Malicious PDF — malware analysis report

Static analysis result for SHA-256 db3bd89375eebb7b…

MALICIOUS

PDF

62.2 KB Created: 2021-06-20 01:51:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 8cbac41a4d092a719c39d8f1e372d8c3 SHA-1: 8c8f5020a0763be63a66b1173cc79c4d4a988344 SHA-256: db3bd89375eebb7b3857291ae21f7c084055a4b114cefbf3d6b4d8ddf5994c21
156 Risk Score

Malware Insights

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

The sample is a PDF file that contains numerous links to external resources. Several heuristics indicate that these links point to compromised CMS upload storage and are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad2a060fe96---keresimakojesedudulur.pdf In PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee4aba7c3e---genazaroripidovibozip.pdfIn PDF document text
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/5980810496.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7c9a6c7bdd---50972994021.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/97503435388.pdfIn PDF document text
    • http://bensonlandscape.com/editorData/file/magupexorifutomo.pdfIn PDF document text
    • http://hilimall.ae/uploads/files/tafaferipikawuneperupezad.pdfIn PDF document text
    • http://samnakthodrahassob.com/userfiles/file/jowuvomi.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a9c6fcbc69d---netalizupewamerasofefi.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/3579bb461e28fc89aa5d87c3be70e967/vatumepojabopobopubonu.pdfIn PDF document text
    • http://goodwill.pl/userfiles/file/99692915727.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/pr7da8qemnne5qs7sneu12ane3/42751743598.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/dba081ed9f53b9638b42bb44e8bad2a4/26463532441.pdfIn PDF document text
    • http://2016montemayorreunion.com/clients/e/e5/e530e98a7ee505477716bae2fe71cdef/File/44836615778.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a882000eb---58531794052.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=msp+hack+no+surveyPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB613 5220 bytes
SHA-256: d1cdee35d13121a4c1ecd617f9324ce00ff7e1aa031da15d823077755de10028
font_01_sfnt_off0000c7ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7EA 10556 bytes
SHA-256: cff4e1ce6e0cd29123f31ebd02d45fd6742830fd4cddb7627cac7ec430ad4424

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