Malicious PDF — malware analysis report

Static analysis result for SHA-256 221709473982498c…

MALICIOUS

PDF

87.3 KB Created: 2021-09-19 17:15:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 41ed2fe34faa9cf7d3491254ee130ad4 SHA-1: 56fe0e5aada07a232666e53b86049d868c215293 SHA-256: 221709473982498cfea3df86adcb8d7a1c6b13d4c76577ffb4b6584dbf494b5d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous links to compromised websites, many of which host further PDF files. This suggests a link farm designed to obscure the true malicious destination and potentially trick users into downloading malware. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

Heuristics 7

  • 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.
  • 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 https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/9bf6a562b6d4e58047d33fe827c43bd0/pavafudopatijivakegisuwe.pdf
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132e320bc084---48420662818.pdf
    • http://dayou.tw/uploadpic/files/202109121306373552.pdf
    • http://wpklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gexaxamisin.pdf
    • http://forti.in/userfiles/file/33932346911.pdf
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613189451aff7---veworojabekunonos.pdf
    • http://bjbtrh.com/files/pic/file/tugelanaxikimed.pdf
    • https://korankertas.com/contents/files/26901729789.pdf
    • http://pmrs.ps/userfiles/file/1115143218.pdf
    • http://live-net.it/file/vetuni.pdf
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16134335b28f65---moniniloxukurakedim.pdf
    • http://signfabapp.com/ckfinder/userfiles/files/22966156460.pdf
    • https://webhosting4.net/media/file/5364053304.pdf
    • http://schoonhovensvrouwenkoor.nl/ckfinder/userfiles/files/44299318957.pdf
    • https://akemi.ro/hirek/file/72563068410.pdf
    • http://cl-metalparts.com/d/files/bamemukavidodazimesare.pdf
    • http://nato-denkmal.de/uploads/file/33845381712.pdf
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130d8299af20---63899603328.pdf
    • https://nurdagihaber.com/resimler/files/3867427688.pdf
    • https://maurinet.com/userfiles/file/denexuwosig.pdf
    • http://lonerangerfanclub.com/ckfinder/userfiles/files/30170385617.pdf
    • http://xn--66-6kc8bfmkmjd.xn--p1ai/admin/ckfinder/userfiles/files/86835681279.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=10+play+apk
    • 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_off0000c7c0.bin
22e6159d19f0cae2957c3ae87a02388f96601993c567a24a2e791bc96c6a1009
pdf-font-stream PDF embedded font (sfnt) at offset 0xC7C0 26732 bytes
font_01_sfnt_off00010b3a.bin
60110e38f071753f1418fc7c54a5bd91f984dfe33948beab09221fbb285c703f
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B3A 16568 bytes
font_02_sfnt_off000122a8.bin
6084cac2cee2613aba63a92187be9ebbce23ff6f5028e6187f667ee376269dcc
pdf-font-stream PDF embedded font (sfnt) at offset 0x122A8 9712 bytes
font_03_sfnt_off000137f2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x137F2 16792 bytes