Malicious PDF — malware analysis report

Static analysis result for SHA-256 1117792f748e50a8…

MALICIOUS

PDF

132.2 KB Created: 2021-08-14 14:23:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 7c8b998e097027b86ecd76b69abc4aac SHA-1: b0466ac7f6fc4a4fdb9b52a6236d5767dee6dc3e SHA-256: 1117792f748e50a8d2472f3f53026111cb52e7eaade0f92e0ada4653284d4c1c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. The PDF contains numerous links to external websites, many of which appear to be compromised or disposable hosting, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics strongly indicate this PDF is designed to redirect users to malicious content or facilitate malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://nomylo.ru/uplcv?utm_term=monopoly+city+spielanleitung+pdf+deutsch PDF link annotation
    • http://fujavietnam.com/images/Download/98807629049.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/dovusexatewisur.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1609a08e1a374d---xolumutof.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d23dff01a4---fefijulowenirasajemigir.pdfIn PDF document text
    • https://turbooto.vn/upload/files/fudewoliwisegepifipub.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/guzuvulafikeduzazonasu.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/31343698205.pdfIn PDF document text
    • http://haworthclassof73.com/clients/73472/File/80275788616.pdfIn PDF document text
    • http://regimhotelierbucuresti.com/images/userfiles/37741508090.pdfIn PDF document text
    • http://inse.us/uploads/images//files/77168492499.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccfe8bd2de---63951547231.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/d83c365b972d394b6c520e34b626371e/jotogazinovojavilo.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/8622266a08bad59ca2f8b901d2e35f8b/rinamudugisiwaxosuwaje.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/c2b13f8d2b08b8e44491f25530a8b265/zipotot.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/0b6ed8f7fb478d4dc43580a275d7eff1/13719070174.pdfIn PDF document text
    • https://sca-eagleegg5k.com/ckfinder/triplebuserfiles/file/vigedi.pdfIn PDF document text
    • http://ottuk-e.org/userData/board/file/luxibijuvotojawusali.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/0959d6f3c8842a2c16534b4899680cf8/59800192604.pdfIn PDF document text
    • https://salubrismd.com/wp-content/plugins/super-forms/uploads/php/files/1172eb1bcd2b8125c26387d3cf483b52/tufurubasafezijukum.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/86886259666.pdfIn PDF document text
    • https://ibliberia.com/ckfinder/userfiles/files/kimunufur.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/161078b3eb8d43---54572360990.pdfIn PDF document text
    • http://hiro-seiko.com/upload/files/wabesapapugoderuzutadiziv.pdfIn PDF document text
    • http://mujuerp.com/uploads/ckeditor/files/20210612220412.pdfIn PDF document text
    • https://pagodatalk.com/_UploadFile/Images/file/99607977226.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_off00019b70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19B70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001b382.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B382 21284 bytes
SHA-256: 4b8df51a94d32669bf456d980c6d3796f0369bd30bf8cbb6b402a9205b0442f4
font_02_sfnt_off0001e94c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E94C 11004 bytes
SHA-256: 3905cfe3df2c39667675dd73d95500e99af747556cbde22c91ba8d8c5fcc737d