Malicious PDF — malware analysis report

Static analysis result for SHA-256 d14e455ca9ff0263…

MALICIOUS

PDF

91.0 KB Created: 2021-07-08 01:38:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cdce33553607e23230ece6797fed55f1 SHA-1: cc3433a3072ad7a5d74e73791416b040cc1c4e00 SHA-256: d14e455ca9ff0263ecb3f74259425c4ce07f89582a54bbb2692a4b4beee5b9d7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/5f95fa7af480ac2a0811affb13734ba5/89194748541.pdf
    • http://flomojapan.com/upload/files/92911063395.pdf
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/9d15853c8550af9406b578f4066344fa/29916819048.pdf
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/60071351221.pdf
    • https://bishopsalamatkhokhar.org/userfiles/file/xekumemiwumafiv.pdf
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/9e5d84e96498e417590d0918e649b0dc/buginitur.pdf
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b030541ea---pogodewujadamixe.pdf
    • https://firsatpin.com/calisma2/files/uploads/losiru.pdf
    • https://abyway.lv/images/ck_images/files/peremudepadenedutunej.pdf
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/9d05b328f7fec185027eec16b285d5a1/nusoxisami.pdf
    • http://kingsfinancialconsulting.com/userfiles/file/99512839790.pdf
    • http://rubivina.com/Images_upload/files/53196744579.pdf
    • http://bright-mineral.com/uploadfile/file/2021061901452281.pdf
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/r7vhrvqthvhuip7tkiolk4re5b/bosisebalilonipe.pdf
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/52693970692.pdf
    • http://cjcounsel.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/davagovamolu.pdf
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/70487162226.pdf
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160cb11ba3fd65---lafulipulemidadigawumazox.pdf
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607114d4d8403---37184714435.pdf
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fc438e1616---82661791106.pdf
    • http://chayka-svg.ru/files/31822862430.pdf
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160909a77dd383---wuvepizaxofiputo.pdf
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/f25bd5fc0864fc3a9e54ba69933b1b60/nimor.pdf
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/367a88674fdb22624d6568a8410b8c20/27607479111.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=how+computer+clock+works
    • 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_off0000fead.bin
b38f9e3e78e347556c88a307c3d0cae89c274d1f82b048fdbcc3010f7d494250
pdf-font-stream PDF embedded font (sfnt) at offset 0xFEAD 18260 bytes
font_01_sfnt_off00012eef.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12EEF 16792 bytes
font_02_sfnt_off00014706.bin
9513cd9ce966d555e45babc20f9eb322ce036f31ca25c0208738987112728e88
pdf-font-stream PDF embedded font (sfnt) at offset 0x14706 10444 bytes