Malicious PDF — malware analysis report

Static analysis result for SHA-256 dab8225650523eb3…

MALICIOUS

PDF

71.6 KB Created: 2021-09-25 18:59:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3fb9e39bbb986a978c9aa6e6d3595b13 SHA-1: b325f14cb91179ab5ff41b326f662212f6cecb39 SHA-256: dab8225650523eb3d75da4dfc451bd4dabd83d2bb553d228d3861e09de90ddce
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. The presence of embedded URLs and the nature of the heuristics suggest an attempt to distribute malware or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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://equalland.com/uploads/File/41129919248.pdf In PDF document text
    • http://zjbfjt.com/upload/files/75336851149.pdfIn PDF document text
    • https://krantiservice.com/ckfinder/userfiles/files/paruwesepodaloso.pdfIn PDF document text
    • http://mail-ex.net/userfiles/file/lokumelanabebowakemo.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/161493b799390e---sebofanipawexo.pdfIn PDF document text
    • https://hilanguage-com-tw.triangle-design.com/files/gifosukekoxovexe.pdfIn PDF document text
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gimirexiwezov.pdfIn PDF document text
    • http://seghers.kr/data/editor/file/212808087614f1a70b5eac.pdfIn PDF document text
    • https://tumsad.org/img/editor/image/file/41599282612.pdfIn PDF document text
    • http://malabarisproducoes.com/arquivos/files/jikajonik.pdfIn PDF document text
    • https://italvaping.com/file/1966894573.pdfIn PDF document text
    • http://zavalinka.by/var/upload/file/lunifinumugugoroluvonulon.pdfIn PDF document text
    • http://canadapremiumlubes.com/survey/userfiles/files/sitivexafanovi.pdfIn PDF document text
    • https://creativitagh.com/pevron/www/img/file/nukujebaro.pdfIn PDF document text
    • http://www.mecateengenharia.com.br/ckfinder/userfiles/files/luvimubinemixo.pdfIn PDF document text
    • https://gkatsov.com/userfiles/file/podimijirijajinufusedebu.pdfIn PDF document text
    • http://spellenindex.nl/images/uploads/90274088218.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16147c6da53d97---63435719125.pdfIn PDF document text
    • http://saigondome.com/uploads/userfiles/file/baguvomagu.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/tbqcckijpb43ths8qfg2ftd6g2/nuxatanibogamogivup.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fea7b5c78a---11747357292.pdfIn PDF document text
    • http://euphoriaclub.fun4two.pl/uploads/assets/file/katidulirawavufifiketux.pdfIn PDF document text
    • http://ecohouse-lab.com/userfiles/file/92358164518.pdfIn PDF document text
    • https://responsible-tourism-alliance.com/content_file/files/29511597064.pdfIn PDF document text
    • https://alcoquimicos.com/ckfinder/userfiles/files/jeduvonisajisotupinegute.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=how+to+transfer+all+data+from+android+to+iphone+after+setupPDF 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_off0000b514.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB514 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD2B 10940 bytes
SHA-256: d2acb3a41de0778534f237ffd356cafdbc9d82538a67dbce82fd082f6baa4d4d
font_02_sfnt_off0000e64e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE64E 16324 bytes
SHA-256: f05eb81a7c34b831766d6a30d9d6c06023517e6bb66a45a3d59d7e7d42656f9c

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