Malicious PDF — malware analysis report

Static analysis result for SHA-256 fad253cefb1d11d5…

MALICIOUS

PDF

69.9 KB Created: 2021-09-08 14:22:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7bb43131e2625bc7739d93fb8880d140 SHA-1: 11adde15b046cede48b88eec8c8e1971cbb6fe26 SHA-256: fad253cefb1d11d53de766e6b8d2fc992c74bd51b44427bfecb52807f5ecf4d7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to multiple compromised WordPress sites and other domains, suggesting an attempt to distribute malicious content or redirect users to phishing pages. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://kingsfci.com/userfiles/file/21184977381.pdf In PDF document text
    • http://greenglobepms.com/uploads/gaxadufugirupuwoxeked.pdfIn PDF document text
    • https://emotionalgift.com/ckfinder/userfiles/files/59427393831.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16133ff505ee9e---xejilesoloxuloxixa.pdfIn PDF document text
    • http://elcampoeco.org/FCKeditor/file/9834305833.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136d42e99129---bofojawuwit.pdfIn PDF document text
    • http://erictex.com/ufiles/files/simojawisafozezel.pdfIn PDF document text
    • https://groupburuemas2.com/contents/files/junesewisubigaz.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/52079015036.pdfIn PDF document text
    • http://marmaraisg.com/images_upload/files/11471420402.pdfIn PDF document text
    • https://inprovitmexico.com/ckfinder/userfiles/files/ravejotugisupewozunoruji.pdfIn PDF document text
    • https://ruh-center.ru/userfiles/file/doburanilipuzulozoze.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/narovavikexowugasiboz.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/93044091967.pdfIn PDF document text
    • http://fnathservices.com/upload/file/50237098694.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/aca84b251a913a48540f512cf72be592/zejipujo.pdfIn PDF document text
    • https://majubesar.org/contents/files/wofodenigawotuxopajot.pdfIn PDF document text
    • https://megatex.ua/images/uploads/file/62354898641.pdfIn PDF document text
    • https://didacostruzioni.it/userfiles/file/21760123473.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/16133fe2955254---xetajegoriris.pdfIn PDF document text
    • https://ssekolkata.com/ckfinder/userfiles/files/96675705337.pdfIn PDF document text
    • http://xn--aknmedical-yub.com/uploads/file/68957325829.pdfIn PDF document text
    • http://zxsolar.com/d/files/tepusiravijalexora.pdfIn PDF document text
    • https://i-chat.tw/js/ckfinder/userfiles/files/guxazirotikaxakixatin.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133296b77bd3---jatafewejogowogajemadeso.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/32f78d3f31e1db7234dffb889a0047ad/kukedonilatepuvilabowadug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=fashionary+bag+design+a+handbook+for+accessories+designers+pdfPDF 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_off0000b410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB410 14360 bytes
SHA-256: cd14bb2481bffa7381dd2778c62445bbcafdf7c11b3f42a455a0e30e19924088
font_01_sfnt_off0000d81d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD81D 11076 bytes
SHA-256: 7ee1baaa01eed5f5eb7e9c0fd13d31c3bbb93a135d90a693c83a086e69422fe7
font_02_sfnt_off0000f178.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF178 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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