Malicious PDF — malware analysis report

Static analysis result for SHA-256 1115bde718a9bbc3…

MALICIOUS

PDF

87.8 KB Created: 2021-09-19 02:15:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 8f91df38b9b56296d709c7188dcb3811 SHA-1: f97826bef7f9cee2b6e2fd324c924c390747cf39 SHA-256: 1115bde718a9bbc30ac012e01c8210af26d83ebeb4fb86749bd151693f895b6b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The presence of embedded JavaScript and ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests a malicious intent, likely to facilitate phishing or download further malicious content. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://medvor.ru/uplcv?utm_term=the+city+of+ember+read+online PDF link annotation
    • https://transmar.biz/ckfinder/userfiles/files/47410883778.pdfIn PDF document text
    • http://saeronbio.com/userData/board/file/99255189265.pdfIn PDF document text
    • http://esebtekstil.com/resimler/files/rajanogovetikax.pdfIn PDF document text
    • https://plantbiochem.com/ckfinder/userfiles/files/89506989750.pdfIn PDF document text
    • http://radioevangilereal.com/assets/ckfinder/core/connector/php/uploads/files/tadosiwobog.pdfIn PDF document text
    • https://guenangequitation.fr/www/site/js/ckfinder/userfiles/files/tonawizibalaxipalixib.pdfIn PDF document text
    • http://propertiesforrent.com/userfiles/file///64440775070.pdfIn PDF document text
    • https://pristineleather.com/userfiles/file/17214986428.pdfIn PDF document text
    • http://lawfirm.vn/MINH/user_files/file/sofib.pdfIn PDF document text
    • http://zoldjogsi.hu/uploads/files/15623742149.pdfIn PDF document text
    • http://crmrealty360degree.in/ci/userfiles/files/talimumin.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/piloj.pdfIn PDF document text
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/47399866351.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/3654722535.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135b0e8657fc---tijosiwiwuwukolozut.pdfIn PDF document text
    • https://gilboamedia.com/userfiles/file/77179627607.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/9bc7d40f8095316ce8cc89be47698fed/23882608153.pdfIn PDF document text
    • https://kabelkyaobuv.sk/editor_uploads/files/26115080999.pdfIn PDF document text
    • http://bangiyaparishadtoronto.ca/bpt/editor/uploadfiles/siwelanop.pdfIn PDF document text
    • http://spostojow.pl/userfiles/file/6159293221.pdfIn PDF document text
    • http://maymaygiaydachidang.com/upload/files/misap.pdfIn PDF document text
    • http://whatcanidoforyou.eu/publish/file/gitejejikulilomivelax.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/161417504632c6---24253676691.pdfIn PDF document text
    • http://lexen.ca/userfiles/files/22228007728.pdfIn PDF document text
    • http://quetthe.com/upload/files/74311035106.pdfIn PDF document text
    • 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_off0000eff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF1 18676 bytes
SHA-256: 638f73dba5740fd58a0395bcca63d3b02b0ab66761e4322385680d7c3c9ee3a4
font_01_sfnt_off00012040.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12040 10792 bytes
SHA-256: 3ad920471c628ccca3aff1ca31effce5ce2bd0ad7a962a3f13e72b425feac4fc
font_02_sfnt_off000138ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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