Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c27fbddfad16d78…

MALICIOUS

PDF

83.4 KB Created: 2021-09-02 15:45:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 846e16b98df34bf817a66a9f8b5d1a38 SHA-1: a17ac44e01575f31459c3868469b787688d2ebea SHA-256: 1c27fbddfad16d780b1423fccb8fd4af250c052d1ee966ea7e2fafcede0166c2
172 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. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories, presents a deceptive download button and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • 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.
  • 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://jotekonybakterium.hu/userfiles/files/2716354065.pdf In PDF document text
    • http://zetrade.cz/userfiles/file/melatif.pdfIn PDF document text
    • http://studiolaviano.it/userfiles/files/waxafijusetifuropefadiri.pdfIn PDF document text
    • http://longbienco.com/js/ckfinder/userfiles/files/jokisa.pdfIn PDF document text
    • http://ildongwire.com/userfiles/file/75951854805.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160a23917685f5---kujetivumejiz.pdfIn PDF document text
    • http://brilliantsolarpaneling.com/userfiles/file/gixediruzukebefezofur.pdfIn PDF document text
    • http://arisutour.com/ckupload/files/lasexovot.pdfIn PDF document text
    • http://cnokorea.com/userfiles/file/86487556735.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609c45c6cf213---venoturuj.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/9cdcfe6317ca91bd14b47ad8dfc73434/nuramuw.pdfIn PDF document text
    • http://www.civilhospitalpalampur.in/img/uploads/files/89634189878.pdfIn PDF document text
    • http://ingmarcofaedi.com/userfiles/files/99449198787.pdfIn PDF document text
    • https://bselink.com/userfiles/file/23689751574.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/8snfj0a2mhpjgtq9dmjr9ev0hb/60395661661.pdfIn PDF document text
    • http://mastervin.ru/files/file/vuzabalazupopojejakex.pdfIn PDF document text
    • http://faxik.ru/ckfinder/userfiles/files/pedevosukekidawatudawaz.pdfIn PDF document text
    • http://yogaschoolofkerala.com/photos/editor/files/jabeleropopenaruwub.pdfIn PDF document text
    • https://woodfur.in/userfiles/file/95305772540.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607bbd7a27455---pasowejemoripubelala.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160844e483a6da---fipinixezepugawegog.pdfIn PDF document text
    • https://alkirbilaw.com/userfiles/files/muwibomo.pdfIn PDF document text
    • https://mindspacepsytherapy.com/upload/ckfinder_temp/files/20210529143533.pdfIn PDF document text
    • http://dwhs79.com/clients/15834/File/1452964487.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=convert+pdf+to+word+to+edit+text+free+onlinePDF 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_off0000e1b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B3 10448 bytes
SHA-256: ce33b0cdf24ab683427121563dbb086181a3ee726c972d8ea3711336bf26e133
font_01_sfnt_off0000f995.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF995 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000111a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111A7 17796 bytes
SHA-256: e6c04934a7dd90d7481c46a595e2585ada61e978a9a534fcd5a2a7a1832ec57c

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