Malicious PDF — malware analysis report

Static analysis result for SHA-256 51dfb13c23e17263…

MALICIOUS

PDF

76.9 KB Created: 2021-09-16 13:42:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 91ac229e6e890b888e53ab551b0b474e SHA-1: becad523125cbbbaa9db91a2a56cd3dd1f13a37d SHA-256: 51dfb13c23e1726339be7a6536aa7ba5ac955c69cf563706d9d87d79ea025fd7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised websites or disposable hosting, forming a link farm. The primary purpose appears to be redirecting users to external malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://pistant.ru/uplcv?utm_term=filmywap+black+panther PDF link annotation
    • https://penzion-pod-rozhlednou.cz/img/file/serivawawilemiv.pdfIn PDF document text
    • http://www.halpellet.hu/userfiles/files/87914639642.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413910924f9---2212393447.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/dbfbe9bce790da49f0d0207bfc9aa1ee/duzaxovukowesimexon.pdfIn PDF document text
    • http://nakloboucku.cz/uploaded/file/tepopitobe.pdfIn PDF document text
    • https://hongming-eco.com/userfiles/file/69196562171.pdfIn PDF document text
    • http://gelinyuanyi.com/upload_fck/file/2021-9-4/20210904145254291219.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/27833214959.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/sixufuwedej.pdfIn PDF document text
    • https://j26clean.com/upload/files/ronizefowumesom.pdfIn PDF document text
    • http://novichiha.ru/pic/file/gigoratol.pdfIn PDF document text
    • http://aitrans.org/UploadFile/file/F1202109161705458555.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd339b0503---6885096286.pdfIn PDF document text
    • http://janaturismointegrato.com/uploads/file/mudefi.pdfIn PDF document text
    • https://bcm.es/files/galeria/files/nonikiwepaladitinilixam.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161423da570822---getopekiresobugo.pdfIn PDF document text
    • https://floridagreatescape.com/media/file/piwenubavuwa.pdfIn PDF document text
    • https://cultureresortpokhara.com/assets/userfiles/files/48659392813.pdfIn PDF document text
    • https://hgb.se/filer/file/15213738239.pdfIn PDF document text
    • http://www.ppk-kp3k.kkp.go.id/ver2/extra/ckfinder/core/connector/php/media/ckfinder/files/paretuma.pdfIn PDF document text
    • http://familiegravesen.dk/ckfinder/userfiles/files/29558442294.pdfIn PDF document text
    • https://kingcarmotorista.net/uploads/files/86789665981.pdfIn PDF document text
    • https://sklep-pinokio.pl/web/uploads/files/50350862350.pdfIn PDF document text
    • https://trongtrucsolution.com/uploads/files/zanupuragadudadebekogeno.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_off0000ca3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e24f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE24F 16972 bytes
SHA-256: 9caad3c5ae085456f7e67b9e21f59795450d5fe317c82d6d520c98b121cc4f91
font_02_sfnt_off00010daa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DAA 10760 bytes
SHA-256: dd777bd4258571e2c62d0ae425fdabf84c9fc3fbaad8fb9d220aa2a4d8109cf0