Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cc73962e783a026…

MALICIOUS

PDF

83.8 KB Created: 2021-09-12 17:52:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 28e4ca769735674a268bfe0df7834d5b SHA-1: e16b22b783f6a707f5e4c67ba4742fac09e854a9 SHA-256: 6cc73962e783a02645d6d3d692c1f94983de8044dbda14938cc0f935cfe808cd
196 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The heuristic 'SE_BROWSER_INSTALL_LURE' strongly suggests the document's purpose is to trick the user into installing a malicious browser extension or plugin. While no scripts were directly extracted, the nature of PDF exploits often involves embedded JavaScript to facilitate such lures, hence the inclusion of T1059.007. The numerous external links, many hosted on potentially compromised or disposable domains, serve as part of the lure or potential download locations for subsequent stages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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 http://lamachine.nl/userfiles/file/36929981953.pdf In PDF document text
    • https://negaratoto.com/contents/files/garusagubugebenokimuni.pdfIn PDF document text
    • https://tidaksusah.com/contents/files/39519721517.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/data/editor/file/73136535734.pdfIn PDF document text
    • https://renetravel.ro/images/files/96070763438.pdfIn PDF document text
    • http://budgettranslation.hu/sites/default/files/file/12415831659.pdfIn PDF document text
    • http://pokeocncafe.com/uploads/files/loxolegitibabane.pdfIn PDF document text
    • http://suriyedostlukdernegi.org/image/files/71839237847.pdfIn PDF document text
    • http://belean.pl/userfiles/file/56300054262.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c4718d7daf---66403490688.pdfIn PDF document text
    • https://carmelocuritiba.com.br/ckfinder/userfiles/files/24339276995.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613726523704e---bebixawolilevotovu.pdfIn PDF document text
    • http://www.w.radeton.cz/ckfinder/userfiles/files/piwetemej.pdfIn PDF document text
    • https://szpital-sulecin.pl/images/fckfiles/file/82501188700.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/fusudakekubipinovuwiga.pdfIn PDF document text
    • https://toolsatool.com/userfiles/files/44283749791.pdfIn PDF document text
    • https://taiwan-tiaya.com/upload/tiaya_official/files/90258351912.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612f2c1972ec4---83113108527.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5fbe4155f---84497969676.pdfIn PDF document text
    • https://ngaa.org.au/application/third_party/ckfinder/userfiles/files/jemomopowasixovuxomok.pdfIn PDF document text
    • https://cabsfromheathrow.com/userfiles/file/95784796996.pdfIn PDF document text
    • https://aslplastic.com/ckfinder/userfiles/files/kapoturuxeze.pdfIn PDF document text
    • http://xn----8sbfeahwarn6ac1adp3fb2p.xn--p1ai/userfiles/file/57068969299.pdfIn PDF document text
    • https://unitjaya.com/contents/files/vabobarubi.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202109010835529668.pdfIn PDF document text
    • https://citronel.com/userfiles/files/1562404232.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=how+to+block+notifications+from+a+website+windows+10PDF 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_off0000e153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE153 17612 bytes
SHA-256: 25ef424d4237085da0117afcba4391786b5033404a004220daf5828ec713b7c7
font_01_sfnt_off00010ecf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ECF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000126e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126E6 11120 bytes
SHA-256: 21236a05bc291eeab634c669aed7ed8d52aa2be91fab6505944c70c33b5687f5

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