Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3af7c29972f3f5a…

MALICIOUS

PDF

79.6 KB Created: 2021-09-20 02:01:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f919174b0bc2f9cf198595d2d1a894c4 SHA-1: 41f71561d455fdc76e49f610e1378032153c42bd SHA-256: f3af7c29972f3f5a350d3bafc2f8454937794768ab984684a281ea3032746941
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to other PDF files, many hosted on domains associated with compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. While no scripts were directly extracted, the structure suggests a link farm designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://crysiq.ru/uplcv?utm_term=tabla+de+integrales+completa+pdf PDF link annotation
    • http://colafranceschi.it/userfiles/files/famuga.pdfIn PDF document text
    • https://aucordechasse.fr/vosImages/vimivolasanurutiba.pdfIn PDF document text
    • http://vetranhtuong.info/luutru/files/kesifudusesivog.pdfIn PDF document text
    • http://poliinc.com/upload/files/kutevikokaridotare.pdfIn PDF document text
    • https://sfeerweter.nl/userfiles/files/zuzupugoro.pdfIn PDF document text
    • http://colafranceschi.it/userfiles/files/vogidurefiki.pdfIn PDF document text
    • https://weilaimachinery.com/userfiles/files/vonugopojaxatafa.pdfIn PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/80335870437.pdfIn PDF document text
    • http://zygzak.eu/foto_dane/wysiwyg/File/wirezozam.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/161470ae8269a3---kijam.pdfIn PDF document text
    • http://cnhhgj.com/upfiles/userfiles/file/kiwelip.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a867698aca---vekowo.pdfIn PDF document text
    • http://carsonpokebar.com/uploads/files/toxesigumojur.pdfIn PDF document text
    • http://bezpiecznamlodosc.org/files/file/19531801893.pdfIn PDF document text
    • http://www.udelimpa.es/ckfinder/userfiles/files/zuxojinibi.pdfIn PDF document text
    • http://www.tecnobor.es/ckfinder/userfiles/files/75863591777.pdfIn PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/40078316897.pdfIn PDF document text
    • http://aapltd.net/userfiles/file/vajijikavepafofakub.pdfIn PDF document text
    • http://world-housing.jp/ckfinder/userfiles/files/1385673097.pdfIn PDF document text
    • http://chaputlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/barasofalofomalejifaken.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/161351de9f20a9---kivojalimowoxexago.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/99757278428.pdfIn PDF document text
    • https://regenerateacademy.com/file/90152265501.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/6fcf7e72dca2ffe56612e1aa947d3f6a/41896814888.pdfIn PDF document text
    • http://photou.cc/ckfinder/userfiles/files/niruxisuwipovefi.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_off0000cacd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCACD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e2df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2DF 20252 bytes
SHA-256: 866fb2c81fcca8dcc1aeb04d38f7502004e236aeae0d3b18bc1f33f03a351b9c
font_02_sfnt_off0001173a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1173A 11064 bytes
SHA-256: 433b3e11bb7dcd2de90ff31d106b805f5b8f13b68a6d276625b45ad913d308e2

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