Malicious PDF — malware analysis report

Static analysis result for SHA-256 576754f4cbec6d86…

MALICIOUS

PDF

99.0 KB Created: 2021-09-13 20:14:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 98a514bc30bbfd96182d6c57e11a96b2 SHA-1: 70a88971199449075d0b3edc8065094e2192dca6 SHA-256: 576754f4cbec6d867ce4f2b61664ea5455c994bc832b78e0ebfe1f7210e52270
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with common phishing lures.

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://swalaya.in/userfiles/file/kifunasisajadajix.pdf In PDF document text
    • http://didula.com/img/file/83660364451.pdfIn PDF document text
    • http://vikohasanfiber.com/upload/files/tegukawa.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16136a108f3439---nelumager.pdfIn PDF document text
    • http://wernitznigg.at/files/bemavajogakupemusupiju.pdfIn PDF document text
    • http://efrex.cz/files/file/gogukefuxabisev.pdfIn PDF document text
    • http://stoewebdesign.no/userfiles/file/31205631213.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/54246913222.pdfIn PDF document text
    • http://farmina.ru/uploads/files/fedevudadogoxiwufuxabuli.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/19072988711.pdfIn PDF document text
    • http://wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/5897030849.pdfIn PDF document text
    • http://www.sm.ac.th/ckfinder/userfiles/files/gutixasirubobumixen.pdfIn PDF document text
    • http://stavo-bazar.cz/userfiles/file/sexemewerevavadotezum.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/lekojalidimadowavibimekuf.pdfIn PDF document text
    • https://almudenafernandez.co/ckfinder/userfiles/Files/11301152870.pdfIn PDF document text
    • http://ekmeta.lt/failai/file/felonuzir.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613519f2db50e---76614803394.pdfIn PDF document text
    • http://csc-vietnam.vn/uploads/userfiles/file/90452635016.pdfIn PDF document text
    • http://catherine-massage.com/ckfinder/userfiles/files/juletizogelazinitatake.pdfIn PDF document text
    • http://uptownherndon.com/uploads/files/fivewolef.pdfIn PDF document text
    • http://www.oomedia.com.tw/ckfinder/userfiles/files/50715457858.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134787100b43---zivusi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=instalar+exe+en+androidPDF 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_off00011c93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000134aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134AA 10296 bytes
SHA-256: b721db3975718ea18b6801d3637b0c0a95debc7d5be82ad4bc0e0ddab5b7664a
font_02_sfnt_off00014bf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BF9 19400 bytes
SHA-256: cbfec6ca7a4132b04120a7a60e4a577603ef4e30133159c995346f8d07b1b742