Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e0d255288ebe396…

MALICIOUS

PDF

73.4 KB Created: 2021-09-22 10:01:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cda94aa9be4be70d8000371fc44420ae SHA-1: 3e3bf8e410b8af051e105daca1385a601a0eb547 SHA-256: 9e0d255288ebe39654f59c2ef3fe508799f9da01d235184669579842f10c0fa8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites or disposable hosting. These links form a link farm, suggesting the primary purpose is to redirect users to malicious content, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://queure.ru/uplcv?utm_term=iphone+to+android+not+getting+texts PDF link annotation
    • http://ecohost.ru/pics/images/file/robijiwumexugelib.pdfIn PDF document text
    • http://pluimveebeurs.com/userfiles/file/refuvafat.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f27bfd77c9---12191605210.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16134fb8a68a7a---dubalagovudapod.pdfIn PDF document text
    • https://ms1oke.com/contents/files/9352800904.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/1e4666e496e14c3187409e5f5106f90c/tawubawidef.pdfIn PDF document text
    • https://samudra99.com/contents/files/pubumenanefivof.pdfIn PDF document text
    • https://yukkumpulgroup1.com/contents/files/bozakazulinupipas.pdfIn PDF document text
    • http://gsnursing.in/ckeditor/ckfinder/userfiles/files/87579588288.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/43824235670.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021092214465920.pdfIn PDF document text
    • http://yushendesign.com/images_fck/file/1631509778.pdfIn PDF document text
    • http://mrukseo.pl/userfiles/file/soxali.pdfIn PDF document text
    • https://www.zolmedis.lt/ckfinder/userfiles/files/lekudanepivobifap.pdfIn PDF document text
    • http://2018.letnifestiwal.pl/ckfinder/userfiles/files/nunaruni.pdfIn PDF document text
    • http://noithatdangcap.vn/app/webroot/uploads/files/nujelupawatunigukuwarezuk.pdfIn PDF document text
    • http://articolo17.it/siti/usr/foto/files/wekaturej.pdfIn PDF document text
    • http://vwtint.com/userData/board/file/savuguvorovinalasokamun.pdfIn PDF document text
    • http://w3-japan.com/js/upload/files/77089523899.pdfIn PDF document text
    • http://balletpanov.com/uploads/files/tapuxawili.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/50585304267.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/ef4082d22b84d865597f5f19b7be01e6/kudaziwalaginabasunasa.pdfIn PDF document text
    • http://vlajkylevne.cz/UserFiles/File/14336948070.pdfIn PDF document text
    • https://sunnyrosesschool.com/userfiles/file/19144517477.pdfIn PDF document text
    • http://erh-hu.com/userfiles/file/23587556741.pdfIn PDF document text
    • https://medgal.pl/admin/ckfinder/userfiles/files/nejofozu.pdfIn PDF document text
    • 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_off0000bda4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d5b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B6 16424 bytes
SHA-256: e62bc48085aa47dea8b8a3e50590d4a4aab6479244bc8629a1fb90a4f4dcc043
font_02_sfnt_off0000ff84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF84 10680 bytes
SHA-256: d382b571b3f1da64bd87f4665af5112b28410b9a991a91c013f2b67791dde5c8