Malicious PDF — malware analysis report

Static analysis result for SHA-256 dff735692af97061…

MALICIOUS

PDF

94.3 KB Created: 2021-08-15 15:27:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 57cfc015243ecb854d0c7f1ec5636e4e SHA-1: 4aa2a6563119954ae4deaef3bebe035a2236f810 SHA-256: dff735692af9706102da792b556c9e347d1a9fdc1c2333451faf64d163a5c0f4
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=skin+changer+fortnite+2020+ps4 PDF link annotation
    • https://monographie.com/ckfinder/userfiles/files/waxadabamivuro.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b74655994fa---pupuxaluzotigozapetolovap.pdfIn PDF document text
    • https://eprobatdz.com/ckfinder/userfiles/files/20467971397.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/d9e12bedd70c4661dc4cac08732531ff/69516048856.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/ginekoruzewogezajojim.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/52486195323.pdfIn PDF document text
    • http://podwierzba.eu/ckfinder/userfiles/files/nixapawapofulafijem.pdfIn PDF document text
    • https://vnsteeldetailing.com/UserFiles/files/5989932397.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/289e562ba13ebe883782172741fce717/sikurodudopowaxujonoge.pdfIn PDF document text
    • https://vico-domrep.com/ckfinder/userfiles/files/gowofikunulowumuwapede.pdfIn PDF document text
    • http://patp1ryb.ru/media/file/64375671341.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ddf19c73b5---xepuzenipuxomemig.pdfIn PDF document text
    • https://lenaoyunlar.com/calisma2/files/uploads/mefepetomazukitideta.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/676bf91d8252ffbaa8e0a57005dddef3/16598521739.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d4a41de51ff---62214267829.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/17438268983.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/46792266889.pdfIn PDF document text
    • http://archiprojektai.lt/app/webroot/uploads/userfiles/files/92181057708.pdfIn PDF document text
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/84b7a511e7223799950ef28c126ea2df/xivotasazuxoziwa.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160824f2ae4f99---niturizivimasuledorevomap.pdfIn PDF document text
    • http://myhomeinparis.com/userfiles/files/nejefunulokiwevikijuzerur.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/xesit.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eeab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAB 18196 bytes
SHA-256: 3b415ad330da93ecbee48c260afa32624f6de1540abcf4989afa53e49e0abf9b
font_01_sfnt_off00010adf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ADF 17164 bytes
SHA-256: a68eacc94a484915263d3a399c9fba812857cbfa151409ae09728d0591283236
font_02_sfnt_off000137ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014fc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FC4 11200 bytes
SHA-256: c971507b23cc96aaf68864947894e6737e83d7e9bca241246cf8459ef42d13ff

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