Malicious PDF — malware analysis report

Static analysis result for SHA-256 658f84b54628fdcc…

MALICIOUS

PDF

76.1 KB Created: 2021-09-19 09:55:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c37a074c6dee6397766833c2fa823a6d SHA-1: a8e02de68c6d592c71b380a689e6a0a2b97c1528 SHA-256: 658f84b54628fdcc43b037090d98a7ad6b13e77a2c58d413ab0a33e3074afafb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users. The PDF also functions as a link farm, pointing to numerous external URLs hosted on potentially compromised or disposable domains, suggesting an attempt to obscure the final destination or distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://irfanmakina.com/depo/sayfaresim/file/67860495625.pdf In PDF document text
    • http://hertzlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fagef.pdfIn PDF document text
    • https://reaga.net/js/ckfinder/userfiles/files/1297794023.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/25491933154.pdfIn PDF document text
    • http://choragwica.pl/userfiles/file/62094800769.pdfIn PDF document text
    • http://rimini-portal.de/bilderarchiv/file/wevimag.pdfIn PDF document text
    • http://asremajazi.com/uploads/files/mazubemipinuva.pdfIn PDF document text
    • https://8cj2aja7-8mxb.com/contents/files/8755520113.pdfIn PDF document text
    • http://www.udelimpa.es/ckfinder/userfiles/files/82544005089.pdfIn PDF document text
    • http://lafenicealcamo.it/userfiles/files/71678989205.pdfIn PDF document text
    • http://www.xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/simixefilizanogudexerom.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/16139355be00d6---mepinutomapenujijinizuv.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///levaxamipobitevitideb.pdfIn PDF document text
    • http://daisin1977.com/js/upload/files/2571758008.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/159b087184bb889ac8bf835e0b62eddc/80221833439.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/cc5eb29262bd85f2515e220f7f1e7f58/68627715471.pdfIn PDF document text
    • http://saaretravel.ee/images/file/kovinokeraluwedep.pdfIn PDF document text
    • https://hsse.hssanesteban.cl/files/fakobalimanu.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/wipaj.pdfIn PDF document text
    • http://ngocphuocjsc.com/public/default/ckeditor/files/31511510744.pdfIn PDF document text
    • https://legouic-peinture.fr/userfiles/file/93778582614.pdfIn PDF document text
    • http://dc-a0dcf319a153.breakthroughsport.com/userfiles/files/zidow.pdfIn PDF document text
    • http://esistore.be/userfiles/file/wuvutoxoperegujevesafib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=check+website+top+keywordsPDF 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_off0000c490.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC490 10760 bytes
SHA-256: 9a4e1e4dae1ed31e55416c54e8c97eab8a77474ffe473e44f65349acbe40efd6
font_01_sfnt_off0000dd5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f56c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF56C 17440 bytes
SHA-256: c0c0c83f59f299939a6082b7d6933a9e0c133cf725af0593f742c5670e44dbe0