Malicious PDF — malware analysis report

Static analysis result for SHA-256 777e3fd82de6c1a9…

MALICIOUS

PDF

87.2 KB Created: 2021-07-23 11:09:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 25f4380ebe056884562ff931e93b7e73 SHA-1: e1c89d18246b10ce84a14a714414539fd0feda03 SHA-256: 777e3fd82de6c1a929a33ac48c6dd50a41ab4ae74b0b04857b4f2ba8bd17830d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The document body is heavily obfuscated and unreadable, but the presence of external links and the overall heuristic firings indicate an attempt to redirect the user to malicious content, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/4i9u29o6bboq1mhu6jhvq3qtbi/72109702981.pdf In PDF document text
    • http://hndgyl.com/v15/Upload/file/202162699357019.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607398643a4b9---wejemojof.pdfIn PDF document text
    • https://srilangkapools.com/contents//files/jenalag.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba79b22e37c---wipaxifif.pdfIn PDF document text
    • http://bahsclassof1965.com/clients/1/1d/1db829f64c2e26d3b32b12ccabba4d7c/File/fufokiwebigusepitasosu.pdfIn PDF document text
    • http://bundoreh.com/fckeditor/files/file/79863911248.pdfIn PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/13580689970.pdfIn PDF document text
    • https://xosobacninh.vn/webroot/img/files/fomanivoso.pdfIn PDF document text
    • https://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/b2f72e890748743f8d1d9be7b8ece274/puwiwu.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a310a868c15---40242927602.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/isurkclemdpq7troplf7i2u4mu/xewidonofafetofun.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/kedut.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160864913194a0---sanowusuxizifasurego.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160784618cf860---99436269475.pdfIn PDF document text
    • http://midel.me/userfiles/file/40489306909.pdfIn PDF document text
    • https://hmanagement.net/userfiles/file/gurolotapedimutog.pdfIn PDF document text
    • http://dienmaythanglong.org/uploads/files/13067580118.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/p9esmm8liclkrrqo0j19sh91tt/44091207659.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/hvbarntfi6re4suk4levggigu5/kasoravexinifupaz.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d05dd82484---25832409963.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/1078f6619e3a7c661c61c7f5e0167bc3/83434494566.pdfIn PDF document text
    • https://rcot.org/userfiles/file/68106093796.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=adverb+of+necessaryPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#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_off0000f7d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D7 17004 bytes
SHA-256: 6929df6e21b843a07081b9ba55acb9ab993b71847107a729364ccb596a4b9f43
font_01_sfnt_off000123ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123EC 10532 bytes
SHA-256: b3c9c5ba93ecba401647f8cdd45690bc1c083cd48fe14af25f4e6bb37883279a
font_02_sfnt_off00013c18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.