Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9d103cfc0d48dcd…

MALICIOUS

PDF

204.2 KB Created: 2021-07-18 12:23:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c3312496c3a39d65ea33cafd5bda76d8 SHA-1: 913259f97cd1ab963ba3c0cc9fabfce5e08b2e3c SHA-256: b9d103cfc0d48dcdbd71566275c50a030a808554c70b2925dd5d96f30c7c8e66
144 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains malformed streams and points to multiple compromised WordPress sites hosting PDF files, indicating a phishing or malware distribution campaign. The presence of embedded JavaScript, though not fully analyzed due to obfuscation, suggests it is used to execute malicious actions, likely downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8661

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://0900107678.com/upload/file/64882306633.pdf In PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/96091804495d245a62c233239594c4c8/niduvanuturomupatuteru.pdfIn PDF document text
    • http://huron81reunion.com/clients/f/fe/feec28e48c841af8be4ad6373737a022/File/39227263594.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160b9f557baf9b---bepurowin.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/005a95425e385e64d02f2f3d660bc47e/5339173294.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/8e8df130bca8829a2f86fd7b93fdf81b/nusafewuxofikiko.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/vufupowojedejubixowesere.pdfIn PDF document text
    • http://flooroverstock.com/admin/userfiles/file/9400866105.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6af781212---xosalej.pdfIn PDF document text
    • http://brmxn.com/userfiles/file/20210619034239_8yfgtp.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b595ff0439a---30850455999.pdfIn PDF document text
    • https://qualitymattressfactory.com/admin/userfiles/file/90651149823.pdfIn PDF document text
    • http://biomassasia.net/data_ed/userfiles/file/3396902670.pdfIn PDF document text
    • http://alfonsoguiggiarchitetto.it/userfiles/files/danotavewelezapizatijitow.pdfIn PDF document text
    • http://martom24.pl/martom/userfiles/file/6330746500.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/6ff7aa4052333e5fa5a045e55b9c791d/fotusiweruzone.pdfIn PDF document text
    • http://exoticland.bg/upload/files/files/vowopos.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/47c780f0baa402c0f4ac11b9f01d35ec/kafixuvixizupolufavuwofig.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/naposonubepu.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5d72db300b---lavirikebufagafitarode.pdfIn PDF document text
    • http://rghsalumni.com/clients/82979/File/10914592858.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a45a3aa993c---89733973072.pdfIn PDF document text
    • http://pro-elec.ru/ckfinder/userfiles/files/5160963258.pdfIn PDF document text
    • http://xn--szabowski-tub.pl/userfiles/file/45429532651.pdfIn PDF document text
    • https://braindevelopmentmaps.org/userfiles/files/kotafunenu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=ring+of+sacrifice+ds3PDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00030704.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30704 17496 bytes
SHA-256: 0603f1943ab53f7f002ed51b98b174f2b2343a4376ae7ddb22d6b43383899c1c

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