Malicious PDF — malware analysis report

Static analysis result for SHA-256 80f9e96d229f8539…

MALICIOUS

PDF

78.7 KB Created: 2021-09-11 06:52:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7e06714265afcc1530feb9b5d0c24923 SHA-1: 9d0e6e1bde57bcd5d97721ad3ecf34c90c766d16 SHA-256: 80f9e96d229f8539d63534e610d4a5c3551fe875d622b584f61a665a18c16dfb
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Static analysis revealed it functions as a link farm, containing numerous URLs pointing to other PDF files hosted on various websites, some of which appear to be compromised. The presence of multiple PDF link farm heuristics and the overall structure suggest an attempt to lure users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://smart.sut.ac.th/tsme/src/lib/ckfinder/userfiles/files/bimevepelopeninabopi.pdf In PDF document text
    • https://onutglen.com/caningest/images/file/sulebuxuvot.pdfIn PDF document text
    • http://www.afurg.com.br/assets/ckfinder/userfiles/files/bakilepi.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/wubugolozopopo.pdfIn PDF document text
    • http://bancasemecanino.com/userfiles/files/jadovomozuf.pdfIn PDF document text
    • http://dreamsurgerycn.com/ckupload/files/rokarusoniwisuvixute.pdfIn PDF document text
    • http://ohadalegistrocbarter.com/ckeditor/uploads/files/79186031242.pdfIn PDF document text
    • https://francois-daulte.com/ckfinder/userfiles/files/jedoxevegubinusa.pdfIn PDF document text
    • http://studiosiciliani.eu/userfiles/files/pavumexobefulofom.pdfIn PDF document text
    • http://tianlanip.com/filespath/files/20210909231917.pdfIn PDF document text
    • https://gulfb2b.com/userfiles/file/67701270790.pdfIn PDF document text
    • http://mariamozharova.ru/uploads/files/6382886677.pdfIn PDF document text
    • http://millecolori.it/images/file/97066814040.pdfIn PDF document text
    • http://jagdrevier.hu/upload/images/file/dulezevamapowaxomuxabefir.pdfIn PDF document text
    • http://cosmosimpex.com/app/webroot/ckfinder/userfiles/files/momowagisozepawunegemet.pdfIn PDF document text
    • http://haiannweb.com/uploads/files/51682757128.pdfIn PDF document text
    • http://kcntanduc.vn/img_duhoc/files/gajopujazakesi.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16136a901a6968---47371579191.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16131c7651dd03---63058609857.pdfIn PDF document text
    • https://mp2020.csysadmin.com/ckfinder/userfiles/files/jirufujopu.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/16132312e66db9---feguxu.pdfIn PDF document text
    • http://kaiyudachem.com/filespath/files/20210904040415.pdfIn PDF document text
    • http://www.pvvc.cz/files/tebavubo.pdfIn PDF document text
    • http://mtt-association.fr/upload/file/refeze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=corporate+accounting+textbook+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_off0000ca02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA02 11044 bytes
SHA-256: 1f784424b7235ff604a460561a2a00b02b21155ffa0aae3fc0143f72f715e4b1
font_01_sfnt_off0000e373.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE373 18592 bytes
SHA-256: 7c14323bda5370a704d84ce0a05524f8f03bcf3a5a7ed13102a3d7a74784d65a
font_02_sfnt_off000113c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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