Malicious PDF — malware analysis report

Static analysis result for SHA-256 f354336da79a669f…

MALICIOUS

PDF

69.7 KB Created: 2021-09-27 20:01:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0ccdb4010e5eb03b2612f816c4e07cf4 SHA-1: d9c3832c7bcab2a42819601f2280119860509422 SHA-256: f354336da79a669f82283e09e4e724558e7b9d57a8b0368dd4d97d99d4827c76
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 CMS upload directories or are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://nomylo.ru/uplcv?utm_term=telugu+cid+latest+episode PDF link annotation
    • https://www.studioline.ie/ckfinder/userfiles/files/8316273412.pdfIn PDF document text
    • http://szjwwj.com/userfiles/file///kejivaxilob.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/4v33aagt2t58il5nmi5kqhaiol/26263276539.pdfIn PDF document text
    • http://szjg.hu/images/file/xuxugatuteniwepofuzewizo.pdfIn PDF document text
    • http://voyagevietnamlaos.com/hinhanh/file/zugakizobeborikumefezer.pdfIn PDF document text
    • https://alkirbilaw.com/userfiles/files/wutaselodifuganu.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/29636383823.pdfIn PDF document text
    • http://srub-servis.ru/userfiles/file/87500294435.pdfIn PDF document text
    • http://datev.hu/ckfinder/userfiles/files/muvabexize.pdfIn PDF document text
    • http://thevalleytrader.com/files/75525689941.pdfIn PDF document text
    • http://peaceinsrilanka.lk/ckfinder/userfiles/files/putavojosibava.pdfIn PDF document text
    • http://liveisagenix.com/ckfinder/userfiles/files/20260840907.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/1f6cca34c5cf811d5f43d0962f59b76c/58577681261.pdfIn PDF document text
    • http://etepi.pt/js/ckfinder/userfiles/files/numobagifi.pdfIn PDF document text
    • http://opusincertum.it/userfiles/files/70408603230.pdfIn PDF document text
    • http://kriosispl.com/cote_dor_import/admin/ckfinder/userfiles/files/javetaxefabulakobufiveni.pdfIn PDF document text
    • http://hokkaido-love87.com/app/webroot/js/ckfinder/userfiles/files/88286704030.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/161434f50769f6---pivabesirukej.pdfIn PDF document text
    • http://alarmy-kamery24.pl/userfiles/file/4263636992.pdfIn PDF document text
    • https://gencshoworganizasyon.com/upload/ckfinder/files/tevexe.pdfIn PDF document text
    • https://mayphotocopydogia.com/upload/files/xepazorifi.pdfIn PDF document text
    • http://thibidi.vinadesign.info/uploads/images/files/kijupuwamotufen.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/8258467848.pdfIn PDF document text
    • http://szpitalstrzelin.pl/userfiles/files/tekukaruporisos.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_off0000b263.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB263 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA75 15188 bytes
SHA-256: 4527444d8de1cdc6548d5f427d7e65f42258036117c082109a700f9c15a19849
font_02_sfnt_off0000f13f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF13F 10548 bytes
SHA-256: 3463fcb1a4962f1625bfda1d06589472bacd3a2b55e3f4704eefc76880272937