Malicious PDF — malware analysis report

Static analysis result for SHA-256 a803e30d24063805…

MALICIOUS

PDF

78.7 KB Created: 2021-09-17 22:22:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8ec5a68e9c4812ddc5215b192f3c897c SHA-1: 8b2c7eba9ab707f60248b1fd3f079413e7b6910f SHA-256: a803e30d24063805d4e6fb40b33495b631fa0950f4fa0d680106690ec30610da
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to numerous external URLs, many hosted on compromised WordPress sites or disposable domains, suggesting an attempt to redirect users to malicious content. The presence of these links and the overall structure indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://synerhu.ru/uplcv?utm_term=android+root+2020 PDF link annotation
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd808dd212---woxutozedevabuvuzosul.pdfIn PDF document text
    • http://smwiarus.pl/ckfinder/userfiles/files/pujilu.pdfIn PDF document text
    • http://t-cso.com/upload/file_folder/file/2949395298.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/lno2u53vedr8v8sis3jqmoh0d1/busazivapiluwivenor.pdfIn PDF document text
    • http://m2m2design.com/userfiles/28086784349.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613e022948f74---49934321957.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/46930333993.pdfIn PDF document text
    • https://joebalogh.ro/imagini_ws/wiranitulonadenupilunik.pdfIn PDF document text
    • http://bloodfaces.de/attachment/file/paxexiwam.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/71c1a2db34222e4fde5404bebe1af095/71465599232.pdfIn PDF document text
    • https://tanhoaphat.vn/userfiles/file/voziku.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/pugukikubuxadupifoz.pdfIn PDF document text
    • http://arndt-fahrschule.de/userfiles/file/xujimolalok.pdfIn PDF document text
    • https://brincandoeaprendendo.com/fotosempresa/files/27800736656.pdfIn PDF document text
    • https://livre-art.com/ckfinder/userfiles/files/43640925181.pdfIn PDF document text
    • http://kotolantopeni.cz/file/putopejutopot.pdfIn PDF document text
    • http://hightopeducation.com/cms_uploaded/file/33155516250.pdfIn PDF document text
    • https://psystat.net/candyticket/uploads/page_images/files/96986136228.pdfIn PDF document text
    • http://bisenzia.it/userfiles/files/680022190.pdfIn PDF document text
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/juzozivipo.pdfIn PDF document text
    • https://baoyi-chuck.com/ckfinder/userfiles/files/botubugefati.pdfIn PDF document text
    • http://35ju.21tg.cn/uploadfile/ckeditor/files/poposekoxodi.pdfIn PDF document text
    • http://giovanninociti.com/userfiles/files/3947097417.pdfIn PDF document text
    • http://kolesnikov.pro/ckfinder/userfiles/files/57144751251.pdfIn PDF document text
    • http://oris-am.com/editor_up/ratagixogarikakut.pdfIn PDF document text
    • http://magooferta.pl/uploads/fck/file/bitawu.pdfIn PDF document text
    • https://businesslife.com/content/file/34383827751.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_off0000d304.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD304 16908 bytes
SHA-256: 54259193dfae7c40778e23d6dca8137ec98d92cbe5857ec3d3750042feb6e3a7
font_01_sfnt_off0000fef0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF0 9956 bytes
SHA-256: e0c8ad92ae942af33944249f8fcc1ae1c99c913651bdebc1c9271a57599d6d8d
font_02_sfnt_off00011513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11513 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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