Malicious PDF — malware analysis report

Static analysis result for SHA-256 edb4ebdf42efd150…

MALICIOUS

PDF

127.0 KB Created: 2021-07-08 04:56:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fedba9a23e5e34f9289b3d544d292cab SHA-1: dcef51b7b5a44558ca7b009a11dbe87cd187f471 SHA-256: edb4ebdf42efd15012507d9ea0a57f537151ebe3641d2cc9e92c966dd59505fd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for executing malicious code within PDF documents. The numerous external URIs, many pointing to compromised CMS uploads and disposable hosting, indicate a link farm designed to redirect users to potentially malicious content. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9921

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://coretry.ru/uplcv?utm_term=william+appleman+williams+the+tragedy+of+american+diplomacy+pdf
    • http://bezagsecurity.cz/userfiles/11701001900.pdf
    • http://xn--eyt274i.com/upload/files/77378180355.pdf
    • http://burchiellati.com/file_fck/file/raterevilexonetelogixas.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/55bc7fe7813e820f7368b0bece4e032e/gonekunekibil.pdf
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607178e87e783---15474786532.pdf
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606e64866a3fd---77071796036.pdf
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/c15a7fa4df2fef7bde86f9c34e903b9b/9941497929.pdf
    • http://jdhs77.com/clients/58520/File/jugasara.pdf
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160afb2ca7e9db---50912279157.pdf
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbaef855c8---mekewuxed.pdf
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa6f8a683d---42984762555.pdf
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095b468796e1---24931337679.pdf
    • http://pazzo.jp/js/upload/files/mupip.pdf
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af7d1528a85---gilomadezug.pdf
    • https://dakhoathienhoa.net/images/files/bawumejeziratiru.pdf
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/129e66a5f6da50ca8786a0540e82f738/56117331761.pdf
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160874ef326c9a---bawip.pdf
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/of2dk8qctol045f22m1j7q2rc7/97332082985.pdf
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/4eb5b71b30c8554a44c8cec5d5caa199/foxuzinasaw.pdf
    • http://timandlor.com/userfiles/file/71891252303.pdf
    • http://hncastlecable.com/d/files/lufovotufopizikiponax.pdf
    • https://cottonweb.net/userfiles/file/fodunaziluwuwuvifikod.pdf
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084eff0b4afc---simenanoxufisuzowojulewus.pdf
    • http://www.sport-konyv.hu/userfiles/file/71185765530.pdf
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080d71819f64---nokovifimakifasovoros.pdf
    • 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_off0001901b.bin
65291464d48659fb41fc74169f153bf300c8dca89cbb5f86e4da0940afe09600
pdf-font-stream PDF embedded font (sfnt) at offset 0x1901B 17000 bytes
font_01_sfnt_off0001bbef.bin
158f9589997b8e6d10e4e879ab08ab9f9d01abd47b7f2d9ef629c1b5b13c4144
pdf-font-stream PDF embedded font (sfnt) at offset 0x1BBEF 11260 bytes
font_02_sfnt_off0001d5ff.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1D5FF 16792 bytes