Malicious PDF — malware analysis report

Static analysis result for SHA-256 f05845f9b7518fd4…

MALICIOUS

PDF

77.8 KB Created: 2021-09-06 01:58:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f928c24723a9e63d6dec76e9db82fc76 SHA-1: 40961fbe5e7994d93bfe14b05c67898267954c3d SHA-256: f05845f9b7518fd49ab308c953c6e6047ac2906775a08ec25d44806b40173267
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the structure and URL patterns are consistent with a link farm designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://francescofesta.it/userfiles/files/92357823911.pdf In PDF document text
    • http://tumwebthailand.com/ckfinder/userfiles/files/42258505752.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e4bce68d9da---29990103764.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/bb5062496a8de159d1c52eea6d75d2fe/70916623650.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c64e1e57f96---kuzuximupulokujivi.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb1bed957bc---26377345307.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609074d02d969---1915755237.pdfIn PDF document text
    • https://korankertas.com/contents/files/58299431049.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160727a930aaff.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b79ec84e741---94382551260.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0effaaadc---21887010687.pdfIn PDF document text
    • https://markyatirim.com/resimler/files/julukojobegugod.pdfIn PDF document text
    • http://logtech.cz/foto/Image/file/dowesemupoxunuledej.pdfIn PDF document text
    • http://kaowei.tw/image/files/20210527_162324.pdfIn PDF document text
    • http://fine-trading-knotwork.de/uploads/media/69951705193.pdfIn PDF document text
    • http://pribatu.lamilagrosaimport.com/images/files/50650065140.pdfIn PDF document text
    • http://onsijsselstein.nl/userfiles/files/85874560635.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/40n17gadhgjgtnbuiti0uvpd7g/miritafi.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/momaba.pdfIn PDF document text
    • https://namdolove.com/FileData/ckfinder/files/20210720_19F94D047560A725.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090c52b47128---tirejewujakovule.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f95507ba13---65041712890.pdfIn PDF document text
    • http://bursaceyizgelinlik.com/images_upload/files/64065847709.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/f74bd3bfd4432971bd27b683f74b093e/loxulesa.pdfIn PDF document text
    • https://consultemergingmarkets.cubsindia.com/files/ledofonuzaz.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160795800a80b2---tofimizugofijubuleb.pdfIn PDF document text
    • http://bharatandcompany.in/ckfinder/userfiles/files/xubawa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=leo+strauss+historia+de+la+filosofia+politica+pdfPDF 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_off0000c732.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC732 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF49 10668 bytes
SHA-256: 06b5f3e0aedffbdacc4cf260f26b8ed8499cb1e9c297ae8411999563fa28c259
font_02_sfnt_off0000f7d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D7 19336 bytes
SHA-256: 9045e57ce4f1d9b9659a0e69869f71d091579fd06ce3a44854a315d2969d5e10