Malicious PDF — malware analysis report

Static analysis result for SHA-256 7467947995815151…

MALICIOUS

PDF

89.4 KB Created: 2021-09-12 08:26:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7238d3e1088b61036008c9cb338ff9ad SHA-1: 3a57d79c16c9388e904584b73064077786d12126 SHA-256: 746794799581515144541862b6065a62807d725c86ab12220ce89d8dab6fa76d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL analysis point towards a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://bientannamhuy.com/wp-content/uploads/files/zevod.pdf In PDF document text
    • http://fusheng-vietnam.vn/admin/webroot/upload/image/files/5886726594.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/c25d2661796013a2b45d3bab1eef65f5/72710128965.pdfIn PDF document text
    • http://tsuiteru66.com/userfiles/file/zukizewuj.pdfIn PDF document text
    • https://et-auditing.com/userfiles/files/20884279944.pdfIn PDF document text
    • http://av-jet.ru/userfiles/file/nepuwefukusekipija.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16134c6a6da320---60571791593.pdfIn PDF document text
    • http://daiichigroup.net/uploads/news_file/39641557462.pdfIn PDF document text
    • http://pmrs.ps/userfiles/file/35315990581.pdfIn PDF document text
    • http://logtech.cz/foto/Image/file/95462574004.pdfIn PDF document text
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/39273607824.pdfIn PDF document text
    • http://eternaseguros.net/files/files/6888552191.pdfIn PDF document text
    • http://seteo-dechets.com/images/file/rotewudalaritomuko.pdfIn PDF document text
    • https://lifeteacher.tw/uploads/files/202108312147196605.pdfIn PDF document text
    • http://photopuzzle.net/userData/board/file/14799985962.pdfIn PDF document text
    • https://goez1.com/10005001208290177/ckfinder/userfiles/files/35511638311.pdfIn PDF document text
    • http://adimhukuk.com/resimler/files/seriwojudojugef.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16131f1e5c4b71---73525124250.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161392912deba6---10606969529.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd222ccb0e---70983027324.pdfIn PDF document text
    • https://damsindia.org/admin/uploads/file/vafivozeresukelijeve.pdfIn PDF document text
    • https://www.igescanada.com/ckfinder/userfiles/files/tufuru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=mx+player+prime+apk+downloadPDF 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_off0000f763.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF763 10672 bytes
SHA-256: d5c86db0d28fe66e07155ad6676b1756c1240fc11999c1d8fb308b314738a07f
font_01_sfnt_off00010fd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD5 18420 bytes
SHA-256: d00ab0c44f7fb8456a39155e0d1be798463c5b3d15b15f33dee41689a3aecdbd
font_02_sfnt_off0001405f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1405F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1