Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6e49535275d28cd…

MALICIOUS

PDF

90.6 KB Created: 2021-07-31 10:53:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a59007ed769620136b13487dc13689fd SHA-1: 7921c171475e84a901dc1ae77ffe528ad3b80185 SHA-256: c6e49535275d28cd1b1a3d12cc38407489a27a07e19275fe9a8189cd3d14b1e6
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier. Heuristics indicate it functions as a link farm, pointing to numerous URLs hosted on compromised WordPress sites. These links are likely intended to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b5dc1330661---vafefegewe.pdf In PDF document text
    • http://www.facyt.com.ar/ckfinder/userfiles/files/fibipeguju.pdfIn PDF document text
    • http://teaandtiara.ca/clients/c/cf/cffd5a667a547ddf6f7ed7e454f715b7/File/45374937751.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/50fb768b7f74d2533be9c67fe8f3bd94/fogosivepafadubun.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/xejiwuwuvilu.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160aaa00618ed6---32615953276.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074d2d47dba9---daxedagodako.pdfIn PDF document text
    • http://wagnerfamilyreunion.com/clients/866685/File/makazevipefukeziju.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072714fee90a---34872274494.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202104/file/galebofel.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/lbrg0shqbhgp2elqu02r37a6p4/21644923047.pdfIn PDF document text
    • https://remoteyourstaff.com/calisma2/files/uploads/pasisimomases.pdfIn PDF document text
    • http://kahounova.cz/userfiles/file/96187680012.pdfIn PDF document text
    • https://llsindia.in/FCKeditor/file/vexitejizogeputamil.pdfIn PDF document text
    • http://dokturmice.com/ckfinder/userfiles/files/woxijamiviv.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a36bf3817d6---gibanudeput.pdfIn PDF document text
    • http://angelofthewinds.net/ckfinder/userfiles/files/zanusipu.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160feff1801b59---27889625481.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a79786afdba---68942827187.pdfIn PDF document text
    • http://riggi.ru/userfiles/file/69553291516.pdfIn PDF document text
    • http://10glazsikeyrosa.ru/file/91210216728.pdfIn PDF document text
    • https://juraganmonyet.com/contents//files/51626879924.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b7db97b25c8---rivegup.pdfIn PDF document text
    • https://samavetpharm.com/userfiles/files/70508744818.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a51e94cc395---80878798561.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=how+to+set+up+focusrite+scarlett+solo+on+mac+fl+studioPDF 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_off0000fc59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC59 17680 bytes
SHA-256: 2f0f204b4b5c05c6cc0e109073e33623470fa32180641a77ba18cb2f05bfda7d
font_01_sfnt_off00012aaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AAF 10956 bytes
SHA-256: 5296f0450a6e7ef4fe41586d024da3c503b133fd520437399d87e42f60e97d0e
font_02_sfnt_off0001441e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1441E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1