Malicious PDF — malware analysis report

Static analysis result for SHA-256 9db499b1ef46a03c…

MALICIOUS

PDF

89.6 KB Created: 2021-09-18 23:18:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 895f53de54f82ebed6452c6120205fd7 SHA-1: a875cc567646326e6c99562f054d17ac26e1269e SHA-256: 9db499b1ef46a03cc40a0e2ca705a0045341a8f7c368aa591098957c8cc605d5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. It also features a large number of external URLs, many hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://chcial.ru/uplcv?utm_term=react+native+alert+android PDF link annotation
    • http://world-spa-resorts.com/dok/zijude.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/161451c0f10a32---netifevav.pdfIn PDF document text
    • http://stopguepes72.fr/userfiles/file/jikaladulajuzoralop.pdfIn PDF document text
    • https://birsamundapark.in/userfiles/files/xuzije.pdfIn PDF document text
    • https://webkapper.nl/ckfinder/userfiles/files/pukotowomosuf.pdfIn PDF document text
    • http://supair-lux.hu/ckfinder/userfiles/files/laxujaretanubulud.pdfIn PDF document text
    • http://agedwedfjtj.pretty-match.com/upload/files/52867692174.pdfIn PDF document text
    • http://landpas.pl/upload/file/8334472328.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/sljcnnpuf94c3alf93seil19vg/23313449739.pdfIn PDF document text
    • https://egokituz.org/files/galeria/files/90377483526.pdfIn PDF document text
    • http://investin-khj.ir/ckfinder/userfiles/files/domegetozite.pdfIn PDF document text
    • http://studiorestagno.eu/userfiles/files/kakutuworu.pdfIn PDF document text
    • https://feniks9.ru/ckfinder/userfiles/files/basaline.pdfIn PDF document text
    • https://gimenezricarte-deltabogados.com/ckfinder/userfiles/files/47103195949.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613194fb68a5e---87848590716.pdfIn PDF document text
    • http://gold-carsales.com/js/upload/files/sofufu.pdfIn PDF document text
    • http://olivetheater.com/userData/board/file/gokezavefoxitavavuk.pdfIn PDF document text
    • https://laatuwhuisweerstralen.nl/upload/file/fitaximuve.pdfIn PDF document text
    • http://phamtrangia.site/upload/files/40654850528.pdfIn PDF document text
    • http://nhakhoasaigonkimcuong.com/uploads/images/files/89640500860.pdfIn PDF document text
    • https://gulfcans.com/home/madarmun/public_html/gulfcans/images/bulk_images/files/43329332068.pdfIn PDF document text
    • https://globalcircle.club/userfiles/file/52382854599.pdfIn PDF document text
    • https://partroyfuneralhome.com/partroy/assets/file/gumigamoditafed.pdfIn PDF document text
    • https://universitecentrale.net/uploads/FCK_files/file/risukedarepekufazodo.pdfIn PDF document text
    • http://e1pl2.nazwa.pl/busy/fotki/file/91898172052.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_off0000f6e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010ef8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF8 10308 bytes
SHA-256: 2960f8cfa37e99f52f92f98a81f24e553d4d6d20c3a87a53162d76b2f95e0128
font_02_sfnt_off0001264e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1264E 19136 bytes
SHA-256: ea8ffddaa1f8797a43ba906c6bcfdc8fffe2e281ff063922a66b41c890ce20c4

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