Malicious PDF — malware analysis report

Static analysis result for SHA-256 ade6c215203b89f1…

MALICIOUS

PDF

69.4 KB Created: 2021-09-29 02:35:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 51f9976e84fec6e8378ae8f54aa4f3bd SHA-1: 14e4c30af7d4f8312d312a0e211607ff60e3bebd SHA-256: ade6c215203b89f18525bfea4bdd924ab0e82549565ad783924d94c360924af3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as a phishing trojan. It contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The presence of multiple URLs, including a link farm hosted on disposable domains and pointing to other PDF files, indicates an attempt to distribute further malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://satisfytech.com/ck/upload/files/puxevajozasadu.pdf In PDF document text
    • http://shrlie.com/upload_fck/file/2021-9-3/20210903025144395320.pdfIn PDF document text
    • https://milliondollardesiclub.com/upload_files/featured/files/tusevupafef.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16140e9706beaa---fegejizifafarokevejidig.pdfIn PDF document text
    • http://studiospazioambiente.it/userfiles/files/kazogiwobajut.pdfIn PDF document text
    • http://nage-z.com/ckfinder/userfiles/files/bafodum.pdfIn PDF document text
    • https://thanaclusterwestgate.leaddeehub.com/userfiles/files/kavatide.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16140021494ab3---24282611083.pdfIn PDF document text
    • http://uzks.hr/upload/datoteke/gujanokarirut.pdfIn PDF document text
    • http://intproplaw.com/admin/uploads/file/pibinizotuxosa.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/d4786301ce3c42dcb7e365c05e0a3f07/2775625894.pdfIn PDF document text
    • http://ventexevent.se/uploads/file/keteloxovefiwanisafej.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/c0e64709cee4a94672079481e250d769/sofatirejunovogenusifarup.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/faa0194b0cb826669066e1134e63a5ab/59857737844.pdfIn PDF document text
    • https://chokysitohang.com/Uploads/userfiles/files/6212751281.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/84378720281.pdfIn PDF document text
    • http://stonebreaker.at/nomolebavidozi.pdfIn PDF document text
    • https://najlepsze-w-polsce.pl/uploads/1866331160.pdfIn PDF document text
    • http://ginzaramen.us/uploads/files/40985999211.pdfIn PDF document text
    • http://rockpapersun.com/upload_mce_image/file/7831362030.pdfIn PDF document text
    • http://rosritual.su/app/webroot/js/ckfinder/userfiles/files/94801670227.pdfIn PDF document text
    • https://natatourism.com/userfiles/files/fajelebubizufubexixonij.pdfIn PDF document text
    • http://viettruss.com/upload/file/36942358618.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=coc+magic+hackPDF 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_off0000af7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF7A 16676 bytes
SHA-256: d7fedcd8d7cb78d48732e26dc9ad9746128aafffea0f9ca71f7b1179320e1258
font_01_sfnt_off0000da03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f21a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF21A 10152 bytes
SHA-256: 7f16ba5f5927c8d882a80e7ce557041b118055a05a3f052bc069353c44642283