Malicious PDF — malware analysis report

Static analysis result for SHA-256 d378ab0a719021eb…

MALICIOUS

PDF

84.3 KB Created: 2021-09-07 14:45:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 507fccbd3dba4a2d749fe108e366a7f5 SHA-1: 1cba76e6ebd5cf1ed7d3bbbc090a9aa1c084f6de SHA-256: d378ab0a719021eb2669415bda3bbcfe56e6c50955d7b0ccfac3af9f1634d20e
96 Risk Score

Malware Insights

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

The ML classifier strongly indicates maliciousness. The PDF contains numerous links, many pointing to compromised WordPress sites and disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of 'utm_term' parameters in some URLs indicates a potential phishing or SEO poisoning campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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://coretry.ru/uplcv?utm_term=oxford+english+file+book+pdf PDF link annotation
    • http://xn--spreewaldpension-lbben-9lc.de/meineBilderAlbertGrundschule/file/1969698651.pdfIn PDF document text
    • http://canvangdientu.com/images/file/wotitapigumijavil.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16083fab51ce08---29988891387.pdfIn PDF document text
    • http://xycrusher.com/d/files/bimetodupuririsap.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5dcae499b---vakekomozumofidowupe.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160731c784796e---lugojejinesolagetu.pdfIn PDF document text
    • https://dm288.com/slicice/file/24277251003.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/83a4679f349a310578dee3326387831e/30832746245.pdfIn PDF document text
    • http://golfproradost.cz/webpagebuilder/ckfinder/userfiles/files/lirawagam.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b115fa8758e---xegiju.pdfIn PDF document text
    • http://globalquestconsulting.com/userfiles/files/32644240788.pdfIn PDF document text
    • http://pagyesa.org/userfiles/file/20210807105026.pdfIn PDF document text
    • http://hms31.ru/img/file/kogewesi.pdfIn PDF document text
    • http://geometrabottero.it/userfiles/files/bamazanumakuxopo.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdc96199a9---46934206084.pdfIn PDF document text
    • http://seanbittinger.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/53086354015.pdfIn PDF document text
    • http://connect-event.fr/ckfinder/userfiles/files/nurarolesatetozox.pdfIn PDF document text
    • http://nessium.fr/userfiles/file/7442311376.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/tukidoxivobadidiw.pdfIn PDF document text
    • https://matratva.in/userfiles/file/8740300318.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/7g25j46ue7ddtdpl0cv4t0da3q/biwijasaxamaw.pdfIn PDF document text
    • http://precisionsurgicalworks.com/alpha/ckfinder/userfiles/files/18925835182.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c3daa776c2e---72787398909.pdfIn PDF document text
    • http://wpscrm.in/uploaded_files/userfiles/files/35876477991.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_off0000e4a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A2 17820 bytes
SHA-256: 303a167a5d042c910a1d2f0df817b32b6aad54e746eb63c8a72005277fcb1bcd
font_01_sfnt_off000112b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012acf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ACF 10876 bytes
SHA-256: 1401d0ff27145357d51e6f818d2c39670cae638c5959049956ea96933f03bc41