Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6d30e6ebc1cdb90…

MALICIOUS

PDF

92.2 KB Created: 2021-09-07 19:33:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 12c3da0aec1c46e27afb2cb44c2f4500 SHA-1: 4ff9b86fbe73f89acbc9de5459b22d5cc75fa45b SHA-256: f6d30e6ebc1cdb901000b0dc9d23c58f17845d7b881b36001e73e562ec2a4fec
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to compromised CMS uploads, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the presence of embedded URLs and the overall structure point towards a phishing lure designed to trick users into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095577ca251d---vadowesupebuvu.pdf
    • http://fkhd.cz/data/img/vipes.pdf
    • https://konyaalotaksi.com/userfiles/file/75578744295.pdf
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/nbk4vg0nf72ol5ehm840u25tg2/70826577507.pdf
    • http://knowleangling.co.uk/ckfinder/userfiles/files/zuriwifojororebel.pdf
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161247debd8ccf---88886902703.pdf
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce757e4c39---48715910332.pdf
    • http://thepnguyentran.com/media/ftp/file/15747504923.pdf
    • http://votejoedestefano.com/editorData/file/jitivivozinude.pdf
    • http://greathorserider.com/ckfinder/userfiles/files/tikebomewakusukimej.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/nnd2ibc015btduj8r6paku7582/paxorur.pdf
    • http://farmaciafasolis.eu/userfiles/files/gukitox.pdf
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16085d66b2dc6a---lesafokimeron.pdf
    • http://ozgu-yapi.com/firma/files/70778996428.pdf
    • http://tao-oita.com/admin/upload_filesfile/2529796709.pdf
    • https://balaji-technology.com/userfiles/file/fiwipezodujamul.pdf
    • http://assushop.com/userfiles/assushop.com/file/50199016176.pdf
    • https://venefoil.com/ckfinder/userfiles/files/95000633567.pdf
    • https://arrayamed.com/userfiles/file/zazumumiranarufetid.pdf
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610a7de0c833e---84411638346.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=chuy%E1%BB%83n+%C4%91%E1%BB%95i+pdf+sang+word+mi%E1%BB%85n+ph%C3%AD
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d972.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD972 16792 bytes
font_01_sfnt_off0000f189.bin
fa76fa1c12e239169a4a7420b08b36ab6ba0d81a5faeff64f881677bc21007fb
pdf-font-stream PDF embedded font (sfnt) at offset 0xF189 11944 bytes
font_02_sfnt_off00010ccd.bin
2c21ff3ceeb7a5749d3d52712a08aca31fcce6c6a030d08a19a294d8f4050a43
pdf-font-stream PDF embedded font (sfnt) at offset 0x10CCD 16124 bytes
font_03_sfnt_off00012234.bin
7db9ffaf366373590c167f73474d7f07aa7fc22e2ca4b762f0cfafe21b3ec5a5
pdf-font-stream PDF embedded font (sfnt) at offset 0x12234 24928 bytes