Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f365dbc76e899da…

MALICIOUS

PDF

86.8 KB Created: 2021-09-21 10:44:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 472d002ca1cdbc0bf184c74c8e43c364 SHA-1: a6e04be43fb8dcd45b42a1a6825b174e8b00fe49 SHA-256: 6f365dbc76e899da41c67e2db669bc2003bc1b57a955e87dfa3266e1b3dc7573
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the overall structure strongly suggest an attempt to trick users into visiting potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://fiumaradelsossio.it/userfiles/files/jiledolexufamop.pdf In PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613f5a465ac41---pebopunoxu.pdfIn PDF document text
    • https://officialbacknumber.com/editor_up/40637576807.pdfIn PDF document text
    • http://ski-experience-japan.com/images/blog/file/2190225790.pdfIn PDF document text
    • http://thekreativecompany.com/uploaded_files/userfiles/files/sewus.pdfIn PDF document text
    • http://turnwealthy.com/ckfinder/userfiles/files/97941196016.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f807e3cfc5---16385435331.pdfIn PDF document text
    • http://aa-nusd.jp/xojikikidij.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/sigipezatotekipimixax.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/60917808668.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1630749594.pdfIn PDF document text
    • https://polandpools.com/contents/files/5479842929.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/32cdo089fa9td6j9r0bpkelfso/27189280718.pdfIn PDF document text
    • http://hrt-foto.hu/_user/file/20096783420.pdfIn PDF document text
    • http://nuuts.mn/uploads/assets/tetulegu.pdfIn PDF document text
    • http://galsabino.it/userfiles/files/bumabomufepatejakubiko.pdfIn PDF document text
    • http://pscemetery.com/userfiles/file/zazudexonituzitaj.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/k60jls7fjjugtlpo52f4jt5fho/kefujutopaludav.pdfIn PDF document text
    • http://agapetown.net/ckfinder/userfiles/files/43476873513.pdfIn PDF document text
    • http://tk-weld.com/images/library/File/mezupevibo.pdfIn PDF document text
    • https://www.truckersplantparts.co.uk/ckfinder/userfiles/files/67640910444.pdfIn PDF document text
    • https://tefen67.com/userfiles/files/12613850532.pdfIn PDF document text
    • https://cytokin.ca/upload/editor/file/99339396388.pdfIn PDF document text
    • http://yuhao-tech.com/userfiles/file/12497368023.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=chetan+bhagat+novels+free+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_off0000e3fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3FB 10864 bytes
SHA-256: 9b391929a09b3875626cd6de562df172308167f624a4ba8e839789ef0da5f938
font_01_sfnt_off0000fcec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCEC 21312 bytes
SHA-256: 4867b8c78348098fb264330aed96097dd99af732c47b419e3e03fb2a69ee6c8f
font_02_sfnt_off00013563.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13563 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1