Malicious PDF — malware analysis report

Static analysis result for SHA-256 44f5b9e30c3394a6…

MALICIOUS

PDF

95.1 KB Created: 2021-09-19 05:15:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a120704e3f1d0423b0f8173ed0e7764c SHA-1: 6c7e5ec415d47954f8d8a7b59d127111df46120d SHA-256: 44f5b9e30c3394a65d875e654a75dbd18a552d5c6bffa7631401dd7bac4d89ab
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised websites 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 malware delivery. The presence of embedded JavaScript (T1059.007) suggests the document is actively trying to execute code to facilitate these malicious redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://drafthe.ru/uplcv?utm_term=final+fantasy+tactics+psp+rom PDF link annotation
    • http://rainternacional.com/userfiles/file/gujezalij.pdfIn PDF document text
    • http://djapm.com/userfiles/file/52489907269.pdfIn PDF document text
    • http://bebaldebaran.eu/userfiles/files/kajorotanubagomux.pdfIn PDF document text
    • http://etepi.pt/js/ckfinder/userfiles/files/58913382108.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/161390aa827738---xamuxup.pdfIn PDF document text
    • http://nhadephoanhao.vn/upload/ckupload/files/44536381639.pdfIn PDF document text
    • http://aedelsur.com/contenido/files/xexodozo.pdfIn PDF document text
    • https://mayxaydunghoangphuc.com/userfiles/files/48471881066.pdfIn PDF document text
    • http://donahoelawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/visedobozasivopusopow.pdfIn PDF document text
    • https://dintek.eu/uploads/file/duzarumodugonevofapowisi.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/76036075796.pdfIn PDF document text
    • http://radio-salsa.fr/php/rs/filesupload/file/15833340478.pdfIn PDF document text
    • http://houstontca.org/Content/uploads/files/kegexuzibapepi.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/rdhaaiegcqjr09pvvtnts7fa84/36829113925.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/kowunubug.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16131a87e80641---19418376438.pdfIn PDF document text
    • https://luminex.pl/upload/file/58332645651.pdfIn PDF document text
    • https://akvaguru.hu/user/file/71264873348.pdfIn PDF document text
    • https://delaneyllc.com/ckfinder/userfiles/files/34111030641.pdfIn PDF document text
    • https://securitydm.com/slicice/file/manixuvabuf.pdfIn PDF document text
    • http://bualuang101.com/backoffice/upload/files/kedomof.pdfIn PDF document text
    • http://lovec.bg/root/ckfinder/userfiles/files/37943204689.pdfIn PDF document text
    • http://isystemlab.com/admin/ckfinder/userfiles/files/66478928416.pdfIn PDF document text
    • http://infunplastic.com/d/files/kamerixirezejejinile.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614696f12828a---gajun.pdfIn PDF document text
    • https://confidence-ist.mktechsol.com/ckfinder/userfiles/files/vanebo.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_off00010ae5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE5 19816 bytes
SHA-256: 2ddc8ee47e6aa13b5d86a7f6104288363e73ed449a285511171db69e811f2dcb
font_01_sfnt_off00013eb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EB3 10600 bytes
SHA-256: 1ca4ab67b109b9eeaeb9610895ac95cbed8fb2d57649abc39cb06a21821b0197
font_02_sfnt_off000156ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1