Malicious PDF — malware analysis report

Static analysis result for SHA-256 9210bb7adf30ce46…

MALICIOUS

PDF

71.6 KB Created: 2021-09-27 21:55:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 8c19b6a6cc112fc00b2c32cb35ca96e9 SHA-1: 5dcc7c64b58bd95589c2869c8a9cae594276001e SHA-256: 9210bb7adf30ce461c0fe29ea657b7e294b20112262058c14ed0a3a9dc825a31
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, likely to obscure the final malicious destination. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with phishing lures designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://mellorymotors.ru/admin/ckfinder/userfiles/files/fasedafuxanetufelu.pdf In PDF document text
    • http://camara.acessoainformacao.org/uploads/ckfinder/files/kesapaxamefunanojaliket.pdfIn PDF document text
    • https://takipcisec.com/calisma2/files/uploads/16222397823.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614291af2d438---rekuviluxelofe.pdfIn PDF document text
    • http://cu-mbc.com/ckfinder/userfiles/files/buwazulug.pdfIn PDF document text
    • http://tentimesneedlehill.com/UPFILE/userfiles/files/lufuwibutafewopex.pdfIn PDF document text
    • https://hunghiephuylog.com/upload/files/89264717647.pdfIn PDF document text
    • https://artistaone.co/userfiles/files/83051933744.pdfIn PDF document text
    • http://guanzhuli.com/userfiles/file/33066013955.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614ba5e258e6e---48243212700.pdfIn PDF document text
    • http://prestinoequitacion.com/imagenes/upload/files/92041732061.pdfIn PDF document text
    • https://kolkatanagariksammelan.org/ckfinder/userfiles/files/taranetuminogutudadezu.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/16150c9ec61631---vewuvenewuzotabon.pdfIn PDF document text
    • http://asacnfservices.com/ckfinder/userfiles/files/wofigaremutezivu.pdfIn PDF document text
    • http://huile-de-nigelle.info/userfiles/file/zedapeseweraxe.pdfIn PDF document text
    • http://sasnowosielski.com/ckfinder/userfiles/files/movujixanafurekamivuwipil.pdfIn PDF document text
    • http://limobebe.com/userfiles/files/40006491296.pdfIn PDF document text
    • http://canissapiens.com/images/uploads/file/6608763242.pdfIn PDF document text
    • http://residenzaeden-albisola.com/userfiles/files/bozolujibixojota.pdfIn PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/xomiburup.pdfIn PDF document text
    • https://valenciamaids.com/userfiles/files/4458656696.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/69755758541.pdfIn PDF document text
    • http://npk-bypassdrr2.com/file_media/file_image/file/lugozasopasi.pdfIn PDF document text
    • https://realxenon.ru/uploads/files/47597825430.pdfIn PDF document text
    • https://banderlogclub.ru/Files/file/vosibotunetiwikibe.pdfIn PDF document text
    • https://noriupapildu.lt/ckfinder/userfiles/files/rawiru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=android+open+gps+settings+intentPDF 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_off0000b5ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5AD 10340 bytes
SHA-256: 1b24b66776fa2b4d03a1690ecc45d0e52649fab20c5c0e475f5cc56a35b38225
font_01_sfnt_off0000cce8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e4fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4FA 16308 bytes
SHA-256: 5f02a63cad604a1875639747f4618064f25bae1fc9d4904a2d89efa13be002fa