Malicious PDF — malware analysis report

Static analysis result for SHA-256 b331ed45d91145a6…

MALICIOUS

PDF

71.3 KB Created: 2021-09-18 08:32:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c542c2b6932debe186d613610e0f6397 SHA-1: 6f84589a01403a2d63f9244a345a782f8c09b66a SHA-256: b331ed45d91145a68a3533964b6f642e3c2c47609786035916126f7a53fd9599
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://fsgzb.com/upfolder/e/files/20210910050755.pdf In PDF document text
    • http://talleresjpg.es/img/file/61794656192.pdfIn PDF document text
    • https://ist-lb1.istanajp.com/contents/files/72097764340.pdfIn PDF document text
    • http://mprime.net/ckfinder/userfiles/files/85117792935.pdfIn PDF document text
    • http://geobigoni.it/userfiles/files/458155208.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/cgbgsuplnctligp7h76e57443m/dofobum.pdfIn PDF document text
    • http://intertexmedical.com/userfiles/files/banakopaxuxivo.pdfIn PDF document text
    • http://campbellelectronics.com/uploads/13944268112.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161314748f3d5e---98267404312.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa5efea685---xuvonenobejejafor.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/gebuve.pdfIn PDF document text
    • http://fcraregistration.com/UploadedData/file/10551819945.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/39385025770.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/ragadetenizuxadalasi.pdfIn PDF document text
    • http://el-system.jp/uploads/2012/files/menuwezeji.pdfIn PDF document text
    • http://monikaknoblochova.com/userfiles/file/josan.pdfIn PDF document text
    • http://sandsflooring.co.uk/ckfinder/userfiles/files/jekutatukuvosexis.pdfIn PDF document text
    • http://efrex.cz/files/file/fowidof.pdfIn PDF document text
    • https://elmaga.lt/components/com_mijoshop/opencart/image/data/files/kelowofebaronamomidux.pdfIn PDF document text
    • https://xuantruongtech.com/images/ckeditor/files/94703347604.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/xumeze.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/68kulut2v5lmo2abfsu55uigc0/dikitejemijoderaxubari.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=watch+online+jinde+meriye+full+moviePDF link annotation
    • https://www.posluh.hr/ckfinder/userfiles/files/lokasi.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_off0000b342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB342 10976 bytes
SHA-256: 217f4ea0cb7fb963456c04b2b13fb8181780167568cad884d5b71de4b570d044
font_01_sfnt_off0000cc84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e496.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE496 16840 bytes
SHA-256: aa4045e050584d5562df98ec108849dda0686f96f96884676eccb9df2a1be296

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