Malicious PDF — malware analysis report

Static analysis result for SHA-256 b69573b47f260d72…

MALICIOUS

PDF

81.2 KB Created: 2021-09-16 00:23:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: acde571a0549e0614b5d55e9da06482c SHA-1: c6d902c831a6962b96fbb7633e9ab9ccb85f00ec SHA-256: b69573b47f260d721b3ed84199f61a923663280ebd0c6e3a7b7d56f5ddcf2e6a
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which point to link farms on potentially compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 http://bakersfield.thepokeluau.com/uploads/files/nonuzulofoxevetesoziw.pdf In PDF document text
    • http://eprdel.cz/userfiles/file/bixuzi.pdfIn PDF document text
    • http://www.stadion-zarya.ru/ckfinder/userfiles/files/56171805883.pdfIn PDF document text
    • http://grupophi.es/uploads/files/vokolaxeperuvaleno.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/gasux.pdfIn PDF document text
    • http://struttur-arch.it/userfiles/files/32791499084.pdfIn PDF document text
    • http://preciz.com/uploads/wysiwyg/files/romovotugit.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/dvceils7mr1q2tdgu0e3ni2qbb/siwojatisiv.pdfIn PDF document text
    • https://bio86.net/userfiles/fichiers/pizosugum.pdfIn PDF document text
    • https://littleitalypizzany.com/nbloom/fckuploads/file/72265890037.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/46983609316.pdfIn PDF document text
    • http://burbank.kopanramen.com/uploads/files/lozolo.pdfIn PDF document text
    • http://jingluo.net/uploadfiles/files/navodejenusonagumaju.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/gozelako.pdfIn PDF document text
    • https://www.tahitotfaluovodak.hu/ckfinder/userfiles/files/kukukekivimeferek.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7f47823c4---29766131032.pdfIn PDF document text
    • http://madiagranitosilano.it/userfiles/files/bosufotaxejeriget.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613c4ba1b89cf---88494017197.pdfIn PDF document text
    • http://about-dogs.ru/upload/file/18959634838.pdfIn PDF document text
    • http://parejalecaros.com/adjunto/upload/fck/files/taladinawikoludofudeliv.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/vorotegifakajuwufuxelu.pdfIn PDF document text
    • https://pavillonwohlen.ch/userfiles/files/sasubajajefel.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc68bb4189---57752187564.pdfIn PDF document text
    • http://aluminial.pnh.pt/js/ckfinder/userfiles/files/tubedokuvofurepakunutad.pdfIn PDF document text
    • https://www.singaporemedicalclinic.com/ckfinder/userfiles/files/nedel.pdfIn PDF document text
    • https://zaragozadenoche.es/upload/files/jazax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=prometheus+greek+godPDF 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_off0000dc23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC23 16912 bytes
SHA-256: 34df50f2d5a87d1ae5e82ed74fefa96eccad79ff29219da416bab468ee92a041
font_01_sfnt_off0001074f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1074F 10484 bytes
SHA-256: 28f5745b9f99aee5fa09b38ab0b077b1f8c5676dd8e42446686bffaccd82c98d
font_02_sfnt_off00011efc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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