Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd85d318400325ae…

MALICIOUS

PDF

99.7 KB Created: 2021-09-12 10:42:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 77deac9f665d9d75bf594dcb0e20d251 SHA-1: 532409829ce799a40082363577f78665aa343a45 SHA-256: dd85d318400325ae2bb6ce289748f862f263833e3cdf39aa9bf5c7b0ad1dbab5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a significant number of embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to obscure the ultimate destination. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. The presence of numerous external links suggests an attempt to redirect users to malicious sites, likely for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9800

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://boatmonies.com/uploads/files/viboxumamulorib.pdf
    • http://k12kos.com/ckfinder/userfiles/files/xujurekusajitezixu.pdf
    • http://www.jysunshine-hotel.com/up_files/file/12324454535.pdf
    • https://ldcpc.com/ckfinder/userfiles/files/xomolipukawupi.pdf
    • http://starinviter.com/ckimagefiles/felakisapiperix.pdf
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161315ba726384---4558107026.pdf
    • http://www.ocptecnology.com/admin/uploaded/fck/file/52496237876.pdf
    • http://musicfriend.vn/public/default/ckeditor/files/nixuviviruxixa.pdf
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136203958bd7---wigimilalavaxeke.pdf
    • http://wowbond.com/upload/Fckeditor/file/29528345102.pdf
    • http://ecme.site/2015/vat/upload/files/2336170416.pdf
    • https://inprovitparaguay.com/ckfinder/userfiles/files/70244556201.pdf
    • http://www.abcklima.hu/data/editorfile/vutamimapipilo.pdf
    • http://alvit-bk.ru/userfiles/file/40255036466.pdf
    • https://weishinclinic.com/uploads/files/202109051738363672.pdf
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/62d88650d7b978853e9a088262a18d03/torakejibetajunifew.pdf
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/navaxetutinix.pdf
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/msp5t4qij9hnasd7hbeshgtijf/55126211367.pdf
    • http://mateuszkucharski.pl/admin/file/jamizavirogidawa.pdf
    • http://atenngo.com/admin/sites/site/documents/xurimanawolejolazubabenol.pdf
    • https://wanfutemple.urwaydesign.com/data/file/userfiles/files/75667286605.pdf
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/61d4a691bb4c45544b6a74cb21075e0c/31420888767.pdf
    • https://aljazeerahpetroleum.ae/userfiles/files/ziritazajukoguweramerowoj.pdf
    • http://yachtales.net/admin/userfiles/files/42175526611.pdf
    • http://thepnguyentran.com/media/ftp/file/wuzorirafopupinugubimax.pdf
    • http://ozdesignhouse.com/app/webroot/uploads/files/winaluru.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=android+emulator+set+location+not+working
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011fd9.bin
a084f03a41fab912ba2174713ed23bac154825efdb4d156eaac6444aa1b74eb9
pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD9 10972 bytes
font_01_sfnt_off00013935.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13935 16792 bytes
font_02_sfnt_off00015147.bin
d5505554f483de03f7c5d0d5e551da055599426f217badfe432a70a33a3fe1c9
pdf-font-stream PDF embedded font (sfnt) at offset 0x15147 18044 bytes