Malicious PDF — malware analysis report

Static analysis result for SHA-256 120324373a0461ec…

MALICIOUS

PDF

88.9 KB Created: 2021-07-02 18:49:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 8d3e45e9bae20791e6ce1269f1e77929 SHA-1: 59ddd407a89756baf0732c253d7f65405250b982 SHA-256: 120324373a0461ecb7e700d80e05a818980b9036e4e91841f8d5885e74a090cf
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs that point to compromised WordPress sites, likely serving as a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is unreadable, but the heuristic firings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://irlanc.ru/uplcv?utm_term=reformation+crossword+puzzle+answers PDF link annotation
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/8cb7a4e7d9141de3dbc4f994c65a95e4/jogebuke.pdfIn PDF document text
    • http://zae.me/datafiles/file/80319910473.pdfIn PDF document text
    • http://ixtvs.de/_upload_bilder/_filemanager/file/kidilinad.pdfIn PDF document text
    • https://flyingfish-stay.com/userfiles/file/xesaxowibatowe.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160927bb60d6e2---69216967113.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/ttkas8trp6rlot0g4lm3a1oqaa/81075036077.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba91afb2026---rudirogotosadeduvelo.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071075d2c0b2---6262909667.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/norenufeki.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/wurekolamuromipizozovi.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd83b7c6a9---sedadokij.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/9n7ghbgmndnm69esosr6bjp9g4/597022527.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8e1b76fc2---gaxekexajolikodijo.pdfIn PDF document text
    • http://greece-ex.com/images/blog//file/1081549130.pdfIn PDF document text
    • https://suksesunited.com/contents//files/gisutidozurokidofas.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607774d5b074f---vadoxiraromane.pdfIn PDF document text
    • https://kltccompany.com/ckfinder/userfiles/files/gizilobopazo.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/d13cc670ab224145089c0e36c8d9cd19/54027073631.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/a3df1cdfa619e1fe192fcccb405760b5/lofawomarokew.pdfIn PDF document text
    • http://cherryontop.pl/upload/fotki/file/64777150943.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/63cbe27b8dd2295a24585415841a3c63/39007213488.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/603c9e050808367ce8db2b1be0de38c6/98115842867.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/31bb9450c5e1e77a514eb406d30969a0/30649846303.pdfIn PDF document text
    • https://markeishahall.com/wp-content/plugins/super-forms/uploads/php/files/4f1bc23a573e199420b51f823b35dd1d/xijujesesur.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/xibenumuraxapa.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_off0000f690.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF690 11072 bytes
SHA-256: 5d52f148302b198f0645d4bed5962de1964b37ab8cc0ed77195977aca15c7d7e
font_01_sfnt_off00011071.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11071 17440 bytes
SHA-256: 3178a87bcb7783623022f6611ff231612a430e519760d0d39d0e2366f17e54da
font_02_sfnt_off00013e22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1