Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb125354542b9f30…

MALICIOUS

PDF

81.4 KB Created: 2021-09-02 22:37:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5f64c26f9c54707cb52bb34dc169937b SHA-1: e18c5ab86f558a25a6595ad9fabe933e1510b93f SHA-256: bb125354542b9f30cf5ce48cde94d6f5bce57db1a143fbe3935a67779962c70d
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites, suggesting a phishing or malware distribution scheme. The PDF structure and link farm characteristics are consistent with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609e31d2401a6---10845926745.pdf In PDF document text
    • http://esteticka-stomatologie.cz/files/content/file/47075446004.pdfIn PDF document text
    • https://shiphangnhanh.net/uploads/image/files/11484922995.pdfIn PDF document text
    • http://hcvitamin.com/webroot/img/files/gikazod.pdfIn PDF document text
    • http://namlongprojects.com/images/uploads/files/tusarigefugunogepanejela.pdfIn PDF document text
    • https://asi-filter.pl/files/file/68458257186.pdfIn PDF document text
    • https://mclandpin.com/calisma2/files/uploads/9804413397.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607e83078544b---lesujepur.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082c76bc980b---suvawodusalu.pdfIn PDF document text
    • http://al-farh-iq.com/upload/userfiles/file/30974817520.pdfIn PDF document text
    • https://bitree.ru/ckfinder/userfiles/files/romufiwakirawigumoveb.pdfIn PDF document text
    • http://kolesnikov.pro/ckfinder/userfiles/files/45747311040.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611739951d48b---xibav.pdfIn PDF document text
    • http://oxigensupplies.com/shipinc/userfiles/files/sagowuz.pdfIn PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/majiletatikela.pdfIn PDF document text
    • http://telesson.net/_UploadFile/Images/file/90979817877.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce60271437---91003338859.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16096a51726ed9---42547347147.pdfIn PDF document text
    • http://enjoybowlramenandpoke.com/uploads/files/77858047127.pdfIn PDF document text
    • http://hondatayho.vn/images/ckeditor/files/25090371322.pdfIn PDF document text
    • http://wawabed.pl/uploads/userfiles/file/16589612621.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/59778302941.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/non5qh6d604kp1br0r3l54kmco/11662697073.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=ciaphas+cain+choose+your+enemies+pdf+downloadPDF 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_off0000d8fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8FD 17192 bytes
SHA-256: 7e74075f4ef5a3ed3d30a8303b40c6bf762af23ca2572c22f8266227facd0414
font_01_sfnt_off000105a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A4 11120 bytes
SHA-256: dd5f69667a20d087f827c4d9a961b24193d23edc53f8e338d1f2067e9f47513e
font_02_sfnt_off00011f7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1