PDF document text
    • http://xyr59.com/filespath/files/20210903234420.pdfIn PDF document text
    • http://ghinelliarchitettura.it/userfiles/files/76760944683.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16132d3e01c182---62875503015.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/7543458696e8d624454620deaa712db3/gijesi.pdfIn PDF document text
    • http://theponghop.com/upload/files/38268866705.pdfIn PDF document text
    • http://temple.mo/userfiles/file/vodoxorizekalipamejurawig.pdfIn PDF document text
    • http://mediacast.vn/ckeditor/upload/files/vifovegilutabogemijo.pdfIn PDF document text
    • http://newtrichur.com/userfiles/file/bivorexugedel.pdfIn PDF document text
    • http://studioboscono.it/userfiles/files/texug.pdfIn PDF document text
    • http://pilot-market.ru/new/files/file/jiletubudotukerow.pdfIn PDF document text
    • http://forepic.com/_UploadFile/Images/file/61963602216.pdfIn PDF document text
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/76990198308.pdfIn PDF document text
    • http://krzysztofmalec.pl/gfx/fck/file/kexagasevufas.pdfIn PDF document text
    • http://stoewebdesign.no/userfiles/file/13291754362.pdfIn PDF document text
    • http://king-pro.com/userfiles/files/sukomidu.pdfIn PDF document text
    • http://fittbikese.hu/files/file/80508861286.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16137771f0f53a---kovifolebomeloperuna.pdfIn PDF document text
    • https://resonanceacteurs.nl/userfiles/file/kitirologen.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/4f28b7676ff869544863dbeb90d2b7a7/zurotamodoxore.pdfIn PDF document text
    • http://surausa.com/uploads/files/11165764410.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd1b5c5b98---95057209651.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_off0000f279.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF279 17732 bytes
SHA-256: 33c89fee8022e192929e31eb8e56c84ad2119adca513c196361d80e87d548de9
font_01_sfnt_off000120c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000138d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138D9 10108 bytes
SHA-256: 541f716404aecc58fedc1dd7aa32f1305de9bb1427384a1ca5b58082ac7ebedf

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