Malicious PDF — malware analysis report

Static analysis result for SHA-256 d331508b7a447389…

MALICIOUS

PDF

79.5 KB Created: 2021-09-04 10:44:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 3c95900cef11c41ec37927318d49e9b0 SHA-1: 8dd03eec003e25001359d2fc5cf057a6f4c04367 SHA-256: d331508b7a447389c91c43f30bf576871c724fcf7821d49ada9c13032a761209
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://atlastoursntravels.com/userfiles/file/16973789085.pdf In PDF document text
    • http://promador.pl/userfiles/file/musonegafupelegati.pdfIn PDF document text
    • https://xn--bren-mgenwil-gcbf.ch/sites/default/files/fck-uploads/file/11732674723.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/varavepusededenapuxa.pdfIn PDF document text
    • http://foodchemsino.com/d/files/volux.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/mdhpn6a0p7bi23tt4qfit635p4/bajotulegamumuf.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160944087050a6---77655452572.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/021632311e140edb0336c4fb24c216b0/terujaluxijox.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c09d7410bda---81733373261.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610e0764f2882---toxovaje.pdfIn PDF document text
    • http://sladkiy-ostrov.ru/userfiles/files/78625643836.pdfIn PDF document text
    • http://michardardillier.com/ckfinder/userfiles/files/72925980291.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210730235636111.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc71e9bacc2---81884995686.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/q34bl2v2mrb3ulgs8m2fq52pca/firumuwoxomonegewibixo.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/53506482139.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608204c51dbd9---37196214676.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/gefufivurelazudomopuk.pdfIn PDF document text
    • http://land89.com/ckupload/files/38866667042.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16090f81eda7c6---zulilutaxiwifek.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/aplhtg6p9kpoum9eqiber4gphi/kevoseb.pdfIn PDF document text
    • https://led7.ru/file/mowojuwejibifagifavunifi.pdfIn PDF document text
    • http://miyisz.com/mingyi/images/userfiles/file/nijukobadewodadu.pdfIn PDF document text
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/2ef28e05ca26857df7d29e197d8e3d50/pasifasijovojas.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/luzewaluzama.pdfIn PDF document text
    • http://houstontca.org/Content/uploads/files/vopiwuleraduzepazipomiv.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad14cefb41---barijipusupo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=prefixes+and+suffixes+exercises+advanced+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_off0000d26b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD26B 17712 bytes
SHA-256: 37758e5726bba1ed9a57fc4b9d15f3c042e9bbe27d15aea08a37a2cdbc3fd845
font_01_sfnt_off0000ff34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF34 10620 bytes
SHA-256: b100fe81fc61e612526e617a378ebc38d205817f1095a425ddecd8fd2d7a14cd
font_02_sfnt_off000117a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1