Malicious PDF — malware analysis report

Static analysis result for SHA-256 cedf216d7bfab9b3…

MALICIOUS

PDF

72.0 KB Created: 2021-09-22 10:52:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4cfe89b693e002d26b577c95fc8ef1b9 SHA-1: 2d8f1de881ada2a4e02fed16a0df2bfc075a04d1 SHA-256: cedf216d7bfab9b3637c7e11650d9eb8ed6d8d2d616ebfb44d51a69370e9fecc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with malware distribution or phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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
  • 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://queure.ru/uplcv?utm_term=gta+san+andreas+cleo+free+download PDF link annotation
    • http://podolsk-kondicionery.ru/upload_picture/file/pilelalog.pdfIn PDF document text
    • https://pannonfinanz.eu/editor_up/xesavotaxodira.pdfIn PDF document text
    • http://righetti-ticozzi.it/userfiles/files/39138703729.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/zozatog.pdfIn PDF document text
    • http://gima.ge/admin/ckeditor/ckfinder/userfiles/files/85429495948.pdfIn PDF document text
    • http://jmyhship.com/uploadfile/files/difuwaxekada.pdfIn PDF document text
    • http://medicaldistri.com/ckfinder_files/files/kukuvetujinovexefilulev.pdfIn PDF document text
    • http://mamnonhieutrung.edu.vn/ckfinder/userfiles/files/desuwiginerevaze.pdfIn PDF document text
    • http://ksklinika.ru/ckfinder/userfiles/files/jizefosezikafuvi.pdfIn PDF document text
    • https://christianschoch.ch/userfiles/file/rujuzoraburojumedo.pdfIn PDF document text
    • http://cieplej.pl/imgturysta/file/73162606629.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613aae50666d8---debufagevanulawaxitizogar.pdfIn PDF document text
    • https://nibrasimansch.com/userfiles/files/xusibeduwonalexoti.pdfIn PDF document text
    • http://stmrcstvm.com/userfiles/file/vurepuwafo.pdfIn PDF document text
    • http://orderleesushi.com/uploads/files/34697264373.pdfIn PDF document text
    • http://a2kat.ru/userfiles/file/kukebawakomafigofofeka.pdfIn PDF document text
    • https://mps-india.com/userfiles/files/29006541980.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e24ae80fc1---26157704332.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/hs9ul1bq4tut0atnjs9l5qg203/kisutulikomemi.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/raxuxuxekapeg.pdfIn PDF document text
    • http://insei.eu/userfiles/files/wotakoxakosolatowuka.pdfIn PDF document text
    • http://evergladesharvesting.com/ckfinder/userfiles/files/suremaxova.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135603537df5---pimegumizesaxajalujob.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_off0000b55c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB55C 10500 bytes
SHA-256: 6540c40daedc710ee4f25651ae18f7a89b499cd86006a4f5c8681265323dd081
font_01_sfnt_off0000cd76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD76 17500 bytes
SHA-256: 70413e2f2a273723852ec5855288e53b8fec470e298bc4e6fe2d674f3f4c2094
font_02_sfnt_off0000fa40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1