Malicious PDF — malware analysis report

Static analysis result for SHA-256 d872486bae3662b6…

MALICIOUS

PDF

56.8 KB Created: 2021-09-17 10:03:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5ec883034c836c0fef4908f96547e4c7 SHA-1: a331fd94ef241064a4f14fdf97fd90582e454e9a SHA-256: d872486bae3662b64a31124b2185b426c70eec2b3bfd1ba923b0e0e05323d8f4
154 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous other PDF files hosted on various domains, some of which are identified as compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and appears to be metadata from the wkhtmltopdf tool rather than user-readable content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6212

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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://okazdedziecko.pl/_files/Media/file/48303491619.pdf In PDF document text
    • https://farsiherbal.com/cache/fck_files/file/fefelevavisakiraboxovo.pdfIn PDF document text
    • http://hongsung114.com/files/fckeditor/file/zaxuwusubasekevavop.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/66022654109.pdfIn PDF document text
    • https://namratalakhotia.com/userfiles/files/xarixiwabogovatutazekaxad.pdfIn PDF document text
    • https://optimuselearningschool.aels.edu/learning/site/images/uploadfiles/kibupekasiba.pdfIn PDF document text
    • http://cuanhomkinhtoanthang.com/media/file/dizimawel.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613f90c6a82b6---simasunax.pdfIn PDF document text
    • https://aynadakikemalizm.com/resimler/files/2339113189.pdfIn PDF document text
    • http://automyjka.pl/automyjka.pl/userfiles/file/vonogolojotebedi.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/vuvorogopobulekumuduj.pdfIn PDF document text
    • http://teplolux72.ru/upload/file/jidatu.pdfIn PDF document text
    • http://tatugigo.com/ckfinder/userfiles/files/83785658002.pdfIn PDF document text
    • http://sladkiy-ostrov.ru/userfiles/files/nevinigegirejowi.pdfIn PDF document text
    • http://cuakeobinhduong.com/upload/files/83008925784.pdfIn PDF document text
    • http://cc-loges.com/uploads/file/xokizawotanibotepix.pdfIn PDF document text
    • https://dzido.pl/userfiles/file/20523192249.pdfIn PDF document text
    • http://urduhadith.org/survey/userfiles/files/64866190422.pdfIn PDF document text
    • http://indemo.pl/Image/files/55546938754.pdfIn PDF document text
    • http://erisalaw-chicago.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/10052690457.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161328a66749e8---23970496870.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16140c9fa07deb---55146094155.pdfIn PDF document text
    • http://lightningriskassessment.com/ci/userfiles/files/vovibasirizifobidaxaluri.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/sakidarafurogevolulera.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=beautiful+music+player+androidPDF link annotation

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