Malicious PDF — malware analysis report

Static analysis result for SHA-256 46ddd9826287a30e…

MALICIOUS

PDF

72.8 KB Created: 2021-09-18 23:21:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5396c9a7ed944b5ae97f76995eaa3aa2 SHA-1: 5df3c23d0bc9723bf7271c9d3b62fd47391cb29e SHA-256: 46ddd9826287a30e76bfee70652b587eea9f8d7154bb88ad17716a739e7c3c40
164 Risk Score

Malware Insights

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

The sample is a malicious PDF detected by ClamAV and an ML classifier, containing embedded JavaScript. It also functions as a link farm, pointing to multiple distinct hosts, some of which are identified as compromised CMS uploads. The embedded JavaScript likely facilitates the redirection or execution of further malicious content, while the link farm aims to obscure the ultimate destination and potentially leverage SEO poisoning tactics. The primary goal appears to be directing users to malicious or compromised sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 https://weldingportal.it/userfiles/file/3670484805.pdf In PDF document text
    • https://www.abrasco.org.br/ckfinder/userfiles/files/nixorerebu.pdfIn PDF document text
    • http://ags-sib.ru/ckfinder/userfiles/files/pekum.pdfIn PDF document text
    • http://asorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vexedakojajaku.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613219e0203bb---25873761513.pdfIn PDF document text
    • http://zenkatsu.dk/files/99210547289.pdfIn PDF document text
    • http://bassbasement.org/userfiles/file/55033389558.pdfIn PDF document text
    • http://xenangheli.vn/public/files/gowibovidugejudomip.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9e0ca4614---4484650516.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd5cdb58a7---67775728388.pdfIn PDF document text
    • http://gps-ambroisie.com/ressource/site-image/files/gebisigo.pdfIn PDF document text
    • http://shiinamotors.com/js/upload/files/gagalimigib.pdfIn PDF document text
    • https://medpressa.ru/files/file/fokoxuredozagekope.pdfIn PDF document text
    • http://oticonshop.com/ckfinder/userfiles/files/pizutufawanuposowixuwow.pdfIn PDF document text
    • http://covina.crazyrockinsushi.com/uploads/files/11437469719.pdfIn PDF document text
    • https://businessincasey.com.au/application/third_party/ckfinder/userfiles/files/83627790452.pdfIn PDF document text
    • https://spvi.cn/filespath/files/20210902035509.pdfIn PDF document text
    • http://xn--2o2b17g32e8xisqq.com/userData/board/file/81067980939.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/warebekonorawozatupokol.pdfIn PDF document text
    • http://herbwaterthailand.com/userfiles/files/metawotegozelijarufag.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/15900939678.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=is+55+prime+or+compositePDF 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_off0000b9e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9E8 17104 bytes
SHA-256: e9fe3c919b1d535de038443eb39df0767fad8924a8020d98c196369041fee551
font_01_sfnt_off0000e674.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE674 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE8B 10308 bytes
SHA-256: 102f0663e30f5f4ed26269366bdd608f597f8b9f3811a8c5c898b0ca54cd3f9b

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